NSW DPI Seafood Innovation Program
Evaluating the economic and environmental return on investment of modern fish screens
This project is about helping people look after fish and farms.
Most water diversions in Australia are either unscreened or use outdated ‘trash racks’. These are poor performers – providing very little protection against the entrainment of native fish and debris. As a result, millions of native fish are lost from our waterways ever year and farmers needlessly suffer debris in their irrigation systems, which can damage pumps, clog filters and block sprinklers.
Modern fish-protection screens are available for use in Australia. They keep fish and debris where they belong – in the river and out of irrigation infrastructure. They have the potential to provide significant, widespread benefits for both biodiversity and businesses. Early accounts from farmers at over 20 showcase sites across the Murray-Darling Basin show that farmers are already saving time and money through reduced labour and maintenance costs. However, this evidence is largely anecdotal. There is a real need to rigorously document and communicate the environmental and economic benefits of modern screens. Being able to document these benefits will enable screening to move from an international best practice which is poorly applied in Australia, to common-practice in Australia.
The proposed project fills a critical knowledge gap in the evolution of modern fish screening in Australia, by recording and articulating the public and private value proposition of modern screens across a range of farming systems. Doing so will (1) improve farmer awareness and understanding of modern screening technology; (2) inform farmers’ decision-making, to maximise returns on investment; and, (3) guide prioritisation and integration of screening in large-scale conservation and fisheries management policy. Ultimately, this project aims to support adoption of screens where they are most beneficial to deliver benefits for rivers, fish and farms.
Review of national guidelines to develop fishery harvest strategies
The current National Guidelines were developed through the FRDC (Project 2010/061) with recognition of the need for a coordinated, nationally consistent approach to establishing harvest strategies for Australian fisheries. At this time, the Commonwealth Harvest Strategy Policy and Guidelines (2007, now updated) provided a foundation for harvest strategy development in Commonwealth managed fisheries, however implementation of the key elements of harvest strategies (defined objectives, indicators, assessments, reference points, trigger points and decision rules) varied across jurisdictions, and gaps remained for data limited fisheries.
Similar to the proposed project, the AFMF and FRDC recognised that support for development of harvest strategies could be improved through development of the National Guidelines that focused on less developed areas of harvest strategy policy, including cross-jurisdictional and recreational management arrangements, and incorporating quadruple bottom line (ecological, social, cultural and economic) analysis into fisheries decision making.
As harvest strategy policy and incorporation of quadruple bottom line ecologically sustainable development (ESD) principles have increased as management priorities, harvest strategies have sought to incorporate increasingly challenging issues, in many cases continuing to use disparate approaches between jurisdictions that arguably hold the same objectives and responsibilities, as well as potentially competing interests.
In many cases, harvest strategy policy and development has been held back from achieving quadruple bottom line objectives due to a lack of consistency in the outlook and approach between jurisdictions, and available guidance for dealing with the complexities associated with multi-species, multi-sector or multi-jurisdictional issues. With significant developments occurring around traditional fishing and management, progressing the inclusion of cultural fishing specific objectives is also required.
In addition, the review provides opportunity to address broader issues including the relationship and function of harvest strategies in association with shared access with competing users, cultural interests, ecological issues (e.g. habitat degradation, pollution and climate change), and marine conservation areas, as well as options, incentives and trade-offs for improving data, monitoring and assessment in data poor fisheries or sectors.
The proposed review will ensure the National Guidelines remain a prominent, independent and contemporary guide for fisheries jurisdictions, managers, researchers, fishers and stakeholders in supporting the review of harvest strategy policy frameworks and the development of harvest strategies that in many cases seek to resolve complex issues and balance competing interests.
To achieve this, the proposed project aims to:
1. Review and update the National Guidelines to Develop Fishery Harvest Strategies to ensure the National Guidelines are consistent with current harvest strategy utilisation, address contemporary fisheries challenges and the most up to date information available;
2. Take stock of harvest strategies in Australia (by jurisdiction) and internationally, including how many fisheries now have operational harvest strategies adopted and those under development; and
3. Produce a report with the updated National Guidelines coupled with a detailed communication plan and associated materials to promote and communicate the outcome of the review with all stakeholders.
An updated understanding of Eastern School Whiting stock structure and improved stock assessment for cross-jurisdictional management
Most of the commercial catch of Eastern School Whiting is taken by the Commonwealth South East Trawl (SET) sector of the Southern and Eastern Scalefish and Shark Fishery (SESSF) in eastern Victorian waters and Bass Strait and in the NSW Ocean Trawl Fishery in central and northern NSW waters. Smaller amounts are reported from inshore state waters of southern NSW, Victoria and Tasmania (Conran et al. 2018).
Eastern School Whiting have been managed by catch quotas in Commonwealth fisheries since 1993. A Commonwealth Tier 1 stock assessment is completed every 3–5 years to estimate the recommended biological catch (RBC) for the entire biological stock. Historically, the estimated discards and average state catches were then subtracted from the RBC to set the Commonwealth total allowable catch (TAC). The most recent stock assessment in 2017, calculated an RBC of 1,606 t and the 2019–20 Commonwealth TAC was set at 788 t.
A new basket TAC for Eastern School Whiting and Stout Whiting was introduced in NSW state waters from May 2019 (set at 1,189 t for the 2019–20 fishing year). While some of this catch is likely to comprise Stout Whiting, the combined total of the two independently determined TACs could permit total catches of Eastern School Whiting that exceed the current RBC for the shared stock. Furthermore, as part of these management reforms, the NSW Southern Fish Trawl Fishery is to transition into the Commonwealth SET, which will include allocation of Commonwealth quota to existing state operators. A review of the existing cross-jurisdictional stock assessment and management arrangements for this species is urgently needed to ensure sustainable fishing continues to occur.
Critical information gaps that are hindering this process include the uncertain stock structure of Eastern School Whiting, mixed species composition of whiting in northern NSW and representativeness of biological parameters currently used in the joint stock assessment. This collaborative project between Commonwealth and state agencies aims to fill these information gaps using state-of-the-art scientific methods to increase confidence in stock assessment outputs and help develop appropriate cross-jurisdictional management arrangements.