7 results
Environment
PROJECT NUMBER • 2015-017
PROJECT STATUS:
COMPLETED

Maximise yield or minimise risk in the Blacklip Abalone fishery: using biological data to direct harvest strategies

The primary goal of this research was to identify attributes of the seasonal biology of Blacklip Abalone (Haliotis rubra; hereafter referred to as Blacklip) that may be beneficial for optimising fishing strategies. The optimum months to harvest Blacklip to maximise yield were identified using a...
ORGANISATION:
SARDI Food Safety and Innovation
Industry
Industry
PROJECT NUMBER • 2009-714.20
PROJECT STATUS:
COMPLETED

Seafood CRC: bioeconomic decision support tools for Southern Rock Lobster

The Southern Rocklobster fishery is the most developed of the fisheries included in this series of projects because sophisticated bioeconomic models and stock projection capacity had already been advanced through previous research. This research takes the process further to extend the modelling...
ORGANISATION:
SARDI Food Safety and Innovation

Tactical Research Fund: Shark Futures - determining the most suitable index of abundance for the school shark (Galeorhinus galeus) stock assessment: review and future directions to ensure best recovery estimates

Project number: 2011-078
Project Status:
Completed
Budget expenditure: $39,717.72
Principal Investigator: Charlie Huveneers
Organisation: SARDI Food Safety and Innovation
Project start/end date: 31 May 2012 - 30 Nov 2012
Contact:
FRDC

Need

Theme 1 - Demonstrating Sustainability: Evidence-Based and Low Risk Management for Shark-Associated Fisheries

Since 1992, school shark stocks were assessed as overfished in Australia and has been ever since. The most recent stock production of school sharks was estimated between 9–14% of original levels leading school sharks to be considered seriously overfished and listed as Conservation Dependent under the EPBC Act 1999. Under such listing, a stock rebuilding strategy policy had to be developed and needs to be implemented as conditions of the SESSF Wildlife Trade Operation (WTO) accreditation. The objectives of this rebuilding strategy states that school shark stocks have to recover to the limit reference biomass level within a biologically reasonable timeframe. The TAC for incidental take of the species was progressively reduced to well below the sustainable yield estimated by the SharkRAG. Although this reduction of TAC was considered to be sufficient, current models suggest school shark stocks will not rebuild within the period required under the Rebuilding Strategy. This lack of recovery is in apparent disagreement with catch observations by fishers and SharkRAG industry members. However, management of the stock aimed at reducing catch levels has altered the fishing pattern so that the traditional CPUE index of abundance can no longer be relied on as an index of stock size for school shark. The model is therefore unable to update current assumptions regarding the productivity of the stock. If the model is in error regarding such productivity, so that rebuilding is occurring at a faster or slower rate than predicted, such trends will not be identified. Such uncertainty associated with the school shark assessment has to a significant extent paralysed SE MAC consideration of management arrangements for this species. A valid index of abundance that will reveal current trends in stock status is required.

Objectives

1. Identify key scientists able to provide advice regarding suitable indices of abundance
2. Organise a 2-day workshop to foster discussion about an index of abundance for the SESSF school shark stock
3. Review of the current stock assessment and identify the potential issues leading to uncertainties regarding model outputs
4. Consider and assess alternative indices of abundance for school shark to input into the stock assessment model
Industry
PROJECT NUMBER • 1997-361
PROJECT STATUS:
COMPLETED

Southern Bluefin Tuna Aquaculture Subprogram Project 1: implementation and coordination of research experiments conducted with farmed southern bluefin tuna to assess manufactured diets, feeding regimes and harvesting techniques

The Southern Bluefin Tuna (SBT), Thunnus maccoyii, Aquaculture Industry has undergone rapid expansion since it commenced in 1990. In 2002/03 the industry was Australia’s third largest export fishing industry (ABARE, 2002) with most of its value coming from aquaculture. In this year the...
ORGANISATION:
SARDI Food Safety and Innovation
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