11 results

Development and evaluation of egg-based stock assessment methods for blue mackerel (Scomber australasicus) in southern Australia

Project number: 2002-061
Project Status:
Completed
Budget expenditure: $1,122,842.00
Principal Investigator: Timothy M. Ward
Organisation: SARDI Food Safety and Innovation
Project start/end date: 29 Jun 2002 - 28 Feb 2008
:

Need

Stock assessment methods need to be developed for blue mackerel for a range of economic, ecological, social and legislative/administrative reasons.

Perhaps most importantly, the large and valuable international markets for members of the genus Scomber, in conjunction with the apparently large stocks of blue mackerel off southern Australia, suggest that a commercial fishery for this species could generate significant export earnings. Furthermore, as the economic potential of this industry is well known, significant amounts of private and public funds have been invested trying to develop fisheries and processing facilities for this species. To date, the development of these industries has been impeded by the absence of the information required to establish appropriate TACs. In fact, trigger TACs in Commonwealth waters were halved recently as a precautionary response to scientific uncertainty regarding sustainable harvest levels.

Blue mackerel is also prized as bait by recreational anglers and reliable estimates of the quantities taken by this sector is needed to determine the total impacts of fishing and to make informed decisions about resource sharing amongst stakeholders (see Attachments 1-5). The need for data from the recreational sector is most pressing off the NSW coast.

There is also significant concern among recreational anglers that sustained commercial fishing for blue mackerel may affect the local abundance and availability of sportsfishes, such as tuna and billfishes. Australia’s recreational and charter fisheries for these sportfishes are economically important and provide a significant source of income for many regional communities (e.g. Port Stephens and southern NSW). If stocks of blue mackerels are not as large as commercial fishers claim, then the concerns of recreational fishers may be valid and further development of the commercial fisheries could potentially impact on the distribution, abundance and availability of sportfishes and the viability of the recreational and charter fisheries which they support.

Similarly, the removal of large quantities of a key prey species could adversely affect populations of other marine predators, including marine mammals and seabirds.

The species that prey on blue mackerel have considerable social and ecological significance. As a result, there is strong public pressure for Commonwealth and State governments to conduct research and develop management arrangements that will ensure that commercial harvesting of blue mackerel is ecologically sustainable. Commonwealth and state legislation, policies and strategies also require government agencies to ensure that the harvesting of fisheries resources not only provides maximum economic and social benefits to the Australian community, but also minimise impacts on other components of the ecosystem.

In the cost recovery frameworks in which most fisheries management and research agencies currently operate, acquiring funds to conduct research in support of small and developing (albeit potentially valuable) fisheries is problematic. The augmentative funding requested in this proposal is needed to ensure that the harvest strategies that are developed for blue mackerel off southern Australia reflect the social significance of the species as well as the size and potential economic value of the resource, and take into account the potential ecological effects of the expansion of the commercial sector.

The major impediment to the development of southern Australia’s commercial mackerel fisheries is the lack of quantitative information required to establish appropriate TACs. The most cost- and time-effective option for obtaining this information is to apply egg-based stock assessment methodologies, such as the Daily Egg Production Method (T.M. Ward et al. 1998, 2001; P. Ward et al. 2001). This project will (i) develop the methods for sampling adults and identifying and staging eggs that are required to apply egg-based stock assessment methods to blue mackerel and (ii) use the Daily Egg Production Method to calculate conservative estimates of minimum spawning biomass of blue mackerel off southeastern Australia.

Objectives

1. To synthesise information available on the fisheries for blue mackerel in southern Australia. (Note that information on the biology of blue mackerel will be reviewed as part of the objectives that deal specifically with age and growth, reproductive biology, stock assessment, etc.).
2. To describe thestock structure of blue mackerel in south-eastern Australia.
3. To estimate the number, size, frequency and total weight of blue mackerel taken by recreational (charter, gamefish and trailer boat) fishers of the New South Wales coast.
4. To describe the spatial and temporal patterns of age and growth and compare the age structure of commercial catches and fishery independent samples of blue mackerel taken from throughout southern Australia.
5. To compare the spatial and temporal patterns of age commercial and recreational catches samples of blue mackerel taken from NSW.
6. To describe reproductive biology, especially spawning fractions and batch fecundity, of blue mackerel in South-eastern Australia.
7. To establish methods and criteria for identifying and staging the eggs and larvae of blue mackerel.
8. To estimate the distribution and abundance of eggs and larvae of small pelagic species in south eastern Australia (Scomber australasicus, Trachurus spp., Sardinops sagax, Engraulis australis, Etrumeus teres)
9. To develop and evaluate methods for estimating the spawning biomass of blue mackerel in southern Australia.
10. To evaluate potential harvest strategies for blue mackerel in southern Australia and provide preliminary estimates of the potential yields for each zone of the Commonwealth fishery

Final report

Environment
Environment
Environment
PROJECT NUMBER • 2008-064
PROJECT STATUS:
COMPLETED

Tactical Research Fund: Management Strategy Evaluation (MSE) of the harvest strategy for the Small Pelagic Fishery

In 2008, the Australian Fisheries Management Authority (AFMA) developed a harvest strategy for the Commonwealth’s Small Pelagic Fishery (SPF) (AFMA 2008) in accordance with the Commonwealth Fisheries Harvest Strategy Policy (DAFF 2007). Before its completion, an independent review was conducted...
ORGANISATION:
Department of Agriculture, Fisheries and Forestry (DAFF) ABARES
Environment
PROJECT NUMBER • 2013-028
PROJECT STATUS:
COMPLETED

Review and update harvest strategy settings for the Commonwealth small pelagic fishery

This study undertook ecosystem and population modelling to evaluate and provide advice on the reference points (e.g. biomass depletion levels) and settings (e.g. exploitation rates) for the four main target species in the harvest strategy of the Commonwealth Small Pelagic Fishery (SPF) – Jack...
ORGANISATION:
CSIRO Oceans and Atmosphere Hobart
Environment
PROJECT NUMBER • 2017-027
PROJECT STATUS:
COMPLETED

Validating a new sampling technique for estimating egg production

Estimates of spawning biomass obtained using the Daily Egg Production Method (DEPM) are the primary biological performance indicator in the South Australian Sardine Fishery (SASF) and Commonwealth Small Pelagic Fishery (SPF). The DEPM is also being used to assess the status of other...
ORGANISATION:
SARDI Food Safety and Innovation
Communities
PROJECT NUMBER • 2017-098
PROJECT STATUS:
COMPLETED

Southern Bluefin Tuna: Changing The Trajectory

Life on the Line is the true story of the Southern Bluefin Tuna, its biological traits and its history of exploitation and most recently its recovery. This documentary covers how research, managers and the fishing industry - commercial and recreational have contributed to the recovering status of...
ORGANISATION:
Australian Fisheries Management Authority (AFMA)

Visiting scientist: Kostas Ganias - expert on fish reproductive biology related to egg production methods

Project number: 2016-103
Project Status:
Completed
Budget expenditure: $8,000.00
Principal Investigator: Timothy M. Ward
Organisation: SARDI Food Safety and Innovation
Project start/end date: 31 Jul 2017 - 29 Nov 2017
:

Need

The South Australian Sardine Fishery is Australia's largest volume fishery.

There is a need to ensure that estimates of spawning biomass which underpin management of the fishery are as accurate and precise as possible.

Recent research to support the SASF have focused on refining estimates of daily egg production.

This study is designed to review and enhance methods used to estimate adult parameters, especially spawning fraction and batch fecundity.

Funding for Dr Ganias to travel to Australia is needed to review current methodologies and provide recommendations to ensure methods used in the SASF and other Australian fisheries are consistent with world's best practice.

Objectives

1. Review methods used to estimate spawning fraction and batch fecundity for Australian species, including Sardine, Jack Mackerel, Blue Mackerel Redbait and Snapper
2. Compare Australian and European experience related to application of egg production methods

Final report

Author: Konstantinos Ganias
Final Report • 2018-02-01 • 3.02 MB
2016-103-DLD.pdf

Summary

The Daily Egg Production Method is used to estimate the spawning biomass of several Australian fisheries for pelagic species, including the South Australian Sardine Fishery and Commonwealth Small Pelagic Fishery. Dr Kostas Ganias of Aristotle University of Thessaloniki is a world leader in the reproductive biology of small pelagic fishes related to the application egg production methods. The aim of the Dr Ganias’ visit to Australia was to evaluate and recommend options for improving the methods used to estimate the spawning fraction and fecundity of Australian Sardine, Jack Mackerel, Blue Mackerel and Redbait.  Dr Ganias made three key recommendations that have the potential to improve application of the Daily Egg Production Method to Australia's small pelagic fisheries.

Project products

Report • 2018-11-21 • 185.26 KB
2016-103 Overseas Travel Report ICES ASC 2018 FRDC.pdf

Summary

Associate Professor Tim Ward Overseas Travel Report 'International Council for the Exploration of the Sea (ICES) Annual Science Conference in Hamburg, Germany in September 2018'
Environment
Environment
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