Establishing a Sydney Rock Oyster aquaculture industry in the Gippsland Lakes in partnership with the Gunaikurnai Land and Waters Aboriginal Corporation (GLaWAC)
The Gunaikurnai Land and Waters Aboriginal Corporation (GLaWAC) is exploring aquaculture development opportunities on country and in partnership with the VFA have commenced a small pilot trial of Sydney Rock oyster aquaculture in the Gippsland Lakes in October 2022, the preliminary results from the first 12 months of the trial have been very positive, the partners would like to move the project to the next stage to prove commercialisation.
The Victorian Government and GLaWAC are looking for on-country opportunities that show positive commercial potential for the Gunaikurnai one of the main aims of the trial is for GLaWAC to be in a position to make an informed business decisions at its conclusion on the best business development model and how to move the project to full commercialisation, this is most likely with an existing aquaculture business as a business partner.
SRO were chosen for this project as they are native and endemic in the Gippsland Lakes and have an established market and growing systems. Other species that were considered were Native flat oyster (Ostrea angasi) and the introduced species Pacific oyster (Crassostrea gigas) which are both present in the Gippsland Lakes only Native flat oyster (Ostrea angasi) have been approved for aquaculture production in Victoria. While Native flat oysters (Ostrea angasi) would be an option in the Gippsland Lakes the lack of proven markets and established growing systems was considered high risk, However, Pacific oyster (Crassostrea gigas) have not been approved for aquaculture in Victoria as they are not native and they are considered a invasive species which ruled them out as an option as they would not meet the bush food ethics and direction of Gunaikurnai people, the recognised native title holders of the Gippsland Lakes area.
With the success of the first year of the pilot trial, GLaWAC and the VFA have agreed to move the project to stage 2, which will establish semi-commercial scale plots to investigate the full commercial potential of SRO aquaculture in Eastern Victoria. This stage 2 trial will also provide employment, training and skills development for the Gunaikurnai people.
The trial will involve the establishment of approximately 1 hectare of oyster aquaculture infrastructure across seven replicated trial sites in the Gippsland Lakes (in the general area of the existing pilot trial) and will investigate and compare production in different oyster culture systems.
The project has involved extensive consultation with the seafood industry and aquaculture sector and the pilot project has been strongly supported by the Oyster industry and seafood industry. The pilot project also involved cross sector and community consultation with key stakeholders and the broader community.
Successfully developing a SRO aquaculture industry in eastern Victoria will benefit GLaWAC and the Gunaikurnai people, the broader seafood and aquaculture sectors, and local businesses including transport, tourism, hospitality and other support industries.
The project is of regional and national importance as it meets four of the priority areas of the National Fisheries Plan
• First Nations employment in the sector Key initiatives: 4.2, 7.1
• Sustainable development of the aquaculture sector Key initiatives: 2.6
• Employment, participation and health in the fishing, aquaculture, and seafood sectors Key initiatives: 7.1, 7.2, 7.3, 7.4
• Climate change and adaptation - shifting and shared stocks Key initiatives: 6.2, 6.3, 6.4
There is significant interest across Australia from first nations people to become involved in viable aquaculture ventures. This project aims to develop a new aquaculture industry using an established and marketable product in an area of Australia that is on the current margins of commercial SRO production.
Climate change is already increasing east coast water temperatures and extending the southern range of a number of species. These changes are likely to increase the potential for SRO aquaculture production in Eastern Victoria.
This project also aims to investigate the potential of a viable new first nations aquaculture industry on the Gippsland Lakes. The initial pilot project on which this application is based has shown that the growth and survival of SRO is commercially viable and as the Gippsland Lakes is a large waterway with no aquaculture industry, there is significant potential for a large commercial development based on SRO production in the area to support a regional aquaculture industry and local employment.
2020-2025 Strategic Plan for the Australian Oyster Industry
Understanding Ostreid herpesvirus type 1 risk: alternative hosts and in situ hybridisation
Survey of Enterprise-level Biosecurity across the Australian Aquaculture Industry
Future Oysters CRC-P Communication and Adoption
Future oysters CRC-P: Species diversification to provide alternatives for commercial production
The establishment of a new native oyster and/or western rock oyster aquaculture sectors in SA and the former in Tasmania will not only diversify the business risk of the existing Pacific oyster sector, but has the potential to become a multi-million dollar industry itself. As native oysters would be more suited to subtidal or low intertidal culture while western rock oysters are an ideal alternative species to mitigate POMS, the successful development of these aquaculture sectors will strengthen the confidence of existing/new growers and investors in Pacific, western rock and native oysters; thereby encouraging further expansion of the industry. In addition, supporting species diversification is one of the high strategic priorities in the Oysters Australia Strategic Plan 2014-2019.
Final report
Future oysters CRC-P: Polymicrobial involvement in OsHV outbreaks (and other diseases)
During the last two decades a number of disease outbreaks have led to mass oyster mortalities and the closure of several oyster-harvesting regions, resulting in multi-million dollar losses. These outbreaks mirror a global pattern of increased aquaculture disease, with disease emergence potentially linked to environmental degradation (pollution) and climate change related processes, such as rising seawater temperature. Within NSW estuaries, multiple microbiological agents have been implicated in oyster diseases, but a clear understanding of the ecological and environmental drivers of disease outbreaks has remained elusive. This means we cannot predict when outbreaks will occur, making it very difficult to manage infection events and develop strategies to mitigate future oyster disease events.
Since 2008, Pacific Oyster fisheries in several parts of the world have been decimated by the influence of Pacific Oyster Mortality Syndrome (POMS), resulting in high (>95%) rates of juvenile oyster mortality. Recent evidence indicates that POMS is a polymicrobial syndrome, that is not only caused by the OsHV-1 virus, but includes the involvement of pathogenic bacteria from the Vibrio genus, a bacterial group comprising species that cause disease in a diverse range of marine animals and which is responsible for significant mortality in a variety of aquaculture industries. However, our understanding of this complex interaction is limited.
This project will provide valuable insights into the microbial communities associated with oysters, how those communities vary and how they might influence the course of other diseases. The project will also indicate whether breeding influences the microbial communities associated with oysters and whether this is influencing the impact diseases like OsHV is having on different Pacific oyster families.
Final report
future efforts hoping to employ the oyster microbiome for diagnostic purposes.
Future oysters CRC-P: New Technologies to Improve Sydney Rock Oyster Breeding and Production
The hatchery sector for SRO is still developing and any assistance with its underlying operating challenges or potential increases to its seed market significantly improve the prospects for its continued development.
Tetraploid SRO: Triploid SRO can grow up to 30% faster than normal SRO and commonly have a significantly longer marketability window. Accordingly, many framers have eagerly awaited the supply of more triploid seed. In order for this to occur new techniques that overcome the shortcomings of direct induction are required - techniques that don't involve the direct application of harmful chemicals to what will eventually be a foodstuff.
Gamete preservation: Currently techniques for strip spawning SRO gametes typically results in the destruction of valuable broodstock and the collection of many more gametes than are required immediately. The capacity to simply and cheaply store gametes for relatively short periods of time offers a number of advantages. Once the hatchery operator is satisfied with the performance of gametes (usually apparent within hours to days) gametes could be shared with other hatcheries. This is particularly valuable where brood stock are scarce because of time of year or they are from a limited population in a breeding program. If problems occur, stored gametes could be used to commence a second batch without the need to continue to hold and feed broodstock, or to recreate a particular cross (or new crosses) within a breeding program.
Maturation: SRO broodstock can take up to 10 weeks to bring into condition within a hatchery and can consume up to 80% of the algae required for a hatchery production run - this is both time consuming and expensive. Technology that accelerates reproductive condition and then stimulates spawning on demand could significantly reduce these costs.