2 results

Developing a Kimberley Aboriginal Mud Crab Fishery

Project number: 2022-138
Project Status:
Current
Budget expenditure: $736,621.00
Principal Investigator: Lachlan Strain
Organisation: Department of Primary Industries and Regional Development (DPIRD) WA
Project start/end date: 30 Jun 2023 - 29 Jun 2026
Contact:
FRDC
SPECIES

Need

The commercial mud crab fishery in WA has yet to develop to its full potential due to a limited understanding of the mud crab resource, a lack of capacity, isolation from markets, and the logistical constraints of the remote and challenging environment of the Kimberley region. The development of Aboriginal fisheries is a high priority for DPIRD and FRDC, and this proposal to promote the Kimberley Aboriginal mud crab fishery aligns directly with this strategic objective. The project also addresses key priorities adopted by the WARAC and WAFIC, such as the development of Aboriginal and under-utilised fisheries in WA. The project represents a 2-way capacity building opportunity between Aboriginal people and DPIRD staff, with data generated during this project on species biology, spatial distribution and relative abundance informing future stock assessments to improve certainty around the sustainability of the WA mud crab resource. Specifically, the project will:

• use applicable and demonstrative scientific outcomes to develop participative management approaches for the Kimberley mud crab fishery that aim for fairness through prescribed fishery controls (trap allocations, harvest
strategies etc.) (Fair and secure access to aquatic resources).

• increase learning and sharing between Traditional Owners and DPIRD through identifying, documenting and promoting Aboriginal fisheries management systems and fishing practices. Identify a suitable working model for the
Indigenous mud crab fishery in the Kimberley which is culturally informed and reflects the relative abundance of the available mud crab resource. (Best practises and production systems).

• improve connection of Traditional Owners in the Kimberley region with mud crab fishing initiatives that promote economic opportunities (Growth for enduring prosperity).

• strengthen the association across Traditional Owner groups, commercial and recreational mud crab fishers, FRDC and DPIRD to maximise cooperative partnerships that promote greater inclusiveness, creative thought and solution
seeking to support the economic viability of the Kimberley mud crab fishery (A culture that is inclusive and forward thinking).

• promote relationships and communications between stakeholders and the Kimberley community through transparent decision-making tools and best practice fisheries management that ensures a fair distribution of economic and
societal benefits from the Kimberley mud crab resource (Community trust, respect and value).

Objectives

1. Determine the biology and distribution of mud crab species (Scylla serrata and S. olivacea) in King Sound and Cambridge Gulf areas of the Kimberley region of Western Australia.
2. Determine the relative abundance of mud crabs within and between sites in King Sound and Cambridge Gulf across different habitat types (mangrove creeks vs channels vs mud flats) and tidal cycles (spring vs neap).
3. Transfer of mud crab commercial fishing methods, western scientific techniques, and traditional knowledge between Traditional Owners and DPIRD for future commercial application, through collaborative research surveys, DPIRD-led On-Country workshops and a related DPIRD-CRCNA Aboriginal Fishing and Aquaculture project (2022-24).

Understanding the relationship between commercial prawn species population dynamics, fishing patterns and climate in the Shark Bay World Heritage area in Western Australia

Project number: 2019-015
Project Status:
Current
Budget expenditure: $575,616.00
Principal Investigator: Inigo M. Koefoed
Organisation: Department of Primary Industries and Regional Development (DPIRD) WA
Project start/end date: 5 Jan 2020 - 5 Jan 2023
Contact:
FRDC

Need

There is growing concern the sustainability of prawns may be at increased risk due to a higher proportion of small prawns in commercial catches and fishery-independent recruitment surveys. The brown tiger prawn stock experienced its lowest recruitment in 3 years. The causes of change in prawn size and the magnitude of recruitment remain unknown, but we can identify some plausible hypotheses. These include; slowing of growth with lower winter temperatures, a reduction in productivity, changes to timing of spawning, total fishing pressure and intra-annual fishing patterns. It is possible that changes are influenced by interactions between some or all of these.

A higher proportion of smaller prawns in commercial catches has continued despite adjustments to management. In addition, the location of prawns during the season has become less predictable. There is an urgent and immediate need to understand the mechanisms underlying these changes to make the necessary management changes to ensure long-term sustainability. The approach will be to use existing datasets to test hypotheses about potential associations between physical (e.g. temperature, rainfall), biological (e.g. seagrass cover), and fishery (e.g. prawn recruitment) variables that we would expect to occur under plausible cause-effect scenarios. These scenarios will be developed through discussions between researchers with different skill sets and insights from prawn fishers.

The study will adopt a multi-disciplinary approach to utilise expertise of researchers with skills beyond conventional fisheries science and management, including oceanography, ecology, data science and mathematics, and research specific to the SBPMF and synthesis of the fishing industry. The objectives clearly address both WARAC and the Prawn IPA key priorities of adaptive approaches to changing climate.

The objectives are supported by DPIRD managers and some sections of the Shark Bay prawn trawl industry. An independent review of the prawn fishery conducted in April 2019 by Malcolm Haddon provided recommendations regarding research priorities. The review found the objectives addressed a number of key uncertainties identified in the review and suggested they were urgent.

Objectives

1. Understand the impact of changing temperature and other environmental parameters (e.g. seagrass, flooding events) on the reproductive cycles, growth and distribution patterns of western king and brown tiger prawns
2. Understand the relative contribution of autumn and spring spawning stock to the catch and prawn size composition to assess why there are more small prawns in the fishery at the start of the year and whether harvesting large volumes of small prawns impact subsequent recruitment.
3. Develop performance indicators for the Shark Bay Prawn Harvest Strategy (HS) (which is currently based on abundance indices), if appropriate, that are related to size of prawns.
4. Determine if information on ecological processes and primary productivity are sufficient to construct predictive models of prawn carrying capacity.
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