27,918 results

Enhancement of ship-board survivorship of coral trout destined for the live fish market

Project number: 1997-341
Project Status:
Completed
Budget expenditure: $280,904.51
Principal Investigator: Trevor Andersen
Organisation: James Cook University (JCU)
Project start/end date: 21 Jun 1997 - 14 Jan 2004
Contact:
FRDC
TAGS
Mortality
Market Opportunities
Food Safety
Fisheries Management

Need

The live Coral Trout fishery is currently conservatively valued at $3.5 million. Demand for live Coral Trout is not being met and it is clear that the market could accept additional product. Anecdotal information also indicates that competing countries supplying the 14000T live tropical fish market in Hong Kong are suffering from over-fishing and demand is expected to further increase as a result.

A major limitation preventing the live Coral Trout industry expanding to fill the available market is the mortality due to injury and disease. Although developments in technology and skill level have occurred in the last 12 months, these developments are not industry wide and are generally specific to particular (eg very large) vessels. Most boats are presently restricted to a maximum of 5 to 6 days at sea as they are unable to hold the fish live for longer. In addition, although mortality of live fish may be as low as 2% from processor to market, mortality between capture and transfer to processors may reach 50% at some times of the year. Whilst current practice means that fish showing imminent sign of death are sacrificed to obtain fillet, this results in significant devaluing of the product. This leakage of product from the high value live market (@ $35+/kg) to the fillet market (+ $14+/kg) results in significant loss of value in this fishery with loss of income to all sectors of the industry.

The adoption of strategies to target the live trout, rather than the fresh frozen fillet, market also results in reduced total catch per boat due to the significant price advantage and larger on-board facilities required to hold the product. By providing information that will allow a code of practice to achieve World Best Practice, information that is not currently available for coral trout, this project that will facilitate the movement of boats into the live fishery. It is likely that the total catch will be reduced and the long-term sustainability of the fishery will be enhanced.

Objectives

1. To increase fish survival in the live coral trout fishery.
2. To identify practices in the harvest, ship-board transport and holding of live coral trout that are the major stressors.
3. To identify the impact of these stressors on survival and disease resistance.
4. To develop benchmark practices for the harvesting, ship-board transport and holding of live coral trout that alleviate the stressors and improve survival.
5. To inform the industry and management of the benchmark practices.
6. To assist with the implementation and to evaluate the implementation of benchmark practices in the live trout industry

Final report

ISBN: 0-86443-702-1
Author: Trevor Anderson
Final Report • 2003-09-25 • 1.21 MB
1997-341-DLD.pdf
Industry
PROJECT NUMBER • 1994-005
PROJECT STATUS:
COMPLETED

The feasibility of enhancing and rehabilitating abalone stocks by larval re-seeding

The decline of many of the world's fisheries has stimulated interest in the enhancement of stocks by using cultured animals. Enhancement of abalone stocks with cultured Juveniles has been practiced for some time (in Japan in particular), but the high cost of rearing juveniles or the high mortality...
ORGANISATION:
SARDI Food Safety and Innovation
TAGS
Stock Assessment
Reproduction
Mortality
Industry
PROJECT NUMBER • 2016-800
PROJECT STATUS:
COMPLETED

Future Oysters CRC-P Management and Extension

The Future Oysters CRC-P project (CRC-P 2016-553805; Future Oysters) was funded by the Australian Government’s Business Cooperative Research Centres (CRC) Program, which is managed by the Department of Industry, Innovation and Science (DIIS). The Future Oysters CRC-P project was developed to...
ORGANISATION:
Australian Seafood Industries Pty Ltd (ASI)
TAGS
Mortality
Disease
Aquaculture
SPECIES
Sydney Rock Oyster
Native Oyster
Pacific Oyster

Selective breeding for disease resistance and fast growth in Sydney rock oysters

Project number: 1996-357
Project Status:
Completed
Budget expenditure: $332,308.00
Principal Investigator: John Nell
Organisation: Department of Primary Industries and Regional Development (NSW)
Project start/end date: 27 Feb 1997 - 18 Mar 2004
Contact:
FRDC
TAGS
Reproduction
Husbandry
Fisheries Management
Disease
Biosecurity

Need

The NSW oyster industry has suffered from QX disease and winter mortality for a very long time. It has responded to these disease challenges by vacating affected leases seasonally or in the case of Georges River by abondoning the infested part of the estuary. The history of inter-estuary transfer of oysters for on-growing has not allowed the development of resistant strains in NSW. However, if resistant strains of oysters are not developed, the industry will have no better management tool available in future than that used in the past, ie moving or selling oysters before a disease outbreak is expected or abondoning oyster leases.

If the opportunity for breeding QX disease resistance in Sydney rock oysters is not taken up, a unique opportunity will be lost, to use breeding lines previously selected for fast growth in the selection for disease resistance. It is important that breeding for QX resistance begins now, before another estuary is infested with this parasite. In Georges River, the industry responded to the QX outbreak by abandoning affected leases.

Growth rates in Sydney rock oysters have been improved by an average of 4% for the first generation of selection in Port Stephens. Now the initial progress has been made and four breeding lines are established, it is important that the momentum is maintained and selective breeding for fast growth is continued. The growth rate of the Port Stephens selection lines can be increased by 4% for each successive generation.

Growth rates in Sydney rock oysters can be improved by both selective breeding (an average of 4% faster growth for the first generation of selection) and triploidy (30-40% faster growth). However, triploids have not previously been produced from improved breeding lines. It is important to determine if improvements in growth rates by these two methods are additive. For example with triploids produced from improved breeding lines, a 30% increase in growth rate with triploidy plus another 8% for two generations of selective breeding may increase growth rates of oysters by 38%.

Objectives

1. Evaluation of the resistance of fourth selected generation Georges River oysters to QX disease and winter mortality against controls
2. Evaluation of the growth rate of fourth selected generation Port Stephens selection line diploids and triploids against non-selected diploid and triploid controls

Final report

Final Report • 2017-09-29 • 580.00 KB
1996-357-DLD.pdf
Environment
Blank
PROJECT NUMBER • 2009-763
PROJECT STATUS:
COMPLETED

SCRC: SCRC Honours Scholarship H3.1– Impact of commercial hatchery practices on the contribution of broodstock to offspring and genetic diversity in the Yellowtail Kingfish breeding program (Dr Alex Safari: Student Daniel Tan)

Using small numbers of broodstock for breeding often leads to random drift in gene frequencies between generations. Effective population size (Ne) is used as an indicator to assess the rate of inbreeding and loss of genetic variation in small populations. In this study we used six microsatellites,...
ORGANISATION:
Flinders University
TAGS
Stock Assessment
Reproduction
Mortality
Husbandry
Education
Environment
Environment
PROJECT NUMBER • 1998-205
PROJECT STATUS:
COMPLETED

Construction and evaluation of an underwater setting device to prevent accidental capture of seabirds on tuna longliners

Longline fishing is one of the world's major methods of catching fish (Lokkeborg 1999). Some seabirds, particularly albatrosses and petrels have learnt to take bait from longlines while the lines are being set and when doing so put themselves at risk. If they either swallow the hook or become...
ORGANISATION:
Parks and Wildlife Service Tasmania
TAGS
Mortality
Fishing Gear
Bycatch
SPECIES
Southern Bluefin Tuna
People
PROJECT NUMBER • 1998-362
PROJECT STATUS:
COMPLETED

Workshop on post settlement processes affecting the southern rock lobster (Jasus edwardsii) in southern Australia

Research into the southern rock lobster in Australia has concentrated on the catching sector (primarily commercial) with limited research being undertaken on the post-settlement and juvenile stages. To maximise the outputs of investigating these stages, while at the same time minimising costs,...
ORGANISATION:
University of Tasmania (UTAS)
TAGS
Workshop
Resource Rehabilitation
Population Dynamics
Mortality
Habitat
Environment
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