Assessing the impact of proposed marine protected areas on South Australian rock lobster catches
The Third International Billfish Symposium
The third international billfish symposium has been anticipated by the world's fisheries community since the previous two such meetings (1972,1988) were watersheds in the advancement of knowledge of these important fishes. There have been significant increases in the world's understanding of billfish species stock structure and population dynamics, and corresponding increases in concerns for some global stocks. The Australian populations of billfishes occur in waters off most States and are especially well represented in the region of the Great Barrier Reef. Much of this area has recently been declared to be of World Heritage value and magnificent arrangements for natural resources has been under considerable scrutiny from agencies and organisations not usually concerned with fisheries management. There is a need to examine the global status of our understanding of these fishes and the management regimes adopted throughout the world. Australia may benefit from such an understanding. The broadbill swordfish is in decline in parts of the northern hemisphere and remedial action is needed to protect these stocks. Again, Australia would benefit from an understanding of past and present management practices for this species.
Development of a business plan for enhancement of saucer scallops in sub-tropical waters
Effects of Trawling Subprogram: implementation and assessment of bycatch reduction devices in the Shark Bay and Exmouth Gulf trawl fisheries
There is an urgent need to assess the impact of the planned introduction of BRDs on the databases used to manage these major trawl fisheries during the transition to full BRD usage. The proper evaluation of BRD implementation is often lacking in trawl fisheries. There is an urgent need for the project because the whole fleet, in Shark Bay for one season will tow one net with a BRD and one without. In the Exmouth prawn fishery and Shark Bay Scallop fishery several vessels will tow nets(s) on one side with a BRD and one side without. Without the project the implementation of BRD’s into both nets could be delayed.
Specifically, the changes in gear efficiency and fleet fishing behaviour (ie distribution of fishing effort) need to be quantified and incorporated into the extensive fisheries databases for these three closely managed fisheries. Secondly, the success of these devices in reducing the quantity of bycatch throughout the season, needs to be accurately assessed to provide advice to fishery and marine conservation agencies for ecosystem management purposes. The industry and marine conservation groups require a quantitative assessment of the effect of BRDs on catches of prawns and bycatch to ensure they are showing the desired impact.
For companies to maintain an exemption to export fish species under the Commonwealth Wildlife Protection (Regulation of Exports and Imports) Act 1982, they will need to prove that associated fishing practices are undertaking in a manner that is demonstrably ecologically sustainable. The Draft National Policy on Fisheries By-Catch, developed by the National standing Committee on Fisheries and Aquaculture, was recently adopted by the WA State Minister for Fisheries. Under the Minister's plan, the WA trawl fisheries, has been given a 'Priority A' rating, meaning that a specific By-catch Action Plan is to be completed by the end of 2001. The trawl industry is actively participating in trialing of BRDs to meet the required deadline. An observer program is needed to complement commercial operator records as high nightly catch rates make it difficult for vessel skippers and crew to record detailed information from individual nets.
Final report
Direct sensing of the size and abundance of target and non-target fauna in Australian fisheries - a national workshop
Australian Fisheries Research and Development reviews (eg FRDC 95/055) identify the need for non-destructive fishery independent stock assessment techniques for both target and non-target species, and the benthic habitats that many species occupy. There is also the need to develop and validate cost effective techniques that facilitate the comparison of data collected over a range of temporal and spatial scales for benthos, reef and inter reef fishes. To allow bona fide spatial and temporal comparisons of data, techniques need to minimise many of the biases inherent in fisheries and benthic habitat assessments. Subsequently there is also the need to standardise the methods and techniques that are being used by marine researchers around Australia in both shallow subtidal and deepwater environments.
Around Australia, and indeed the world, underwater video is seen as a tool that can satisfy many of the needs described above in both shallow and deepwater research. Consequently it is being adopted very quickly for the non-destructive sampling of a very broad range of organisms.
Unfortunately many researchers do not know how to maximise the information and data resulting from their recordings. Furthermore, while it is very easy to record a lot of information, the processing of images can be laborious resulting in a “bottleneck” in data analysis.
There is the need to make researchers aware of the possibilities and limitations of underwater videography as a tool and to determine the key concerns and research needs and wants. This would be achieved by involving key individuals from state fisheries agencies and academic institutions in the proposed workshop.
Final report
Increasing environmental concerns and policy shifts toward more holistic fishery ecosystem management have resulted in demand for rapid, non-destructive assessment techniques for sensing both target and non-target species in fisheries and mariculture, and for mapping benthic habitats. Underwater video is part of a suite of complimentary remote sensing tools that are being developed to fulfil this requirement in Australia and around the world. Rapid advances in video technology and image analysis have enabled wide adoption of this sampling approach to a variety of applications.
In September 2000, a three-day workshop was held on Rottnest Island, Western Australia, to share these advances, and identify gaps and opportunities in the national outlook for video techniques. The ultimate aim was to develop a Research and Development Plan for the Fisheries Research and Development Corporation, for a coordinated approach to new applications of the video tools and to help overcome bottlenecks in their development.
The workshop attracted 42 participants by invitation from key research and industry organisations in all States and from overseas. The workshop format aimed to share and concentrate experience and expertise from the full range of disciplines relevant to field deployment and application of the technique, image acquisition, calibration and analysis.