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Combined effects of elevated rearing temperature and dietary energy level on heart morphology and growth performance of Tasmanian Atlantic salmon (Salmo salar L.)

Foddai, M, Carter, CG ORCID: 0000-0001-5210-1282, Hilder, PE, Gurr, H and Ruff, N 2022 , 'Combined effects of elevated rearing temperature and dietary energy level on heart morphology and growth performance of Tasmanian Atlantic salmon (Salmo salar L.)' , Journal of Fish Diseases, vol. 45, no. 2 , pp. 301-313 , doi: 10.1111/jfd.13555.

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Abstract

Cardiac abnormalities may pose a threat to salmonid aquaculture due to their potential detrimental effect on fish health and welfare. The teleost heart is an extremely plastic organ with important morphological differences between wild and farmed fish that include ventricular shape, alignment of the bulbus arteriosus and epicardial fat deposition. However, little is known about how different factors and interactions among them may affect cardiac morphology of Atlantic salmon. To determine whether rearing temperature could induce cardiac malformations in large Tasmanian Atlantic salmon, we examined a range of cardiac morphology indicators and growth parameters in a population of 1–2 kg seawater salmon (n = 60 temperature−1 diet−1) exposed to control and elevated temperatures of 15 and 19°C, respectively, while fed one of two commercial feeds with different dietary energy levels. Most fish possessed conspicuous fat around the heart with a tendency towards a rounded ventricle and a more obtuse angle of the bulbus arteriosus. However, fish showed no significant differences in heart shape and bulbus alignment in relation to water temperature and dietary energy. These results suggest that cardiac morphology of large Atlantic salmon is unlikely to be affected by rearing temperature and dietary energy during the grow-out phase.

Item Type: Article
Authors/Creators:Foddai, M and Carter, CG and Hilder, PE and Gurr, H and Ruff, N
Keywords: aquaculture, nutrition, health, heart, Atlantic salmon, cardiac morphology, epicardial fat, heart ventricle, warmer temperature
Journal or Publication Title: Journal of Fish Diseases
Publisher: Blackwell Publishing Ltd
ISSN: 0140-7775
DOI / ID Number: 10.1111/jfd.13555
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© 2021 John Wiley & Sons Ltd

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