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Field validation of the southern rock lobster paralytic shellfish toxin monitoring program in Tasmania, Australia

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Turnbull, A ORCID: 0000-0001-5701-8728, Dorantes-Aranda, JJ ORCID: 0000-0003-1513-6501, Madigan, T, Jolley, J, Revill, H, Harwood, T and Hallegraeff, G ORCID: 0000-0001-8464-7343 2021 , 'Field validation of the southern rock lobster paralytic shellfish toxin monitoring program in Tasmania, Australia' , Marine Drugs, vol. 19, no. 9 , pp. 1-15 , doi: 10.3390/md19090510.

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Abstract

Paralytic shellfish toxins (PST) are found in the hepatopancreas of Southern Rock Lobster Jasus edwardsii from the east coast of Tasmania in association with blooms of the toxic dinoflagellate Alexandrium catenella. Tasmania’s rock lobster fishery is one of the state’s most important wild capture fisheries, supporting a significant commercial industry (AUD 97M) and recreational fishing sector. A comprehensive 8 years of field data collected across multiple sites has allowed continued improvements to the risk management program protecting public health and market access for the Tasmanian lobster fishery. High variability was seen in toxin levels between individuals, sites, months, and years. The highest risk sites were those on the central east coast, with July to January identified as the most at-risk months. Relatively high uptake rates were observed (exponential rate of 2% per day), similar to filter-feeding mussels, and meant that lobster accumulated toxins quickly. Similarly, lobsters were relatively fast detoxifiers, losing up to 3% PST per day, following bloom demise. Mussel sentinel lines were effective in indicating a risk of elevated PST in lobster hepatopancreas, with annual baseline monitoring costing approximately 0.06% of the industry value. In addition, it was determined that if the mean hepatopancreas PST levels in five individual lobsters from a site were −1, there is a 97.5% probability that any lobster from that site would be below the bivalve maximum level of 0.8 mg STX equiv. kg−1. The combination of using a sentinel species to identify risk areas and sampling five individual lobsters at a particular site, provides a cost-effective strategy for managing PST risk in the Tasmanian commercial lobster fishery.

Item Type: Article
Authors/Creators:Turnbull, A and Dorantes-Aranda, JJ and Madigan, T and Jolley, J and Revill, H and Harwood, T and Hallegraeff, G
Keywords: marine biotoxin, non-traditional vector, Jasus edwardsii, lobster, uptake, depuration, risk management
Journal or Publication Title: Marine Drugs
Publisher: MDPIAG
ISSN: 1660-3397
DOI / ID Number: 10.3390/md19090510
Copyright Information:

Copyright 2021 The authors.Licensee MDPI, Basel, Switzerland.This article is an open access articledistributed under the terms andconditions of the Creative CommonsAttribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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