Thermal tolerance varies in tropical and sub-tropical populations of barramundi (Lates calcarifer) consistent with local adaptation

Newton, James R., Smith-Keune, Carolyn, and Jerry, Dean R. (2010) Thermal tolerance varies in tropical and sub-tropical populations of barramundi (Lates calcarifer) consistent with local adaptation. Aquaculture, 308 (Supplement 1). S128-S132.

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Abstract

Barramundi (Lates calcarifer) are cultured throughout Australasia and increasingly throughout the northern hemisphere. In Australia, barramundi are found in rivers and estuaries across 16 degrees of latitude (10°S–26°S) exposing fish from northern and southern parts of their distribution to different thermal environments. Australian barramundi show strong genetic structuring and this coupled with exposure to varying thermal environments may have led to thermal tolerance differences among populations of interest to aquaculture. To determine if barramundi are thermally adapted to their local environment we used loss of swimming equilibrium (LOSE) as a predictor of upper thermal tolerance in fish from a tropical (Darwin, Northern Territory) and subtropical (Gladstone, Queensland) population and showed that significant differences exist between these two genetically divergent stocks. The tropical population had significantly higher tolerance to warm water temperatures than sub-tropical fish exhibiting a significantly longer time until loss of swimming equilibrium (LOSE) at 40 °C (ANOVA; F1, 22 = 7.86, P ≤ 0.01). As LOSE challenge tests are not practical to the identification of commercial broodstock animals we also evaluated dissociated caudal fin cells as a sensitive and non-invasive method to determine upper thermal tolerance in this species. Results from dissociated fin cells strongly correlated with those based on LOSE confirming that this method can be used to discriminate populations with different thermal tolerances without having to directly thermally challenge broodstock animals.

Item ID: 16654
Item Type: Article (Research - C1)
ISSN: 1873-5622
Keywords: Lates calcarifer, upper thermal tolerance, temperature, dissociated caudal fin cells, aquaculture, local adaptation
Date Deposited: 05 May 2011 08:56
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070401 Aquaculture @ 50%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070405 Fish Physiology and Genetics @ 50%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8301 Fisheries - Aquaculture > 830102 Aquaculture Fin Fish (excl. Tuna) @ 100%
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