Australian fisheries, including trawl fisheries, need to ensure they met legislative requirements to ensure they have no unacceptable impacts on ecosystems. Similarly, the marine ecosystems and its biodiversity need to be conserved and protected. This project links across sustainability and conservation management objectives by building and extending previous works such as FRDC 2003-021 and FRDC 2016-039, works that provide/establish regional and national regionally relevant clarification of the seabed mapping and landscape-scale fishing footprints, and exposure and protection of demersal assemblages with respect to trawling.
Although significant bycatch data are available (mostly for fishes) for some trawl grounds in the region, such data are needed broadly across the study area (including for invertebrates) and there is almost no information on the distribution and abundance of habitats and sensitive habitat-forming benthos. Currently, this lack of adequate biological data is an impediment to completing bycatch and habitat ERAs for these priority areas. Thus, a pre-requisite need is to survey these areas for distribution and abundance of sensitive habitats and bycatch species.
This project will then fill the existing gaps and needs in the southern portion of QLD and north-eastern of NSW with new data & methods and new risk-based management assessments to implement a consistent spatial approach for the conservation management of demersal assemblages applying to all continental shelf trawl fisheries. This will be done in collaboration with researchers in each State, industry and commonwealth managers.
This project proposes to conduct the required distribution and abundance surveys, and then assess whether sensitive habitats and bycatch species are at substantive risk from trawling. If necessary, the project would also evaluate risk-management options that may be proposed, using an objective MSE-type approach. Methods and outputs proposed herein would be comparable with those from the previous GBR Seabed Project (FRDC 2003-021). Previous sampling in the GBR, southern Queensland and northern NSW, would be taken into account.

This project is directly aligned with the FRDC’s national research priority ‘Developing new and emerging aquaculture growth opportunities’. The demonstrated interest from a number of parties in tropical oyster aquaculture makes them well placed as candidates for the FRDC’s target of advancing ‘two or more emerging aquaculture species’. However, the lack of robust scientific names is problematic for the developing tropical rock oyster industry in several ways.

Firstly, it creates problems for regulation, for example, with permits and licences being issued under species names that are likely incorrect. For example, the tropical black-lip oyster is often referred to as Saccostrea echinata, however this name almost certainly correctly designates a smaller, spined oyster that also exists within Australia, but with a much broader range than the tropical blacklip. This issue needs to be resolved urgently to avoid confusion between farmers and regulators in the future.

Secondly, it impedes industry development, i.e., in Queensland, where there is reluctance to allow farming of new species until their true species identity and distribution is ascertained (John Dexter, Fisheries QLD, pers. comm.).

Thirdly, confusion regarding species may also lead to inefficiencies in improvement of production, as hatchery practices developed for one species may be incorrectly applied to another that is mistakenly thought to be the same.

Therefore, a revision of the taxonomy of these oyster species is urgently required.