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• Coping with the potential persistence of WSSV in Australian waters
It is important for farms in the WSD risk region, as well as those outside it, to have access to the necessary tools and reliable information that enables them to implement highly effective biosecurity measures when they become necessary.

• Industry white spot disease preparedness
Chemical treatment to remove residual vectors and/or destroy the pathogen is currently the only practical approach with potential to adequately reduce WSD biosecurity risk associated with influent farm water. When assessment indicates a high disease risk, farms will need to be confident that their biosecurity measures will be immediately effective.

• Appropriate guidelines for using trichlorfon
Currently there is no locally generated guideline for achieving effective application of trichlorfon that is based on directly applicable experimental data and prawn farm experience. The industry needs a set of guidelines that expand upon the basic APVMA use conditions and define the environmental factors and application parameters that will provide the greatest protection for Australian farm conditions.

• Gaps in information currently available
The available information does not provide substantiated details of trichlorfon treatment methods and outcomes. The Australian industry needs validated treatment methods and their effectiveness and biosecurity outcomes verified.

• Constraints on trichlorfon use during production
Using trichlorfon to treat top-up and exchange water during the production cycle is problematic for some farms due to the 12 day conditioning period required to ensure toxic residues are below the detectable limit before stock is exposed to the water. The potential to manipulate water quality parameters to accelerate residue degradation could make treatment throughout the cycle a more practical option.

• Continuation of permit to use trichlorfon
Documented evidence of outcomes and impacts of trichlorfon use on farms is needed to support an APVMA application to extend its use beyond the current MUP period ending 31 December 2021.