Most jurisdictions have developed and used various combinations of indicators in stock assessment and TAC setting of their abalone fishery. Applications often use a time series of commercial catch rate or FIS density to detect trends and identify reference points of stock status. The use of fishery dependent indicators from logbooks and GPS loggers have been criticized for their potential to be biased and insensitive (‘hyper-stable’) because of commercial selection of all observations that are made. As a consequence, Fishery Independent Surveys (FIS) have also been used in stock assessment, with varying coverage in all state’s abalone fisheries. However, FIS have also been criticized for their large cost and considerable uncertainty about how representative and useful the data is for intensely spatially-structured abalone fisheries (e.g. spatial mismatch of the FIS and the stock). FIS reviews in several states found variable relationships between FIS estimates and other indicators of the fishery.

Alternatively, both GPS loggers and FIS have considerable complementary strengths. GPS logger information has strengths of extensive fine-scale detail about catch (e.g. allowing spatial standardisation, that represents one of the main challenges to fishery dependent data) with good coverage of the fishery, while FIS have strengths of repeatable and local scale detail that is independent of the fishery.

The project will review data available from GPS loggers, catch records and FIS in WZ Victoria, with possible extension to other fisheries depending on data access and funding. Methods to calculate density and biomass from different sources of data will be consolidated and applied at different spatial scales, and the precision and statistical coherence of estimates compared. These comparisons will enable the development of criteria to improve design of FIS, logger programs and related observations, and recommendations and guidance on the use of indicators of legal density and biomass in fishery harvest strategies.

Stock enhancement and restocking of marine species is an ever-evolving field given the development of new technology and pressures put on species by factors such as fishing, environment and disease. In Australia there have been several large-scale experimental abalone projects conducted, primarily in NSW and WA, with promising results and conclusions. However, these research projects have cost just over $1.7 million and none of the outcomes have translated into commercial-scale abalone stock enhancement, restocking or translocation. Even so, there is still considerable and continuing interest in stocking where stocks are so depleted as to render recovery without intervention impossible. The question is therefore, why do very few ideas/proposals progress to R&D projects and none have progressed to commercialisation?

This project will review abalone stocking in Australia and jurisdictions current strategic direction and management policies. Through this, potential roadblocks to the commercialisation of abalone stocking in Australia, such as government policy, scientific research, aquaculture practices, genetics and biosecurity/disease will be investigated. At present there is no formal abalone stocking programmes being conducted in Australia, even with the stock declines present in numerous fisheries. However, several major projects have been proposed and the interest in stocking as a fisheries management tool has remained high with substantial investments made. A national approach to abalone stocking will allow regulatory bodies to decide on appropriate stocking programmes and for industry to have confidence in the benefits for the fishery.