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

Citation

Turnbull, A and Dorantes-Aranda, JJ and Madigan, T and Jolley, J and Revill, H and Harwood, T and Hallegraeff, G, Field validation of the southern rock lobster paralytic shellfish toxin monitoring program in Tasmania, Australia, Marine Drugs, 19, (9) Article 510. ISSN 1660-3397 (2021) [Refereed Article]


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Copyright Statement

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

DOI: doi:10.3390/md19090510

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 <0.22 mg STX equiv. kg−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 Details

Item Type:Refereed Article
Keywords:marine biotoxin, non-traditional vector, Jasus edwardsii, lobster, uptake, depuration, risk management
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Phycology (incl. marine grasses)
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - aquaculture
Objective Field:Aquaculture rock lobster
UTAS Author:Turnbull, A (Dr Alison Turnbull)
UTAS Author:Dorantes-Aranda, JJ (Dr Juan Dorantes Aranda)
UTAS Author:Hallegraeff, G (Professor Gustaaf Hallegraeff)
ID Code:146482
Year Published:2021
Deposited By:Directorate
Deposited On:2021-09-09
Last Modified:2021-11-29
Downloads:16 View Download Statistics

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