Assessing the impact of proposed marine protected areas on South Australian rock lobster catches
To provide quantitative measures of the impact of proposed Marine Protected Areas in South Australia on commercial landings of rock lobster, and to provide tools for the negotiation of specific MPA boundaries, so as to minimise the impact on rock lobster production, while still allowing protection of marine biodiversity.
Final report
A state and federal collaborative program (NRSMPAs) to establish marine protected areas (MPAs) is underway nationwide. This project examines no-take zones designated for state territorial waters which lie predominantly inside 3 nautical miles from shore.
In South Australia, the lobster industry peak bodies, in conjunction with state marine conservation NGO’s, have endorsed the position that harvesting rights (pots owned with associated license to fish) should be bought back (and thus be permanently removed from the fishery) in order that the effort displaced out of newly created no-take zones did not increase levels of exploitation in the remaining still-fishable habitat. This alliance of fishing industry and conservation lobby recommended a policy in state government, now adopted, that effort displaced from no-take areas should be removed in a one-off state government purchase of those harvesting rights.
The principal output of this project is an estimate of the number of licensed lobster pots needing removal to balance the average net yearly catch loss due to MPAs established. To achieve this aim there are two stages, namely Objectives 1 and 2 of this project. The first stage is to estimate the average historical catches per year in each spatial sub-block. The second stage, is to account for catch benefits from established no-take areas that lessen the loss of long-term catch.
Keywords: Marine Protected Areas, lobster fishery, catch loss, displaced effort, buy-out, emigration, stock-recruitment, density dependence
Beche-de-mer knowata product development
Informing and capitalising on the seasonality of Australian seafood (stage 2)
Evaluation of harvesting strategies for Australian fisheries at different levels of risk from economic collapse
Final report
Management of a marine renewable resource involves selecting a trade-off between conflicting objectives related to conservation and utilization. This problem is complicated by uncertainty about the current status and productivity of the resource being managed, and hence about the implications of alternative management measures. A general quantitative framework for evaluating these trade-offs in the face of uncertainty is developed. This framework allows for uncertainty about the current state of the resource and the observational error associated with future data. It can assess the performances of a variety of harvest strategies based on setting total allowable catches (TACs). These include constant catch, fixed escapement and constant fishing effort strategies. It is possible to constrain the changes in TAC from one year to the next. This framework is illustrated using the eastern stock of gemfish.
It is necessary to quantify the status of the resource to apply this framework. In this project, the historical trends in, current status of, and productivity of the eastern gemfish population is evaluated using two age-structured assessment approaches tailored to the specifics of the gemfish resource. These methods take account of the two-fishery nature of the resource, explicitly consider sex-structure, and use the catches, the catch rates in the winter fishery, the length frequency data and the age-length keys. This resource is estimated to have declined markedly during the 1980s as a consequence of unsustainable catches and a long series of weak year-classes. However, the assessments cannot distinguish among alternatives for the relationship between spawning stock size and future recruitment. The two assessments arrive at different conclusions regarding the size of the resource relative to AFMAs harvesting target of 40% of virgin level.
Modelling prawn movement and spatial dynamics in the Spencer Gulf and West Coast Prawn Fisheries
There is a need for a better understanding of prawn movement and spatial dynamics for improved management and stock assessment in the Spencer Gulf and West Coast prawn fisheries. There is a need to analyse, document and publish information on harvest strategies, prawn movement, commercial logbook and survey spatial data. The ability to produce accurate annual stock assessment reports addressing biological and economic performance indicators is required utilising data from diverse sources including those detailed above. Most importantly, there is a need to develop an effective spatial data base system to handle large complex datasets, enabling analysts to undertake their work. The current data base systems are inefficient and cannot link the analytical software (GIS and statistical applications) effectively or handle the diverse range of data formats required. The project will enhance and develop a spatial data base system, which integrates closely with the statistical and communication software, thereby enabling analysis, plotting, visualisation, modeling and information dissemination. One important spatial module to be developed, relates to prawn tag recaptures and will require links to commercial logbook and survey data.
There is a need to improve management and stock assessment by receiving more detailed catch information in real time. Here communication from ship to base will allow accurate graded size data to be used in stock assessment and for evaluation of fishery performance indicators.
There is a need for better analysis, visualisation and communication of spatial datasets. This will increase the level of understanding of the complex results for industry and management. Harvest systems need to link real time spatial information to decision rules for effective management. Industry frequently raises questions relevant to adaptive change in fishing strategies. For example “When should different areas be fished if prawns move from location A to location B?” or another example “What are the benefits of different types of harvest strategies for stock maintenance and economic performance?” A major problem for management is the clear communication of complex information and processes to others. There is a need to enhance all levels of communication and understanding of the information; adequate visualisation of the data can only achieve this.
Despite the importance to management, little attention in Australia has focussed on adaptive management processes that actively involve industry. The Spencer Gulf prawn fishery provides a good example of a successful adaptive management system in which industry actively participates. There is a need to document the management approaches that have taken more than fifteen years to develop and test. There are likely to be other fisheries in Australia where real time management and monitoring systems can provide substantial economic gain and cost savings.
The application of modern computerised mapping systems, computer intensive statistical analysis and modeling provide enormous scope for fisheries science and management. There is a real need to develop and improve data collection and analytical techniques for stock assessment of dynamic populations (e.g. prawn), especially for those fisheries under high exploitation pressure.
In summary, the project will develop an efficient spatial database that:
- Integrates closely with GIS and statistical analysis,
- Improves catch data collection,
- Results in more reliable stock assessment,
- Improves the efficiency of management through electronic data transfer,
- Increases the understanding and communication of complex spatial information.
Finally, the work will enable substantial historical data obtained from the Spencer Gulf and West Coast fisheries to be integrated, analysed, documented and published.
Final report
Review of Giant crab R&D
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
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.
Final report
Shark depredation in Australian fisheries: understanding the scope of the issue and identify potential mitigation options
Shark depredation of catches have been nationally acknowledged as an issue for all stakeholders – however, much of the information is anecdotal and there is a lack of clarity on where efforts need to be prioritised to find possible solutions.
In response, the FRDC will facilitate up to two national workshops to understand the scope of depredation and approaches to mitigate and manage this source of mortality.
Report
Project products
People development program: FRDC visiting fellows program - Dr. Alyssa Joyce
The Australian government biosecurity committee structure has recently undergone a major change with the development of AusBioSec (http://www.daff.gov.au/animal-plant-health/pests-diseases-weeds/biosecurity/ausbiosec). As part of this restructure, as of July 2009 Aquatic Animal Health Committee (AAHC) will cease to exist and it’s roles and responsibilities will be subsumed into Animal Health Committee (AHC). AAH technical expertise to AHC will continue to be provided by the National Aquatic Animal Health Technical Working Group (NAAHTWG). However, while AAHC included industry representation, AHC does not. For terrestrial animals, and plants, industry representation comes with membership to Animal Health Australia (AHA) and Plant Health Australia (PHA), respectively. However, there is no such entity for aquatic animal industries. This lack of industry input into AAH policy development has not been lost on AHC and it has advised that it would consider advice from an industry reference group (IRG). AHC has provided some advice on the terms of reference and priority issues for the IRG.
In order to be able to provide this advice industry must first decide whether or not there is sufficient resolve in each sector to commit to self-funding participation in an “National Aquatic Animal Health Industry Reference Group” (NAAHIRG).
It is this last point for which this application is based. The four sectors (wild-capture, aquaculture, ornamental and recreational) are seeking seed funding from FRDC to support a face-to-face meeting for industry representatives to discuss formation of an AAHIRG.
The need and urgency that has prompted this TRF application revolves around the threat of policy development without industry input. This point gains more significance upon release of the Beale report on Australia’s biosecurity arrangements and the Government’s response agreeing ‘in-principle’ to all the recommendations. Industry has to decide sooner rather than later whether it wishes to be a part of future AAH policy development.