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Do exotic salmonids feed on native fauna after escaping from aquaculture cages in Tasmania, Australia?

Citation

Abrantes, KG and Lyle, JM and Nicholas, PD and Semmens, JM, Do exotic salmonids feed on native fauna after escaping from aquaculture cages in Tasmania, Australia?, Canadian Journal of Fisheries and Aquatic Sciences, 68, (9) pp. 1539-1551. ISSN 0706-652X (2011) [Refereed Article]


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Copyright Statement

Copyright 2011 NRC Research Press

DOI: doi:10.1139/F2011-057

Abstract

Atlantic salmon, Salmo salar, and rainbow trout, Oncorhynchus mykiss, are farmed in Tasmania, Australia, where fish sometimes escape into the natural environment. If escapees are able to survive and feed on native fauna, it is likely that they will have ecosystem impacts. Stomach content, body condition (muscle lipid content and Fulton’ K), stable isotope, and fatty acid analysis were used to determine if escaped salmonids feed on native fauna. Results indicate that, in general, escaped salmonids do not feed on native fauna. Salmonids loose condition after escaping, and escapee stomachs were mostly empty or contained non-nutritious material or feed pellets. Nevertheless, almost a quarter of rainbow trout stomachs contained native fauna. The majority of escapees had biochemical composition similar to caged animals, indicating that these fish had not switched to feed on local food sources. However, a small fraction of escapees conclusively showed changes in biochemical parameters indicative of a shift to feeding on native fauna. Given the numbers and frequency of escapes, this can have an important impact on native species and on the ecology of Macquarie Harbour.

Item Details

Item Type:Refereed Article
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 Fin Fish (excl. Tuna)
Author:Abrantes, KG (Dr Katia Dos Santos Abrantes)
Author:Lyle, JM (Dr Jeremy Lyle)
Author:Semmens, JM (Associate Professor Jayson Semmens)
ID Code:75676
Year Published:2011
Web of Science® Times Cited:14
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2012-02-09
Last Modified:2012-08-02
Downloads:0

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