Title:

Development of management recommendations to assist in advisories around seafood safety during toxic bloom events in Gippsland Lakes

Project Number:

2013-217

Organisation:

University of Melbourne

Principal Investigator:

Vincent Pettigrove

Project Status:

Completed

FRDC Expenditure:

$200,000.00

Program(s):

Industry

Need

In recent years there have been extensive blooms of the blue-green alga Nodularia spumigena, prompting advisories regarding the sale and consumption of fish and shellfish. In 2011-12 these advisories lasted up to 6 months in order to protect human health from consumption of contaminated seafood, and led to large economic losses to the commercial fishery and tourism in the region. The inability to accurately predict occurrence of blooms and closures before they occur, are detrimental to businesses in the region. The increased occurrence of N. spumigena in the Gippsland Lakes has also led to increasing stress on government agencies responsible for protecting public health and providing timely, accurate information to citizens, policymakers and local businesses. Increased monitoring during blooms has significantly raised costs; with agencies under pressure to act on limited information and funding. Black bream currently act as a sentinel species to provide early warning. However there is no information on the elimination of nodularin in this species or other key species. These are needed to provide better focus and economy to monitoring efforts. Regulatory sampling could benefit greatly if toxin elimination kinetics were known so that temporal sampling regimes could be designed and further confidence provided surrounding advisories and parts of the fish that remain marketable during blooms. The lack of understanding of nodularin elimination and tissue distribution in fish from the Gippsland Lakes are significant stumbling blocks to the provision of management strategies to deal with seafood contamination during blooms. Clearly, there is a strong need for strategies that will enable local-, and state agencies to work together in developing early warning systems to detect and monitor seafood contamination and potential closures, which makes it possible to develop realistic mitigation strategies that minimize the risks to human health and reduce the economic impacts to government and industry.

Objectives

1. Determine uptake, elimination and tissue distribution of nodularin in commercially and recreationally relevant species under laboratory and field conditions.

2. Review current algal bloom response plan for the Gippsland Lakes and those used in monitoring programs in Australia and around the world.

3. Provide sampling and risk management recommendations, based on scientific and research findings from objectives 1 & 2, to deal with fishing closures and re-opening during bloom events.

Development of management recommendations to assist in advisories around seafood safety during toxic bloom events in the Gippsland Lakes

Report
ISBN:Not provided
ISSN:
Author(s):Jackie Myers and Vincent Pettigrove
Date Published:January 2018
Over the last 4 years, scientists from the Centre for Aquatic Pollution Identification and Management (CAPIM) have been leading a research program to better understand the risks to seafood safety during toxic cyanobacterial blooms in the Gippsland Lakes and best practices for monitoring and managing these risks. The program has successfully generated a number of recommendations to assist in providing advice around seafood safety and to deal with restrictions around harvesting during blooms not only in the Gippsland Lakes, but on a national scale
 
Based on the outcomes from the experimental research and Gippsland Lakes response plan review, a number of recommendations are provided which would assist in advisories and monitoring and management of seafood safety in the Gippsland Lakes during toxic blooms. These include:
• Develop and implement a comprehensive response plan that is based on internationally respected risk assessment principles and a scientifically sound management framework.
• Develop an appropriate cost sharing agreement so as funding will be available each year in the event of a bloom. Funding needs to be available to be deployed for sampling and toxin analysis.
• Undertake further research into uptake, tissue distribution and elimination of nodularin under field conditions in a greater number of finfish species of commercial and recreational significance to better understand risks and select an appropriate sentinel species
• Undertake further laboratory and field assessment for other toxins to fully evaluate food safety risks.
• Investigate other methods which could help in monitoring of toxins during blooms