In FRDC 2007/007 and FRDC 2009/044, it was determined that ornamental fish entering Australia are a source of exotic pathogens, such as cyprinid herpesvirus 2 (CyHV2). This is of particular relevance for goldfish, where domestic breeders claim that their stock succumb to CyHV2 disease when brought into contact with imported goldfish in wholesale and retail premises. CyHV2 only affects goldfish and was addressed in the 1999 IRA as being exotic to Australia. Recent research findings from FRDC 2009/044 indicated that CyHV2 is present in domestic Australian goldfish populations. On 1 September 2011, Biosecurity Australia amended the health certification requirements for the importation of goldfish and no longer requires fish to be certified free of CyHV2.

The detection of CyHV2 and other exotic aquatic pathogens (e.g. gourami iridovirus) was achieved through the application of molecular techniques, such as PCR. Correctly applied and interpreted, molecular approaches offer unique opportunities to understand the local and global spread of a disease. The advancement of molecular approaches is required to safeguard Australia against pathogen incursions through the processes of informed policy development and import risk analysis.

There is a need to disseminate the research that determined that CyHV2 is now established in Australia and how scientific evidence was used to change national biosecurity policy to the international scientific community. There is also a need to ensure the availability of people with specialised training in molecular epidemiology in Australia to stay at the forefront of the application of this technology.

Through existing farming practices it is apparent that there are several factors which may be limiting production and ultimately revenue.

Firstly, there is a need to identify an “ideal production strategy” to achieve forecast production levels. As temperature significantly affects YTK growth, feed conversion ratios and health, it is essential that the relationship between growth and temperature is investigated in fish of various sizes. This information will enable CST to make informed decisions on size and time of stocking YTK into sea cages. It is anticipated that this will improve production through shortening the production cycle and will reduce the standing biomass in the water, ultimately increasing farm profitability.

Secondly, maturation may be a constraining factor in YTK production, reducing somatic growth. There are also flesh quality concerns which threaten sales of YTK harvested in November-December, a period when males exhibit maturation. However preliminary analysis of work carried out in Seafood CRC project 2008/901 suggests that male maturity did not have a significant deleterious effect on the flesh quality at that time. Though there are numerous strategies to manage maturation it is initially necessary to characterise the occurrence of maturation and the factors controlling it. With this information, appropriate mitigation strategies can be introduced resulting in economic benefits to the YTK industry.

Lastly, as production is poised to increase, it is imperative that substantial markets are developed for YTK product. One way of increasing sales is to ensure product sold is consistently of the highest possible quality. By attaining knowledge on the quality attributes, shelf-life and nutritional content of the product, producers will be able to tailor a product to specific market requirements. Likewise, as processing techniques and cold chain supply routes are diverse, it is imperative that information is attained on how these influence the quality of the product.

Through existing farming practices it is apparent that there are several factors which may be limiting production and ultimately revenue.

Firstly, there is a need to identify an “ideal production strategy” to achieve forecast production levels. As temperature significantly affects YTK growth, feed conversion ratios and health, it is essential that the relationship between growth and temperature is investigated in fish of various sizes. This information will enable CST to make informed decisions on size and time of stocking YTK into sea cages. It is anticipated that this will improve production through shortening the production cycle and will reduce the standing biomass in the water, ultimately increasing farm profitability.

Secondly, maturation may be a constraining factor in YTK production, reducing somatic growth. There are also flesh quality concerns which threaten sales of YTK harvested in November-December, a period when males exhibit maturation. However preliminary analysis of work carried out in Seafood CRC project 2008/901 suggests that male maturity did not have a significant deleterious effect on the flesh quality at that time. Though there are numerous strategies to manage maturation it is initially necessary to characterise the occurrence of maturation and the factors controlling it. With this information, appropriate mitigation strategies can be introduced resulting in economic benefits to the YTK industry.

Lastly, as production is poised to increase, it is imperative that substantial markets are developed for YTK product. One way of increasing sales is to ensure product sold is consistently of the highest possible quality. By attaining knowledge on the quality attributes, shelf-life and nutritional content of the product, producers will be able to tailor a product to specific market requirements. Likewise, as processing techniques and cold chain supply routes are diverse, it is imperative that information is attained on how these influence the quality of the product.