12 results

Enhancement of saucer scallops (Amusium balloti) in Queensland and Western Australia - genetic considerations

Project number: 2003-033
Project Status:
Completed
Budget expenditure: $57,777.00
Principal Investigator: Paul J. Palmer
Organisation: Department of Primary Industries (QLD)
Project start/end date: 29 Jun 2003 - 30 Jun 2006
Contact:
FRDC

Need

Need for supporting and enabling biotechnologies:

The FRDC report highlighted the need for proper genetic management in scallop enhancement ventures (FRDC 2000/190) in particular citing the key issues of genetic resource management (Blankenship and Leber, 1997). This view is further supported by proceedings from the second international stock enhancement and sea ranching conference (Leber et al., 2002b)

Determining the genetic structure of the source population is essential baseline information to design an effective genetic management protocol for restocking ventures. Although, initial allozyme work indicates that the Queensland stocks are a single genetic population and are potentially a different species to the WA (Dredge et al unpubl; FRDC 2000/190), allozyme data is not effective in discerning local genetic populations whereas microsatellites are (Kolijonen et al., 2002). The information may also be used in future environmental monitoring of genetic diversity in wild populations by providing a genetic baseline for localized allelic frequencies and provide cross generational markers of hatchery stock.

The development of appropriate genetic management protocols at an early stage of a long-term proposal such as scallop ranching in Queensland or Western Australia is both desirable and responsible. Fisheries, conservation, public and other interests will undoubtedly, and appropriately, critically scrutinize the progress of the proposed operation. The development of appropriate and responsible genetic management protocols have been identified by QSS as being a critical short-term priority, and as such may have a significant bearing on the wider public acceptance of the operation.

The current Western Australian operation have also recognized genetic management as an important factor, although they are not undertaking such work. Our proposal, which is likely to include the WA operation at some level, would therefore directly benefit both states.

Kolijonen, M.-L., Tahtinen, J., Saisa, M. and Koskiniemi, J. 2002. Maintenance of genetic diversity of Atlantic salmon (Salmo salar) by captive breeding programmes and the geographic distribution of microsatellite variation. Aquaculture 212, 69-92.

Leber, K. M., Kitada, S., Blankenship, H. L. and Svaasand, T. (2002b). Proceedding from the Second International Symposium on Stock Enhancement and Sea Ranching, Kobe, Japan.

Objectives

1. Determine the genetic population structure of the wild stocks of Queensland and West Australian Amusium balloti (DNA based e.g. mitochondrial and microsatellite) i.e. whether the saucer scallops in WA and Qld are similar or different and whether there are differences within population along the coast.
2. Resolve taxonomic status of Australian Amusium scallops using molecular taxonomy i.e. are WA and Qld saucer scallops different species

Final report

Author: Paul Palmer
Final Report • 3.67 MB
2003-033-DLD.pdf

Summary

The saucer scallop, Amusium balloti, is distributed along the Western and Eastern coast of Australia and supports a fishery in both Queensland and Western Australia. Two commercial companies are investing in sea-ranching operations in an attempt to stabilise and increase annual catches. These operations are reliant upon hatchery production of juveniles because of species-specific constraints on open-water harvest of spat. The mass release of scallop juveniles is expected to have an immediate effect on population abundance, but it also has the potential to alter the genetic structure of the existing saucer scallop populations. Therefore, understanding and management of the genetic diversity is needed. 
 
Genetic diversity in a population or a species gives a range of genotypes that allows scope to adapt to environmental change, such as new diseases, new predators or competitors, or a change in climate. Loss of genetic diversity not only impacts on their capacity for adaptation but can also lead to potentially negative effects upon various performance traits such as survival and growth.
 
At this time, there is limited information available on the way genetic variation is spread throughout the saucer scallop populations. This project investigates the population genetic makeup of the east and west coast saucer scallops, which can give an insight into the reproductive interaction between populations and the identification of distinct stocks of scallops. 
 
Final Report • 3.67 MB
2003-033-DLD.pdf

Summary

The saucer scallop, Amusium balloti, is distributed along the Western and Eastern coast of Australia and supports a fishery in both Queensland and Western Australia. Two commercial companies are investing in sea-ranching operations in an attempt to stabilise and increase annual catches. These operations are reliant upon hatchery production of juveniles because of species-specific constraints on open-water harvest of spat. The mass release of scallop juveniles is expected to have an immediate effect on population abundance, but it also has the potential to alter the genetic structure of the existing saucer scallop populations. Therefore, understanding and management of the genetic diversity is needed. 
 
Genetic diversity in a population or a species gives a range of genotypes that allows scope to adapt to environmental change, such as new diseases, new predators or competitors, or a change in climate. Loss of genetic diversity not only impacts on their capacity for adaptation but can also lead to potentially negative effects upon various performance traits such as survival and growth.
 
At this time, there is limited information available on the way genetic variation is spread throughout the saucer scallop populations. This project investigates the population genetic makeup of the east and west coast saucer scallops, which can give an insight into the reproductive interaction between populations and the identification of distinct stocks of scallops. 
 
Final Report • 3.67 MB
2003-033-DLD.pdf

Summary

The saucer scallop, Amusium balloti, is distributed along the Western and Eastern coast of Australia and supports a fishery in both Queensland and Western Australia. Two commercial companies are investing in sea-ranching operations in an attempt to stabilise and increase annual catches. These operations are reliant upon hatchery production of juveniles because of species-specific constraints on open-water harvest of spat. The mass release of scallop juveniles is expected to have an immediate effect on population abundance, but it also has the potential to alter the genetic structure of the existing saucer scallop populations. Therefore, understanding and management of the genetic diversity is needed. 
 
Genetic diversity in a population or a species gives a range of genotypes that allows scope to adapt to environmental change, such as new diseases, new predators or competitors, or a change in climate. Loss of genetic diversity not only impacts on their capacity for adaptation but can also lead to potentially negative effects upon various performance traits such as survival and growth.
 
At this time, there is limited information available on the way genetic variation is spread throughout the saucer scallop populations. This project investigates the population genetic makeup of the east and west coast saucer scallops, which can give an insight into the reproductive interaction between populations and the identification of distinct stocks of scallops. 
 
Final Report • 3.67 MB
2003-033-DLD.pdf

Summary

The saucer scallop, Amusium balloti, is distributed along the Western and Eastern coast of Australia and supports a fishery in both Queensland and Western Australia. Two commercial companies are investing in sea-ranching operations in an attempt to stabilise and increase annual catches. These operations are reliant upon hatchery production of juveniles because of species-specific constraints on open-water harvest of spat. The mass release of scallop juveniles is expected to have an immediate effect on population abundance, but it also has the potential to alter the genetic structure of the existing saucer scallop populations. Therefore, understanding and management of the genetic diversity is needed. 
 
Genetic diversity in a population or a species gives a range of genotypes that allows scope to adapt to environmental change, such as new diseases, new predators or competitors, or a change in climate. Loss of genetic diversity not only impacts on their capacity for adaptation but can also lead to potentially negative effects upon various performance traits such as survival and growth.
 
At this time, there is limited information available on the way genetic variation is spread throughout the saucer scallop populations. This project investigates the population genetic makeup of the east and west coast saucer scallops, which can give an insight into the reproductive interaction between populations and the identification of distinct stocks of scallops. 
 
Final Report • 3.67 MB
2003-033-DLD.pdf

Summary

The saucer scallop, Amusium balloti, is distributed along the Western and Eastern coast of Australia and supports a fishery in both Queensland and Western Australia. Two commercial companies are investing in sea-ranching operations in an attempt to stabilise and increase annual catches. These operations are reliant upon hatchery production of juveniles because of species-specific constraints on open-water harvest of spat. The mass release of scallop juveniles is expected to have an immediate effect on population abundance, but it also has the potential to alter the genetic structure of the existing saucer scallop populations. Therefore, understanding and management of the genetic diversity is needed. 
 
Genetic diversity in a population or a species gives a range of genotypes that allows scope to adapt to environmental change, such as new diseases, new predators or competitors, or a change in climate. Loss of genetic diversity not only impacts on their capacity for adaptation but can also lead to potentially negative effects upon various performance traits such as survival and growth.
 
At this time, there is limited information available on the way genetic variation is spread throughout the saucer scallop populations. This project investigates the population genetic makeup of the east and west coast saucer scallops, which can give an insight into the reproductive interaction between populations and the identification of distinct stocks of scallops. 
 
Final Report • 3.67 MB
2003-033-DLD.pdf

Summary

The saucer scallop, Amusium balloti, is distributed along the Western and Eastern coast of Australia and supports a fishery in both Queensland and Western Australia. Two commercial companies are investing in sea-ranching operations in an attempt to stabilise and increase annual catches. These operations are reliant upon hatchery production of juveniles because of species-specific constraints on open-water harvest of spat. The mass release of scallop juveniles is expected to have an immediate effect on population abundance, but it also has the potential to alter the genetic structure of the existing saucer scallop populations. Therefore, understanding and management of the genetic diversity is needed. 
 
Genetic diversity in a population or a species gives a range of genotypes that allows scope to adapt to environmental change, such as new diseases, new predators or competitors, or a change in climate. Loss of genetic diversity not only impacts on their capacity for adaptation but can also lead to potentially negative effects upon various performance traits such as survival and growth.
 
At this time, there is limited information available on the way genetic variation is spread throughout the saucer scallop populations. This project investigates the population genetic makeup of the east and west coast saucer scallops, which can give an insight into the reproductive interaction between populations and the identification of distinct stocks of scallops. 
 
Final Report • 3.67 MB
2003-033-DLD.pdf

Summary

The saucer scallop, Amusium balloti, is distributed along the Western and Eastern coast of Australia and supports a fishery in both Queensland and Western Australia. Two commercial companies are investing in sea-ranching operations in an attempt to stabilise and increase annual catches. These operations are reliant upon hatchery production of juveniles because of species-specific constraints on open-water harvest of spat. The mass release of scallop juveniles is expected to have an immediate effect on population abundance, but it also has the potential to alter the genetic structure of the existing saucer scallop populations. Therefore, understanding and management of the genetic diversity is needed. 
 
Genetic diversity in a population or a species gives a range of genotypes that allows scope to adapt to environmental change, such as new diseases, new predators or competitors, or a change in climate. Loss of genetic diversity not only impacts on their capacity for adaptation but can also lead to potentially negative effects upon various performance traits such as survival and growth.
 
At this time, there is limited information available on the way genetic variation is spread throughout the saucer scallop populations. This project investigates the population genetic makeup of the east and west coast saucer scallops, which can give an insight into the reproductive interaction between populations and the identification of distinct stocks of scallops. 
 
Final Report • 3.67 MB
2003-033-DLD.pdf

Summary

The saucer scallop, Amusium balloti, is distributed along the Western and Eastern coast of Australia and supports a fishery in both Queensland and Western Australia. Two commercial companies are investing in sea-ranching operations in an attempt to stabilise and increase annual catches. These operations are reliant upon hatchery production of juveniles because of species-specific constraints on open-water harvest of spat. The mass release of scallop juveniles is expected to have an immediate effect on population abundance, but it also has the potential to alter the genetic structure of the existing saucer scallop populations. Therefore, understanding and management of the genetic diversity is needed. 
 
Genetic diversity in a population or a species gives a range of genotypes that allows scope to adapt to environmental change, such as new diseases, new predators or competitors, or a change in climate. Loss of genetic diversity not only impacts on their capacity for adaptation but can also lead to potentially negative effects upon various performance traits such as survival and growth.
 
At this time, there is limited information available on the way genetic variation is spread throughout the saucer scallop populations. This project investigates the population genetic makeup of the east and west coast saucer scallops, which can give an insight into the reproductive interaction between populations and the identification of distinct stocks of scallops. 
 
Final Report • 3.67 MB
2003-033-DLD.pdf

Summary

The saucer scallop, Amusium balloti, is distributed along the Western and Eastern coast of Australia and supports a fishery in both Queensland and Western Australia. Two commercial companies are investing in sea-ranching operations in an attempt to stabilise and increase annual catches. These operations are reliant upon hatchery production of juveniles because of species-specific constraints on open-water harvest of spat. The mass release of scallop juveniles is expected to have an immediate effect on population abundance, but it also has the potential to alter the genetic structure of the existing saucer scallop populations. Therefore, understanding and management of the genetic diversity is needed. 
 
Genetic diversity in a population or a species gives a range of genotypes that allows scope to adapt to environmental change, such as new diseases, new predators or competitors, or a change in climate. Loss of genetic diversity not only impacts on their capacity for adaptation but can also lead to potentially negative effects upon various performance traits such as survival and growth.
 
At this time, there is limited information available on the way genetic variation is spread throughout the saucer scallop populations. This project investigates the population genetic makeup of the east and west coast saucer scallops, which can give an insight into the reproductive interaction between populations and the identification of distinct stocks of scallops. 
 
Final Report • 3.67 MB
2003-033-DLD.pdf

Summary

The saucer scallop, Amusium balloti, is distributed along the Western and Eastern coast of Australia and supports a fishery in both Queensland and Western Australia. Two commercial companies are investing in sea-ranching operations in an attempt to stabilise and increase annual catches. These operations are reliant upon hatchery production of juveniles because of species-specific constraints on open-water harvest of spat. The mass release of scallop juveniles is expected to have an immediate effect on population abundance, but it also has the potential to alter the genetic structure of the existing saucer scallop populations. Therefore, understanding and management of the genetic diversity is needed. 
 
Genetic diversity in a population or a species gives a range of genotypes that allows scope to adapt to environmental change, such as new diseases, new predators or competitors, or a change in climate. Loss of genetic diversity not only impacts on their capacity for adaptation but can also lead to potentially negative effects upon various performance traits such as survival and growth.
 
At this time, there is limited information available on the way genetic variation is spread throughout the saucer scallop populations. This project investigates the population genetic makeup of the east and west coast saucer scallops, which can give an insight into the reproductive interaction between populations and the identification of distinct stocks of scallops. 
 
Final Report • 3.67 MB
2003-033-DLD.pdf

Summary

The saucer scallop, Amusium balloti, is distributed along the Western and Eastern coast of Australia and supports a fishery in both Queensland and Western Australia. Two commercial companies are investing in sea-ranching operations in an attempt to stabilise and increase annual catches. These operations are reliant upon hatchery production of juveniles because of species-specific constraints on open-water harvest of spat. The mass release of scallop juveniles is expected to have an immediate effect on population abundance, but it also has the potential to alter the genetic structure of the existing saucer scallop populations. Therefore, understanding and management of the genetic diversity is needed. 
 
Genetic diversity in a population or a species gives a range of genotypes that allows scope to adapt to environmental change, such as new diseases, new predators or competitors, or a change in climate. Loss of genetic diversity not only impacts on their capacity for adaptation but can also lead to potentially negative effects upon various performance traits such as survival and growth.
 
At this time, there is limited information available on the way genetic variation is spread throughout the saucer scallop populations. This project investigates the population genetic makeup of the east and west coast saucer scallops, which can give an insight into the reproductive interaction between populations and the identification of distinct stocks of scallops. 
 

Extending the high quality shelf life of scallop products - modified atmosphere packaging trials

Project number: 1998-482
Project Status:
Completed
Budget expenditure: $3,445.00
Principal Investigator: Steve L. Slattery
Organisation: Department of Primary Industries (QLD)
Project start/end date: 28 Sep 1998 - 25 May 2000
Contact:
FRDC

Objectives

1. Establish commercial production and market acceptance of a modified atmosphere packaged scallop. The report will contain the quality data obtained from raw material evaluation and the shelf life trial.

Final report

Author: Steven Slattery
Final Report • 2000-11-16 • 880.02 KB
1998-482-DLD.pdf

Summary

The aim of the project was to establish commercial production and market acceptance of modified atmosphere packaged scallops.  This report contains the quality data obtained from raw material evaluation and the shelf life trial.  The results of a market trial has been compiled by Fishmac staff.

The microbiological quality of scallops from the supply boats was assessed.  A total plate count of less than 10,000 cfu/g for the raw material was required before the scallop could be packed into individual trays, vacuum ski n packed using gas permeable film.  The packs were placed into a master carton and flushed with 100% carbon dioxide and sealed.  The shelf life of the scallops was determined by testing for a number of microbiological and sensory criteria.  When the shelf life had been determined scallops were packed in MAP and sent to buyers for appraisal.  Feedback was requested from these individuals about the quality of the product.

A high bacterial load present in product from some supply vessels indicated that a qual ity assurance program and additional steps in the processing operation are required to ensure consistently low bacterial counts.  The scallops packaged for the marketing trial had very high counts which could not be identified until several days after pack aging.  Because of this the packs were not exported to overseas buyers.  Fishmac is currently trialing a food grade chemical treatment that will assure suitable bacteriological quality of the raw material.  When this process becomes part of normal producti on the quality of all the scallops processed by this factory will be suitable for MAP.

The feasibility of using “frozen at sea” scallops in modified atmosphere packs (MAP) has been proven.  The shelf -life extension achieved was similar to that observed wh en fresh unfrozen scallops were used in MAP.  The extended shelf life gained through the application of MAP will allo w this company to export fresh chilled scallops to any country in the world.

Final Report • 2000-11-16 • 880.02 KB
1998-482-DLD.pdf

Summary

The aim of the project was to establish commercial production and market acceptance of modified atmosphere packaged scallops.  This report contains the quality data obtained from raw material evaluation and the shelf life trial.  The results of a market trial has been compiled by Fishmac staff.

The microbiological quality of scallops from the supply boats was assessed.  A total plate count of less than 10,000 cfu/g for the raw material was required before the scallop could be packed into individual trays, vacuum ski n packed using gas permeable film.  The packs were placed into a master carton and flushed with 100% carbon dioxide and sealed.  The shelf life of the scallops was determined by testing for a number of microbiological and sensory criteria.  When the shelf life had been determined scallops were packed in MAP and sent to buyers for appraisal.  Feedback was requested from these individuals about the quality of the product.

A high bacterial load present in product from some supply vessels indicated that a qual ity assurance program and additional steps in the processing operation are required to ensure consistently low bacterial counts.  The scallops packaged for the marketing trial had very high counts which could not be identified until several days after pack aging.  Because of this the packs were not exported to overseas buyers.  Fishmac is currently trialing a food grade chemical treatment that will assure suitable bacteriological quality of the raw material.  When this process becomes part of normal producti on the quality of all the scallops processed by this factory will be suitable for MAP.

The feasibility of using “frozen at sea” scallops in modified atmosphere packs (MAP) has been proven.  The shelf -life extension achieved was similar to that observed wh en fresh unfrozen scallops were used in MAP.  The extended shelf life gained through the application of MAP will allo w this company to export fresh chilled scallops to any country in the world.

Final Report • 2000-11-16 • 880.02 KB
1998-482-DLD.pdf

Summary

The aim of the project was to establish commercial production and market acceptance of modified atmosphere packaged scallops.  This report contains the quality data obtained from raw material evaluation and the shelf life trial.  The results of a market trial has been compiled by Fishmac staff.

The microbiological quality of scallops from the supply boats was assessed.  A total plate count of less than 10,000 cfu/g for the raw material was required before the scallop could be packed into individual trays, vacuum ski n packed using gas permeable film.  The packs were placed into a master carton and flushed with 100% carbon dioxide and sealed.  The shelf life of the scallops was determined by testing for a number of microbiological and sensory criteria.  When the shelf life had been determined scallops were packed in MAP and sent to buyers for appraisal.  Feedback was requested from these individuals about the quality of the product.

A high bacterial load present in product from some supply vessels indicated that a qual ity assurance program and additional steps in the processing operation are required to ensure consistently low bacterial counts.  The scallops packaged for the marketing trial had very high counts which could not be identified until several days after pack aging.  Because of this the packs were not exported to overseas buyers.  Fishmac is currently trialing a food grade chemical treatment that will assure suitable bacteriological quality of the raw material.  When this process becomes part of normal producti on the quality of all the scallops processed by this factory will be suitable for MAP.

The feasibility of using “frozen at sea” scallops in modified atmosphere packs (MAP) has been proven.  The shelf -life extension achieved was similar to that observed wh en fresh unfrozen scallops were used in MAP.  The extended shelf life gained through the application of MAP will allo w this company to export fresh chilled scallops to any country in the world.

Final Report • 2000-11-16 • 880.02 KB
1998-482-DLD.pdf

Summary

The aim of the project was to establish commercial production and market acceptance of modified atmosphere packaged scallops.  This report contains the quality data obtained from raw material evaluation and the shelf life trial.  The results of a market trial has been compiled by Fishmac staff.

The microbiological quality of scallops from the supply boats was assessed.  A total plate count of less than 10,000 cfu/g for the raw material was required before the scallop could be packed into individual trays, vacuum ski n packed using gas permeable film.  The packs were placed into a master carton and flushed with 100% carbon dioxide and sealed.  The shelf life of the scallops was determined by testing for a number of microbiological and sensory criteria.  When the shelf life had been determined scallops were packed in MAP and sent to buyers for appraisal.  Feedback was requested from these individuals about the quality of the product.

A high bacterial load present in product from some supply vessels indicated that a qual ity assurance program and additional steps in the processing operation are required to ensure consistently low bacterial counts.  The scallops packaged for the marketing trial had very high counts which could not be identified until several days after pack aging.  Because of this the packs were not exported to overseas buyers.  Fishmac is currently trialing a food grade chemical treatment that will assure suitable bacteriological quality of the raw material.  When this process becomes part of normal producti on the quality of all the scallops processed by this factory will be suitable for MAP.

The feasibility of using “frozen at sea” scallops in modified atmosphere packs (MAP) has been proven.  The shelf -life extension achieved was similar to that observed wh en fresh unfrozen scallops were used in MAP.  The extended shelf life gained through the application of MAP will allo w this company to export fresh chilled scallops to any country in the world.

Final Report • 2000-11-16 • 880.02 KB
1998-482-DLD.pdf

Summary

The aim of the project was to establish commercial production and market acceptance of modified atmosphere packaged scallops.  This report contains the quality data obtained from raw material evaluation and the shelf life trial.  The results of a market trial has been compiled by Fishmac staff.

The microbiological quality of scallops from the supply boats was assessed.  A total plate count of less than 10,000 cfu/g for the raw material was required before the scallop could be packed into individual trays, vacuum ski n packed using gas permeable film.  The packs were placed into a master carton and flushed with 100% carbon dioxide and sealed.  The shelf life of the scallops was determined by testing for a number of microbiological and sensory criteria.  When the shelf life had been determined scallops were packed in MAP and sent to buyers for appraisal.  Feedback was requested from these individuals about the quality of the product.

A high bacterial load present in product from some supply vessels indicated that a qual ity assurance program and additional steps in the processing operation are required to ensure consistently low bacterial counts.  The scallops packaged for the marketing trial had very high counts which could not be identified until several days after pack aging.  Because of this the packs were not exported to overseas buyers.  Fishmac is currently trialing a food grade chemical treatment that will assure suitable bacteriological quality of the raw material.  When this process becomes part of normal producti on the quality of all the scallops processed by this factory will be suitable for MAP.

The feasibility of using “frozen at sea” scallops in modified atmosphere packs (MAP) has been proven.  The shelf -life extension achieved was similar to that observed wh en fresh unfrozen scallops were used in MAP.  The extended shelf life gained through the application of MAP will allo w this company to export fresh chilled scallops to any country in the world.

Final Report • 2000-11-16 • 880.02 KB
1998-482-DLD.pdf

Summary

The aim of the project was to establish commercial production and market acceptance of modified atmosphere packaged scallops.  This report contains the quality data obtained from raw material evaluation and the shelf life trial.  The results of a market trial has been compiled by Fishmac staff.

The microbiological quality of scallops from the supply boats was assessed.  A total plate count of less than 10,000 cfu/g for the raw material was required before the scallop could be packed into individual trays, vacuum ski n packed using gas permeable film.  The packs were placed into a master carton and flushed with 100% carbon dioxide and sealed.  The shelf life of the scallops was determined by testing for a number of microbiological and sensory criteria.  When the shelf life had been determined scallops were packed in MAP and sent to buyers for appraisal.  Feedback was requested from these individuals about the quality of the product.

A high bacterial load present in product from some supply vessels indicated that a qual ity assurance program and additional steps in the processing operation are required to ensure consistently low bacterial counts.  The scallops packaged for the marketing trial had very high counts which could not be identified until several days after pack aging.  Because of this the packs were not exported to overseas buyers.  Fishmac is currently trialing a food grade chemical treatment that will assure suitable bacteriological quality of the raw material.  When this process becomes part of normal producti on the quality of all the scallops processed by this factory will be suitable for MAP.

The feasibility of using “frozen at sea” scallops in modified atmosphere packs (MAP) has been proven.  The shelf -life extension achieved was similar to that observed wh en fresh unfrozen scallops were used in MAP.  The extended shelf life gained through the application of MAP will allo w this company to export fresh chilled scallops to any country in the world.

Final Report • 2000-11-16 • 880.02 KB
1998-482-DLD.pdf

Summary

The aim of the project was to establish commercial production and market acceptance of modified atmosphere packaged scallops.  This report contains the quality data obtained from raw material evaluation and the shelf life trial.  The results of a market trial has been compiled by Fishmac staff.

The microbiological quality of scallops from the supply boats was assessed.  A total plate count of less than 10,000 cfu/g for the raw material was required before the scallop could be packed into individual trays, vacuum ski n packed using gas permeable film.  The packs were placed into a master carton and flushed with 100% carbon dioxide and sealed.  The shelf life of the scallops was determined by testing for a number of microbiological and sensory criteria.  When the shelf life had been determined scallops were packed in MAP and sent to buyers for appraisal.  Feedback was requested from these individuals about the quality of the product.

A high bacterial load present in product from some supply vessels indicated that a qual ity assurance program and additional steps in the processing operation are required to ensure consistently low bacterial counts.  The scallops packaged for the marketing trial had very high counts which could not be identified until several days after pack aging.  Because of this the packs were not exported to overseas buyers.  Fishmac is currently trialing a food grade chemical treatment that will assure suitable bacteriological quality of the raw material.  When this process becomes part of normal producti on the quality of all the scallops processed by this factory will be suitable for MAP.

The feasibility of using “frozen at sea” scallops in modified atmosphere packs (MAP) has been proven.  The shelf -life extension achieved was similar to that observed wh en fresh unfrozen scallops were used in MAP.  The extended shelf life gained through the application of MAP will allo w this company to export fresh chilled scallops to any country in the world.

Final Report • 2000-11-16 • 880.02 KB
1998-482-DLD.pdf

Summary

The aim of the project was to establish commercial production and market acceptance of modified atmosphere packaged scallops.  This report contains the quality data obtained from raw material evaluation and the shelf life trial.  The results of a market trial has been compiled by Fishmac staff.

The microbiological quality of scallops from the supply boats was assessed.  A total plate count of less than 10,000 cfu/g for the raw material was required before the scallop could be packed into individual trays, vacuum ski n packed using gas permeable film.  The packs were placed into a master carton and flushed with 100% carbon dioxide and sealed.  The shelf life of the scallops was determined by testing for a number of microbiological and sensory criteria.  When the shelf life had been determined scallops were packed in MAP and sent to buyers for appraisal.  Feedback was requested from these individuals about the quality of the product.

A high bacterial load present in product from some supply vessels indicated that a qual ity assurance program and additional steps in the processing operation are required to ensure consistently low bacterial counts.  The scallops packaged for the marketing trial had very high counts which could not be identified until several days after pack aging.  Because of this the packs were not exported to overseas buyers.  Fishmac is currently trialing a food grade chemical treatment that will assure suitable bacteriological quality of the raw material.  When this process becomes part of normal producti on the quality of all the scallops processed by this factory will be suitable for MAP.

The feasibility of using “frozen at sea” scallops in modified atmosphere packs (MAP) has been proven.  The shelf -life extension achieved was similar to that observed wh en fresh unfrozen scallops were used in MAP.  The extended shelf life gained through the application of MAP will allo w this company to export fresh chilled scallops to any country in the world.

Final Report • 2000-11-16 • 880.02 KB
1998-482-DLD.pdf

Summary

The aim of the project was to establish commercial production and market acceptance of modified atmosphere packaged scallops.  This report contains the quality data obtained from raw material evaluation and the shelf life trial.  The results of a market trial has been compiled by Fishmac staff.

The microbiological quality of scallops from the supply boats was assessed.  A total plate count of less than 10,000 cfu/g for the raw material was required before the scallop could be packed into individual trays, vacuum ski n packed using gas permeable film.  The packs were placed into a master carton and flushed with 100% carbon dioxide and sealed.  The shelf life of the scallops was determined by testing for a number of microbiological and sensory criteria.  When the shelf life had been determined scallops were packed in MAP and sent to buyers for appraisal.  Feedback was requested from these individuals about the quality of the product.

A high bacterial load present in product from some supply vessels indicated that a qual ity assurance program and additional steps in the processing operation are required to ensure consistently low bacterial counts.  The scallops packaged for the marketing trial had very high counts which could not be identified until several days after pack aging.  Because of this the packs were not exported to overseas buyers.  Fishmac is currently trialing a food grade chemical treatment that will assure suitable bacteriological quality of the raw material.  When this process becomes part of normal producti on the quality of all the scallops processed by this factory will be suitable for MAP.

The feasibility of using “frozen at sea” scallops in modified atmosphere packs (MAP) has been proven.  The shelf -life extension achieved was similar to that observed wh en fresh unfrozen scallops were used in MAP.  The extended shelf life gained through the application of MAP will allo w this company to export fresh chilled scallops to any country in the world.

Final Report • 2000-11-16 • 880.02 KB
1998-482-DLD.pdf

Summary

The aim of the project was to establish commercial production and market acceptance of modified atmosphere packaged scallops.  This report contains the quality data obtained from raw material evaluation and the shelf life trial.  The results of a market trial has been compiled by Fishmac staff.

The microbiological quality of scallops from the supply boats was assessed.  A total plate count of less than 10,000 cfu/g for the raw material was required before the scallop could be packed into individual trays, vacuum ski n packed using gas permeable film.  The packs were placed into a master carton and flushed with 100% carbon dioxide and sealed.  The shelf life of the scallops was determined by testing for a number of microbiological and sensory criteria.  When the shelf life had been determined scallops were packed in MAP and sent to buyers for appraisal.  Feedback was requested from these individuals about the quality of the product.

A high bacterial load present in product from some supply vessels indicated that a qual ity assurance program and additional steps in the processing operation are required to ensure consistently low bacterial counts.  The scallops packaged for the marketing trial had very high counts which could not be identified until several days after pack aging.  Because of this the packs were not exported to overseas buyers.  Fishmac is currently trialing a food grade chemical treatment that will assure suitable bacteriological quality of the raw material.  When this process becomes part of normal producti on the quality of all the scallops processed by this factory will be suitable for MAP.

The feasibility of using “frozen at sea” scallops in modified atmosphere packs (MAP) has been proven.  The shelf -life extension achieved was similar to that observed wh en fresh unfrozen scallops were used in MAP.  The extended shelf life gained through the application of MAP will allo w this company to export fresh chilled scallops to any country in the world.

Final Report • 2000-11-16 • 880.02 KB
1998-482-DLD.pdf

Summary

The aim of the project was to establish commercial production and market acceptance of modified atmosphere packaged scallops.  This report contains the quality data obtained from raw material evaluation and the shelf life trial.  The results of a market trial has been compiled by Fishmac staff.

The microbiological quality of scallops from the supply boats was assessed.  A total plate count of less than 10,000 cfu/g for the raw material was required before the scallop could be packed into individual trays, vacuum ski n packed using gas permeable film.  The packs were placed into a master carton and flushed with 100% carbon dioxide and sealed.  The shelf life of the scallops was determined by testing for a number of microbiological and sensory criteria.  When the shelf life had been determined scallops were packed in MAP and sent to buyers for appraisal.  Feedback was requested from these individuals about the quality of the product.

A high bacterial load present in product from some supply vessels indicated that a qual ity assurance program and additional steps in the processing operation are required to ensure consistently low bacterial counts.  The scallops packaged for the marketing trial had very high counts which could not be identified until several days after pack aging.  Because of this the packs were not exported to overseas buyers.  Fishmac is currently trialing a food grade chemical treatment that will assure suitable bacteriological quality of the raw material.  When this process becomes part of normal producti on the quality of all the scallops processed by this factory will be suitable for MAP.

The feasibility of using “frozen at sea” scallops in modified atmosphere packs (MAP) has been proven.  The shelf -life extension achieved was similar to that observed wh en fresh unfrozen scallops were used in MAP.  The extended shelf life gained through the application of MAP will allo w this company to export fresh chilled scallops to any country in the world.

Marking scallops for release and recapture

Project number: 2005-016
Project Status:
Completed
Budget expenditure: $40,000.00
Principal Investigator: Paul J. Palmer
Organisation: Department of Primary Industries (QLD)
Project start/end date: 30 Aug 2005 - 30 Jun 2008
Contact:
FRDC

Need

The ability to distinguish hatchery-produced scallops from wild recruits is necessary to determine the survival and optimal size and time of deployment to the seabed in the scallop reseeding project FRDC 2002/48. Furthermore, to enable rigorous evaluation of commercial marine reseeding ventures, a means of identifying the released scallops upon recapture is required. Successful labelling of juvenile scallops will also allow researchers to estimate survival and dispersal of reseeded juveniles.

An identifying mark provides far greater sensitivity and accuracy than typical statistical-based assessment. There are a number of reported methods to discern hatchery produced animals but the methods we have chosen to test are relatively inexpensive and easy to apply to animals no greater than 4mm shell length (commercial release size). An alternative marking method, molecular analysis of scallop tissue, was evaluated and qualified opinions sought, but rejected on the basis of high expense and processing time compared with testing cheaper alternatives with demonstrated utility in other species.

Objectives

1. To develop a method to mark hatchery reared saucer scallops to distinguish them from animals derived from wild populations.

Final report

Harvest strategy evaluation to optimise the sustainability and value of the Queensland scallop fishery

Project number: 2006-024
Project Status:
Completed
Budget expenditure: $412,078.00
Principal Investigator: Matthew J. Campbell
Organisation: Department of Primary Industries (QLD)
Project start/end date: 29 Sep 2006 - 30 Jun 2009
Contact:
FRDC

Need

1. Need to evaluate current management measures

There is a need to evaluate the current management measures applied to the scallop fishery, particularly the range of minimum legal sizes, the effects of the southern closure and the rotational closures. Precisely what are these measures achieving and are they effective? Can the value of the resource be increased with alternative management measures, within the constraints of acceptable risks of overfishing? One of QFIRAC's priorities is to look at the scallop fishery and in particular the value of protected areas, sources of mortality and stock structure.

2. Need to determine discard mortality and growth by region

Some processors are requesting DPI&F abandon the rotational spawning stock closures and lower the minimum legal size of scallops with the intention of increasing the amount of scallops fishers can retain and market. To consider any of these changes in management that could possibly lead to overfishing it is imperative that we have precise estimates of key stock assessment parameters including gear selectivity, and discard mortality.

3. Need to measure fine-scale trawl intensity

The frequency with which discarded scallops are recaptured over time and space may impact on estimates of discard mortality. Using the VMS trawl track database the frequency with which an area is trawled will be determined to guide subsequent discard mortality experiments.

Objectives

1. Measure spatial and temporal trawl frequency of scallop grounds using VMS data. This will provide a relative measure of how often individual undersized scallops are caught and put through a tumbler
2. Estimate discard mortality and growth rates for saucer scallops using cage experiments.
3. Evaluate the current management measures, in particular the seasonal closure, rotational closure and seasonally varying minimum legal sizes using stock assessment and management modeling models. Recommend optimal range of management measures to ensure long-term viability and value of the Scallop fishery based on a formal management strategy evaluation.

Final report

ISBN: 978-0-7345-0416-6
Author: Matthew Campbell
Industry
PROJECT NUMBER • 2017-057
PROJECT STATUS:
COMPLETED

Stock predictions and spatial population indicators for Australia's east coast saucer scallop fishery

This project undertook analyses to understand the role of overfishing and the environment on saucer scallops. The analyses indicated reduced numbers of spawning scallops. Historical levels of fishing and environmental influences such as from increased sea surface temperatures (SST) have amplified...
ORGANISATION:
Department of Primary Industries (QLD)
View Filter

Research