Options to effectively monitor and regulate recreational catch in the Tasmanian rock lobster fishery

Project number: 2019-183
Project Status:
Completed
Budget expenditure: $110,000.00
Principal Investigator: Nils Krueck
Organisation: University of Tasmania
Project start/end date: 30 Nov 2020 - 29 Nov 2021
Contact:
FRDC

Need

Southern Rock Lobster is one of Tasmania’s most valuable commercial and recreational fishery species. Rock lobster are taken using traps and hand collection methods, with recreational fishers subject to licensing and a range of traditional management measures, including bag and size limits as well as seasonal closures.

Recreational fishing effort is concentrated off eastern Tasmania where recent assessments indicate that rock lobster stocks have been depleted by the combined effects of heavy fishing pressure and poor recruitment. Fishery simulations suggest that catches must be reduced to facilitate stock recovery above the biomass limit reference point (20% of unfished levels), initiating a 10-year stock rebuilding strategy that was implemented in 2013. A key element of this strategy is an annual catch limit, which is underpinned by a total allowable catch for the commercial sector and a region-specific notional catch share allocation for the recreational sector. While commercial catches are monitored and effectively controlled through an existing quota management system, management of the recreational catch has proven more problematic.

Reductions in bag and possession limits as well as a progressive reduction in season length have failed to achieve necessary reductions in recreational catch to target levels. This situation is likely to be exacerbated as stocks rebuild, resulting in higher catch rates that may incentivize additional recreational fishing pressure. Thus, achieving the stock recovery target depends on effectively regulating catches taken by the recreational sector. A novel approach supported by stakeholders is the introduction of an individual season limit. However, there are many practical issues to be considered in implementing this or any alternative management system. This project aims to combine an in-depth global review of existing recreational management systems with a feasibility analysis of candidate management schemes to effectively monitor and regulate recreational rock lobster catches in a practical and cost-effective manner.

Objectives

1. In-depth review of existing management systems to monitor and constrain recreational harvest
2. Assess the practical feasibility of implementing alternative management systems to regulate and monitor the recreational rock lobster catch
3. Develop a business case and implementation plan for a preferred catch management system for the Tasmania recreational rock lobster fishery.

Final report

ISBN: 978-1-922708-20-5
Author: Samantha Twiname
Final Report • 2022-04-08 • 2.12 MB
2019-183-DLD.pdf

Summary

This project was initiated to investigate alternative options to effectively monitor and constrain the recreational rock lobster catch, particularly in the East Coast Stock Rebuilding Zone.

Related research

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Postgraduate funding - Population biology and dynamics of Yellowfin Whiting

Project number: 2019-179
Project Status:
Current
Budget expenditure: $75,000.00
Principal Investigator: Bronwyn M. Gillanders
Organisation: University of Adelaide
Project start/end date: 4 Oct 2020 - 30 Jun 2024
Contact:
FRDC

Need

The South Australian Marine Scalefish Fishery (MSF) is the most complex fishery in South Australia and is currently undergoing transition through structural reform, development of new harvest strategies and review of the Management Plan. Changes in the dynamics of the fleet have resulted in redirection of effort from primary species such as garfish, snapper and King George whiting towards secondary species including yellowfin whiting.

Yellowfin whiting Sillago schomburgkii is the second most valuable Sillaginid after King George whiting and one of the most valuable secondary species in the MSF fishery with most catches from Northern Spencer Gulf, and smaller catches from the West Coast, Southern Spencer Gulf, and Gulf St Vincent. There are also significant recreational catches (31.5% of State catch in 2013/14).

There is a need for improved understanding of the life-history of yellowfin whiting with quantitative estimates of population dynamics including reproduction, growth performance and stock structure. Oceanographic separation of Spencer Gulf and Gulf St Vincent suggests that yellowfin whiting may constitute separate stocks in these regions while possible population sub-structuring occurring at smaller scales has implications for fishery management. There is potential to compare results of the proposed study with previous work to investigate whether decadal changes in the demography and population dynamics of yellowfin whiting have occurred in the South Australian Gulfs, as well as potential factors driving any change.

This project proposal aims to (i) build the capacity for scientific investigation of finfish species in South Australia by providing an opportunity for a science graduate to develop skills in fishery science, (ii) improve the understanding of life-history and population dynamics of yellowfin whiting, and (iii) improve understanding of the stock structure of yellowfin whiting. This project will have linkages to another FRDC funded project (2017/023), “ESD risk assessment for under-utilised species to facilitate structural reform of South Australia’s commercial Marine Scalefish Fishery”.

Objectives

1. Define the stock structure of yellowfin whiting in South Australia and the relationship to Western Australian stocks using genomic approaches.
2. Define finer scale population structure of yellowfin whiting in the South Australian gulfs using otolith chemistry.
3. Examine spatial and temporal trends in catch among yellowfin whiting and other species in the marine scalefish fishery and how representation among different life-history strategy groups has changed.
4. Investigate size and age structures of yellowfin whiting in the two gulfs of SA and how these have changed over a 22 year period.
5. Increase fisheries science capacity in South Australia through training of the next generation of researchers.