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Spatial variability in condition of southern rock lobsters (Jasus edwardsii) at the start of the Tasmanian fishing season

Citation

Mendo, T and Simon, C and Green, B and Gardner, C, Spatial variability in condition of southern rock lobsters (Jasus edwardsii) at the start of the Tasmanian fishing season, PLoS One, 11, (11) Article e0166343. ISSN 1932-6203 (2016) [Refereed Article]


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Copyright Statement

Copyright 2016 Mendo et al. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1371/journal.pone.0166343

Abstract

The southern rock lobster (Jasus edwardsii) industry in Australia favours red lobsters, which are usually caught in shallow waters, over paler (brindle) lobsters. This preference is driven partly by the Chinese market, where red is associated with luck and prosperity, and additionally, by the widely held perception within the industry that brindles have greater mortality rates during out of water transport than reds. Limited scientific evidence supports these industry observations; however, these studies did not evaluate the initial condition of lobsters. This study aimed first, to determine which variables better describe condition in J. edwardsii and second, to compare condition among lobsters in several sites around Tasmania at the typical time of high transport mortality. Male lobsters were collected from the South West, South East, East and North coast of Tasmania in late November/December 2014, which correspond to the start of the Tasmanian fishing season. A comprehensive condition assessment was applied by measuring tissue proximal composition, Brix index, Total Haemocyte Count, pH, haemocyanin and another 16 haemolymph parameters of interest. A useful framework to compare condition in J. edwardsii was established by first, using Brix index as a measure of nutritional condition, second, using pH, magnesium, and bicarbonate to evaluate differences in physiological condition and finally, using THC counts as a proxy for lobster health condition. Lobsters from different sites had different nutritional, physiological and health condition, consistent with industry observations, however our results indicate that some red shallow water lobsters exhibited poorer nutritional and health condition, while some deep water brindle lobsters were in good condition. Differences in condition could not be directly associated to catch depth of lobsters and was related to other spatially discrete factors which sometimes vary over distances < '3 km.

Item Details

Item Type:Refereed Article
Keywords:condition, Jasus edwardsii, transport mortality
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquatic Ecosystem Studies and Stock Assessment
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Wild Caught
Objective Field:Wild Caught Rock Lobster
UTAS Author:Mendo, T (Dr Tania Mendo Aguilar)
UTAS Author:Green, B (Associate Professor Bridget Green)
UTAS Author:Gardner, C (Professor Caleb Gardner)
ID Code:112733
Year Published:2016
Web of Science® Times Cited:4
Deposited By:Fisheries and Aquaculture
Deposited On:2016-11-24
Last Modified:2018-03-20
Downloads:45 View Download Statistics

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