Seafood CRC: The advancement of reproductive development in Southern Bluefin Tuna using hormonal manipulations of kisspeptin, the gatekeeper of puberty
Seafood CRC: The advancement of reproductive development in Southern Bluefin Tuna using hormonal manipulations of kisspeptin, the gatekeeper of puberty
Seafood CRC: The development of a genetic management and improvement strategy for temperate marine finfish (Southern Bluefin Tuna, Yellowtail Kingfish & Mulloway)
Seafood CRC: Yellowtail kingfish juvenile quality: Identify timing and nature of jaw deformities in yellowtail kingfish and scope the likely causes of this condition
Seafood CRC: Southern Bluefin Tuna (SBT) Maturation and Sexing; develop and apply new technologies
Seafood CRC: Resolving larval rearing, juvenile development and productivity constraints for propagated Southern Bluefin Tuna. Improvements to the production of Yellowtail Kingfish and Mulloway.
Seafood CRC: broodstock and genetic management of Southern Bluefin Tuna and Yellowtail Kingfish
SBT:
There is a need to better identify the relationship between hormonal treatment and spawning performance as this will determine the hormonal manipulation strategy. There is also a need to better
understand factors associated with broodstock mortality, as currently 30% of the broodstock die every year and thus need to be replaced.
We need to develop methods of ensuring that all females participate in spawning every year and how to extend the spawning cycle to have eggs for four months of the year.
There is a need to advance the initiation of spawning to October (from the current norm of February) so that the fingerlings are ready to be transferred to sea cages sufficiently early in the calendar year for optimal seawater temperatures.
SBT broodstock reach spawning age at about 12 years of age. There is therefore a need to examine alternative technologies and approaches to obtain tuna seed from younger fish.
YTK:
This genetic management and selection project is needed to maintain a commercial advantage in a highly competitive market and as a management tool to prevent inbreeding.
It is difficult to source wild YTK broodstock, and the current stock are getting older and larger. There is a need to source new broodstock, and it will be advantageous to use selected F1, provided they can be genetically managed.
Pilot scale trial to assess benefits of remote sensing technology to optimise fishing efficiency of tuna ranching operations
Minor use permit to sedate finfish using APVMA registered products containing isoeugenol
Long-term analysis of the sea-state in the Great Australian Bight
Seafood CRC: yellowtail kingfish health workshop and feed analysis
The long term viability of Yellowtail Kingfish production is in question given the significant and unprecedented health issues Cleanseas has experienced in recent times. This is demonstrated by the fact that the cumulative mortality is presently 39.2% in the 2011 year class and 37.71% in the younger 2012 year class. Though the primary cause for poor fish performance remains unclear, disease investigations conducted but Future Fisheries Veterinary Services have provided insight in to the disease picture. It is known that the disease picture is different between the year classes and investigations have found a mixture of disease agents, a high occurrence of intestinal disease and abnormalities, lesions and inflammation of major organs. Given the complex and potentially multifactorial nature of the disease picture CST seeks the advice from experts in the field of fish nutrition, pathology, aquatic health, enteritis, virology, and protozoan parasitology. To this end, CST wishes to hold a workshop to review the information gathered thus far in order to develop remedial strategies for immediate implementation. The workshop will also formulate a disease investigation plan to elucidate the cause of its disease issues. In addition to the workshop, CST wishes to conduct nutritional analysis of its diets as dietary factors maybe a significant contributor to the disease profile being observed.
Final report
This project addressed the need to further CST's understanding of the disease issues severely impacting YTK production. It also provided an environment to share ideas and peer review CST's approach to dealing with the outlined case history and its proposed remedial strategies and R&D activities. As a consequence of this project, CST is significantly more confident that it is dealing with a nutritional deficiency that has resulted in immuno-disregulation