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Measuring condition of lobsters (Jasus edwardsii) to improve management of harvesting around periods of high transport mortality

Citation

Mendo, T and Simon, C and Green, B and Gardner, C, Measuring condition of lobsters (Jasus edwardsii) to improve management of harvesting around periods of high transport mortality, The Crustacean Society and International Association of Astacology 2015 Mid-Year Meeting, 19-23 July 2015, Sydney, Australia (2015) [Conference Extract]

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Abstract

Losses of up to 10% of lobsters during live transport have been observed in Tasmania around the time of season openings in mid-November. The fishing industry, including processors and operators are seeking ways to avoid this mortality. There is a general industry perception that brindle lobsters are associated with greater mortality rates. The main objective of this study was to quantify differences in condition of pale and red male lobster stocks in four different fishing areas of Tasmania that could be associated with different levels of mortality. Condition can be divided into several categories including nutritional condition, physiological condition, and health. All three categories can contribute to differences in vulnerability to transport stress therefore a holistic approach incorporating assessment of tissue composition, organic and inorganic constituents in the haemolymph and total haemocyte count was used. Nutritional condition (Brix index, hepatopancreas lipid content, abdominal muscle C:N ratio and dry matter content) and physiological condition (haemolymph urea, magnesium, potassium and bicarbonate content) were not affected by lobster colour but significantly differed among sites inside study areas. Indicators of health showed no significant differences between lobster colours or among sites. These results indicated that the overall condition of lobsters was not significantly different between red and pale lobsters. Variation in condition is greatest at a site level (fishing shot) strongly suggesting that specific biotic and abiotic conditions (i.e. depth, density of conspecifics, predator risk, competition) rather than broad scale latitudinal or regional patterns are driving condition of lobsters.

Item Details

Item Type:Conference Extract
Keywords:condition, rock lobster, Jasus edwardsii, transport
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Fisheries Management
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Wild Caught
Objective Field:Wild Caught Rock Lobster
Author:Mendo, T (Dr Tania Mendo Aguilar)
Author:Simon, C (Dr Cedric Simon)
Author:Green, B (Associate Professor Bridget Green)
Author:Gardner, C (Professor Caleb Gardner)
ID Code:100125
Year Published:2015
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2015-05-04
Last Modified:2015-05-05
Downloads:0

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