23 results

A South Australian gulfs and coastal ecosystem model to optimise multi-species fisheries management in a changing environment

Project number: 2018-011
Project Status:
Current
Budget expenditure: $218,932.00
Principal Investigator: Simon D. Goldsworthy
Organisation: University of Adelaide
Project start/end date: 3 Jun 2019 - 17 Dec 2020
Contact:
FRDC

Need

The SA State Government has made a commitment to reform the Marine Scalefish Fishery (MSF) that aims to provide long-term sustainability of key stocks for both recreational and commercial fisheries, and unlock the industries economic potential. The key reforms include a voluntary buy-back scheme targeting the removal of at least 30% of commercial licences and the introduction of new zoning and quota management regulations. The timeframe for the reforms will be determined in consultation with the industry. Details on the implementation strategy have yet to be developed, but will need to be underpinned by extensive stakeholder consultation and backed by research that provides confidence that among the approaches considered, those chosen will best deliver the intent of the reforms.

This project aims to develop an SA Gulfs and Coastal ecosystem model to provide a Management Strategy Evaluation (MSE) tool to assess and optimise a range of reform scenarios. The project will link in closely with FRDC 2017/014 (Informing structural reform in the MSF), utilising many of its key outputs, including time series of spatial distribution of catch and effort, social-economic performance, and reform implementation scenarios. This project also will extend the investigation by integrating environmental time-series data to evaluate changes in productivity over time, identified as a potential factor in declining fisheries catches in the GSV ecosystem (FRDC 2013/031). Identifying the causes of productivity loss and its impact on fish production are important to resolve, especially in the context of the MSF reforms. Ultimately, the project aims to provide decision support tools to assess and evaluate the performance of diverse fisheries management strategies, and how these may perform under varying production regimes. Such an approach will provide a platform to evaluate and optimise the effectiveness of management strategies, and help ensure the fishery reforms achieve their key objectives.

Objectives

1. Develop an SA Gulfs and Coastal Ecosystem model to provide a MSE tool to inform and optimise multi-regional management, quotas for multi-species fisheries and multi-sector harvest strategies
2. Use the model to run scenarios to assess, evaluate and optimise Marine Scalefish Fishery reform options
3. Assess potential production loss issues, and evaluate how different MSF reform options may perform under different future production scenarios

Investigating aetiology and risk factors of ocular lesions and associated mortality in ranched Southern Bluefin Tuna

Project number: 2017-174
Project Status:
Current
Budget expenditure: $200,238.00
Principal Investigator: Charles Caraguel
Organisation: University of Adelaide
Project start/end date: 31 Dec 2017 - 29 Jun 2019
Contact:
FRDC

Need

This year (2017), some of the ranching operations reported the increased cumulative mortality. In some severe cases, up to 90% of collected mortalities present some degree of unilateral or bilateral ocular damage ranging from corneal cloudiness, with or without ulcers, up to complete perforation. The anecdotal report of eye lesions has progressively increased since the 2015 season without a definitive cause being identified. Previous reports (Rough et al., 1999; Rough, 2000; Hayward et al., 2007; Hayward et al., 2008a; Hayward et al., 2008b; Hayward et al., 2009; Hayward et al., 2010; Hayward et al., 2011, including FRDC projects No 2003/225 and 2008/228, Nowak et al., 2007; Nowak et al., 2012) identified sea lice of the genus Caligus spp. as a differential cause of eye lesions in SBT. The copepod ectoparasite is thought to damage the eyes by feeding on the cornea epithelium of infested SBT. Lesions worsen when fish flash against the cage’s net to dislodge the itchy copepods. Partial or full vision loss is suspected to impair the capacity of the fish to compete for feed and to result, with time, in the death of affected fish. At this stage, it is unclear:
1 - what is the distribution of the observed increased mortality across the industry;
2 - what is the occurrence and severity of eye lesions across the industry;
3 - if the observed increased mortality is entirely attributable to eye lesions;
4 - if eye lesions are solely caused by C. chiastos or if other causes are involved;
5 - if potential tow-, cage-, and fish-level risk factors are associated with the occurrence of eye lesions and its cause(s).

Objectives

1. Estimate the frequency and distribution of increased mortality across the industry.
2. Describe the pathology and severity of eye lesions and estimate the frequency and distribution of these lesions across the industry.
3. Investigate potential tow-, farm-, and fish-level risk factors associated with increased mortality and eye lesion occurrence.
4. Investigate the putative role of sealice in causing this episode of eye lesions.
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