Seafood CRC: Increasing the profitability of Penaeus monodon farms via the use of low water exchange, microbial floc production systems at Australian Prawn Farms and at CSIRO
Evaluating the Southern Bluefin Tuna cell lines as a platform for testing the effectiveness of antioxidants in preserving flesh quality
The vast majority of the Southern Bluefin Tuna (SBT) farmed in South Australia is sold fresh for sashimi production in Japan. Premium prices are obtained for sashimi grade tuna with a high fat content. Unfortunately, fatty fish tissues with their high polyunsaturated fatty acid (PUFA) content are prone to oxidation. This results in poor flesh quality, reduced shelf life and significant trimming of the tuna carcass at the market.
FRDC Project No. 2004/209 investigated the impact of dietary supplements on the flesh quality of farmed SBT. Specifically, it investigated the impact of the dietary antioxidants vitamins C and E and the mineral selenium. Project No. 2004/209 showed that these supplements can extend the shelf life of muscle samples taken from farmed SBT fed diets containing higher than normal concentrations of the antioxidants.
Although Project No. 2004/209 has been very successful, performing diet trials with live SBT is expensive and logistically difficult. It is also time-consuming and the statistical power of the experiments is limited by the fact that it is economically unfeasible to have multiple replicate sea-cages for each dietary treatment. As a result of these constraints, experiments must be repeated over several years to obtain statistically valid results.
Recently, we produced the world’s first SBT cell line and to our knowledge the first cell line for any tuna species. The cell line has the potential to reduce the number of experiments with live SBT and to greatly increase the number of dietary supplements that can be screened in a given period of time. With the cell line, it takes only one week to screen 24 different supplements with 3-4 replicates of each. This compares with years for similar experiments with live SBT.
This project will evaluate the cell line as a platform for testing dietary antioxidant supplements for SBT.
Final report
SSA: The Next Generation (2007-2012)
There is a pressing national need to provide industry with services that complement and enhance those provided by peak sectoral bodies. The number and complexity of issues affecting global seafood trade will continue to increase along with the need for more rapid responses. Individual businesses and peak bodies cannot follow development in all of these areas: SSA can.
By focusing on industry development priorities and the adoption of R&D results, SSA can assist the FRDC to meet its 5 year targets and help to meet the expectations of the Australian government (see the National and Rural Research and Development Priorities and the response to the Corish Report).
FRDC investment is required to capitalize and build on SSA’s achievements and to continue to assist industry meet the challenges of sustaining seafood business profitability.
1. The need for stable supply of seafood – Australian seafood producers meet about 40 per cent of domestic demand at present, but if the status quo continues they are predicted to supply less than 25 per cent by 2020. Reducing business costs and increasing production efficiency will help close the supply/demand gap.
2. The need to sustain profitable markets – having the capacity to quickly respond to market signals and expand customer base by increasing demand for product in a broader range of markets.
3. The need to cost effectively deliver quality products to markets – collective approaches to product quality will underpin investment in branding and promotion and improve the capacity of the industry to consistently meet the expectations of premium price markets.
4. The need for access to timely and relevant expertise and knowledge – to be globally competitive Australia’s seafood businesses need access to and the capacity to use the best up to date knowledge and technology to achieve their business objectives.