37 7th Veterinary Report - Department of Primary Industries ...

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Australian Bass Growth Retardation Syndrome 1. The Australian Bass Growth Retardation Syndrome (ABGRS) is a significant fish health disorder impacting the productivity of the Sunland Fish Hatchery. ABGRS is now a verifiable condition under the terms of reference of the Noosa Fish Health Investigation Task Force (NFHITF). 2. ABGRS manifests itself when fish are reared in a pond subjected to agrichemical spray drift risk during spray application events by the adjacent macadamia plantation. The period of potential exposure in this study was from 25.11.09 until the 10.2.2010, the period when fish were stocked into the Barra pond until the time of sampling and fish measurements. Evidence of contamination of the barra pond specifically and also the hatchery internal environment and other water storages at Sunland Hatchery (Gilson Rd.) with nonylphenol was established. As nonylphenol has been used by the adjacent macadamia plantation, the source of this agrichemical is likely to be the adjacent macadamia plantation unless, audited spray record information and environmental sampling and testing of the macadamia plantation show contrary evidence – ie absence of use and lack of detectable presence on soil, water or foliage of the plantation. 3. ABGRS resulted in a statistically significant (P
The recommendations of this report are : A. To prevent the recurrence of Australian Bass Growth Retardation Syndrome (ABGRS), fish must be fully protected from proximity to all spray activity in time and distance during their entire grow‐out period. This may be achieved by relocating all grow‐out activities to several kilometres away from the Gilson road location. B. Published data on the toxicity of nonylphenol agrichemical is not currently available to native Australian fish species. This makes practical risk assessment currently unreliable and can result in occurences of adverse events such as ABGRS. As a priority, research into the toxicity threshold of nonylphenol for native Australian fish species, including the Australian Bass is indicated. To achieve this end, an Adverse Event Report (AER) on nonylphenol to the APVMA is justifiable. Direct tank exposure trials with known dilutions to levels below current published toxicity endpoints would be useful to minimise setting no observable toxic effect levels that are too high. Tools for measuring toxic effects need to be more specific and sensitive, aimed at capturing mechanisms of toxicity at the cellular and sub‐cellular level. Tools such as biochemistry and cell‐line studies are relevant in this regard. C. Risk modelling of spray application scenarios that use the agrichemical nonylphenol as a surfactant or wetting agent based on actual operational situations of application is required to quantity more accurately the exposure concentrations to fish species. This should replace the current approach of grab water samples to estimate exposure, primarily to minimise error of underestimation of exposure concentration. Report to Noosa Fish Health Investigation Task Force 7th Veterinary Report Executive Summary of Veterinary Investigations Page 15 of 27
Page 1 and 2: Report to Noosa Fish Health Investi
Page 3 and 4: Veterinary Investigations Executive
Page 5 and 6: Develop effective tools for sensiti
Page 7 and 8: toxic level of beta‐cyfluthrin wh
Page 9 and 10: Mullet Deformities Syndrome Mullet
Page 11 and 12: B. As the hatchery is a commercial
Page 13: Summary Risk Assessment Statement T
Page 17 and 18: B. Nonylphenol, though not a pestic
Page 19 and 20: 14.12.09 10.2.2010 6.1.2010 09‐1
Page 21 and 22: Ferguson, H.W. (2006). Systemic Pat
Page 23 and 24: NRA (2002). Public Release Summary
Page 25 and 26: Weiss, S.J. (1989). Tissue destruct
Page 27: Troy Ziesemer Roger Arbuckle Gwen G

37 7th Veterinary Report - Department of Primary Industries ...

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