The health and longevity of fisheries depend on access critical habitats appropriate to each particular life-history stage. While many key fisheries habitats are under threat from rapidly increasing coastal development, management of those habitats is severely hampered by very poor understanding of these life history-stage habitat requirements. This not only prevents effective management of critical fisheries resources but hampers the ability to direct development to enhance, rather than degrade fisheries value. At the moment many management and offsets actions are unsatisfactory to all users because they are based on incomplete understanding of fish-habitat relationships. This means actions and offsets rarely product tangible gains in ecosystem health or biodiversity, frustrating fishers, environmentalists, developers and governments alike. Not only can carefully designed developments provide new areas of critical habitat to replace habitats damaged in the past, but the opportunity exists for directing mandatory offsets from new coastal developments towards beneficial fisheries outcomes. This would provide the basis for greatly improved management of coastal fisheries habitats and would help to direct effective offset strategies, assist in directing fisheries friendly infrastructure design, and allow the development of metrics appropriate to the definitive measurement of specific fisheries outcomes from particular offset actions. Consequently, improved understanding of stage-specific habitat requirements of fisheries species is central to both the long-term health of fish stocks and fisheries productivity, and the effective management of coastal development to enhance fisheries values.

In 2012, diseased P. monodon from North-QLD farms were investigated by QDAFF, Townsville. All prawns tested negative using an OIE-endorsed YHV-1 specific PCR test but positive to GAV (YHV-2) and to YHV-1 using OIE-endorsed nested PCR tests designed to co-detect and differentiate YHV-1 from GAV. However, consistent with the YHV-1 specific PCR test data, none of the diseased P. monodon displayed histopathology consistent with acute YHV-1 infection.

Analyses undertaken at CSIRO-AAHL confirmed the presence of GAV but not YHV-1. In two OIE-endorsed PCR tests, GAV sequences were also amplified by primers supposed to be specific for YHV-1. When an OIE-endorsed PCR test designed to detect all YHV genotypes was applied to tissue from healthy P. monodon broodstock imported into QLD from NT, sequence analyses identified an undescribed unique genotype designated tentatively as YHV-7. YHV-7 was also amplified by a CSIRO in-house real-time PCR test designed to be specific to the YHV-1.

Wild QLD broodstock are increasingly being replaced by wild NT broodstock to produce resilient fast growing P. monodon for aquaculture. The finding of YHV-7, with unknown pathogenic potential and distribution, highlights the potential risks of translocated broodstock spreading unwanted new pathogens to regions with substantial aquaculture interest, and supports a need to update decade-old data on what viruses might exist in NT and QLD populations of P. monodon.

Collectively these discoveries highlight urgent needs to (i) re-evaluate genotype specificities of OIE-endorsed PCR tests for different YHV genotypes (ii) redesign PCR tests to improve their power to discriminate YHV-1 from less virulent genotypes and (iii) re-assess the prevalence of GAV and related genotypes (YHV-7) and other endemic viruses potentially problematic to aquaculture (MoV, MBV, HPV, SMV, IHHNV) in wild P. monodon broodstock sourced from the NT and QLD.

Given the iconic nature of the Point Lowly cuttlefish population there is a need to provide a robust assessment of its annual status to inform management and the general public. Currently, management has initiated a spatial closure for upper Spencer Gulf (North of Wallaroo) as a precautionary measure to ensure that the cuttlefish population is not unnecessarily compromised by commercial and recreational fishing. Although, fishing has not been specifically identified to detrimentally affect the population it was the most amenable factor to control. It is therefore important to assess the relative status of the Point Lowly cuttlefish population to inform management and assist in the development of the most appropriate management strategies. Quantifying cuttlefish by-catch in association with this closure will provide greater resolution in regard to fishing pressure.

There is also a need to determine whether there are alternate spawning grounds for the Giant Australian cuttlefish in northern Spencer Gulf to determine the relative conservational significance of Point Lowly and whether other areas within the region may require additional management consideration. It is clear that cuttlefish aggregate on the reef fringing Point Lowly, however, the specific characteristics and preferred dimensions of their dens and spawning substrate is unknown. For example, the preferred orientation, surface texture, depth range and exposure of natural spawning dens is not understood. Also there is a requirement to understand whether coastal pollutants play a role in shaping the distribution and relative abundance of aggregating cuttlefish. This level of information is required prior to the development and deployment of artificial spawning habitat that may be required to either mitigate habitat loss in the future or promote spawning in other areas where the habitat may be limited.

The FRDC, WAFIC and MSC have undertaken public perception studies on the support of fishing activities that have shown that the industry has a very low level of support. The Australian public simply does not believe the message given to it by industry and Government. Western Australia has recognised that the very survival of wild-harvest fisheries depends on a paradigm shift in this negative perception and only a credible, internationally recognised, third-party certification of the State's fisheries will alter the perception and provide industry with the level of security to invest in its future.
The $14.56 million earmarked for third party certification will be split as following: $6.56 million for MSC pre-assessment, full assessment and initial audit and; $2 million per year over 4 years ($8 million) to support Department of Fisheries research and management inputs to the certification process. If the benefits of this investment are to be fully realised for the State and the industry there must be investment in community and industry engagement, and engagement with the post-harvest sector through to the retail and food service. Without such engagement the benefits of certification will not be fully captured. This will require research and testing of cost effective mechanisms to effectively engage. The project builds on the substantial investment by the FRDC in research for Ecosystem Based Fisheries Management. The project will also link with other FRDC activities nationally like the Key Stock Status Report and the trial of the NSW Responsible Fisheries Management Certification project. The whole program of activities in WA that include: A new fisheries Act; MSC certification; and support for FRDC’s marketing function are singularly the largest changes being implemented by a fisheries jurisdiction to improve the future outlook for both capture fisheries and aquaculture.