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

More documents

Recommendations

Info

Report Recommendations 1. The veterinary investigation recommends an adverse event report process for the APVMA to be initiated in relation to beta‐cyfluthrin. This signals the need to conduct structured research into pesticide exposure and toxicity to aquatic species such as commercial fish because existing label regulations do not appear to safe guard against spray drift in certain situations of pesticide use identified in this report. Options for this research are presented in this report. 2. The veterinary investigation recommends on‐going structured surveillance into the Australian Bass deformity syndrome based on pathological confirmation that a significant early embryonic disorder is present with the potential to impact bass recruitment and replenishment in the Noosa River Catchment. Options for surveillance research are presented in this report. 3. The veterinary investigation recommends the development of a risk mitigation plan for the Sunland Fish Hatchery which is able to ensure sustainable production of valuable native Australian fish species. This plan should contain in its core requirement specific strategies to protect fish culture from inadvertant spray drift with pesticide chemicals. Options for risk mitigation are presented in this report. Report to Noosa Fish Health Investigation Task Force 7th Veterinary Report Executive Summary of Veterinary Investigations Page 8 of 27
Mullet Deformities Syndrome Mullet Deformities Syndrome (MDS) o Is a new and serious condition affecting the reproductive health of mullet fish in the Noosa River with a potential to alter the general mullet population recruitment rate. This is dependant on the prevalence of MDS in the mullet population. o Has significant similarites to the deformity syndrome described for Australian Bass from the Noosa River. o It would not be inconsistent to consider that the reason or risk factor for MDS to be the same as that for the deformities in Australian Bass fry of the Noosa River. The risk factor causes reproductive failure in both species. o Is caused by a non‐infectious agent(s) with potential genotoxic or mutagenic properties, being present in the ecosystem where mullet and bass co‐habitat. Exposure period(s) in the Noosa River may increase or decrease the risk of MDS in mullet. Case Definition – Mullet Deformities Syndrome (MDS) MDS is defined as a disorder of the reproductive health of Mugil cephalus currently detected in fish sourced from the Noosa River system. MDS is clinically presented as resulting in the failure of normal, full‐term development of fertilised mullet eggs from the stage of egg activation , through cell division, embryonic organogenesis and to hatch. The clinical signs appear to be more severe in mullet which commercial fishers consider to be Noosa River resident fish. Clinical signs and pathologies are variously presented as deformites of cell development (eccentric cells, halos, tophats) and deformities of organogenesis (axial duplication and axial triplication, dwarfs and snake forms) in the formed embryo. Clinical sign also appears to reflect an arrestment and/or an abortive effect on apparently fertilised eggs in the absence of visible deformities. The net result of MDS being a failure of effective reproduction from fish in normal spawning condition and in fish with no evidence of significant disease from viral, bacterial, fungal, parasitic or chlamydial pathogens. MDS appears to be independent of husbandry factors . The recommendations of this report are – A. Fish surveillance program to – o Monitor the impact of MDS to mullet and of two headed deformity to Australian Bass populations by comparing Noosa to non‐Noosa fish in fish breeding trials. o Surveillance of recruitment rates of mullet and bass in the Noosa river over a period of several years. B. Agrichemical exposure trials to ‐ o Understand the genotoxic and mutagenic effects of agrichemicals detected in the Noosa catchment to fish reproductive performance. o Assess the toxicity levels of carbendazim and atrazine to reproductive performance of Australian Bass and mullet in controlled experimental conditions. Report to Noosa Fish Health Investigation Task Force 7th Veterinary Report Executive Summary of Veterinary Investigations Page 9 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: toxic level of beta‐cyfluthrin wh
Page 11 and 12: B. As the hatchery is a commercial
Page 13 and 14: Summary Risk Assessment Statement T
Page 15 and 16: The recommendations of this report
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 ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?