Assessing the Influence of Salmon Farming through Total Lipids, Fatty Acids, and Trace Elements in the Liver and Muscle of Wild Saithe Pollachius virens

Saithe Pollachius virens are attracted to uneaten salmon feed underneath cages at open-cage salmon farms in Norway. The aggregated Saithe have modified their feeding habits as they have switched from wild prey to uneaten food pellets, which could lead to physiological and biochemical changes in the...

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Bibliographic Details
Published in:Marine and coastal fisheries 2015, Vol.7 (1), p.59-67
Main Authors: Arechavala-Lopez, P, Sæther, B.-S, Marhuenda-Egea, F, Sanchez-Jerez, P, Uglem, I
Format: Article
Language:English
Subjects:
Aquaculture
Body condition
Cages
Commercial fishing
Diet
Farms
Fatty acids
Feeding
Feeds
Fish
Fish feeds
Fisheries
Freshwater fishes
Lipids
Liver
Marine
Mercury
Metabolism
Metabolites
Physiology
Pollachius virens
Prey
Profiles
Salmon
Salmonidae
Tissue
Trace elements
Zinc
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Summary:Saithe Pollachius virens are attracted to uneaten salmon feed underneath cages at open-cage salmon farms in Norway. The aggregated Saithe have modified their feeding habits as they have switched from wild prey to uneaten food pellets, which could lead to physiological and biochemical changes in the Saithe. Variations in profiles of total lipids, fatty acids, and trace elements in Saithe liver and muscle were measured to evaluate the influence of fish feed from salmon farms on wild Saithe populations. Farm-aggregated Saithe had higher fat content in liver tissues than did individuals captured more than 25 km away from farms, but no clear differences were found in muscle tissues. High proportions of fatty acids of terrestrial origin, such as oleic, linoleic, and linolenic acids, in liver and muscle tissues of farm-aggregated Saithe reflected the presence of wild Saithe at farms. Accordingly, low proportions of arachidonic, eicosapentaenoic, and docosahexaenoic acids in Saithe tissues mirrored the feeding activity at farms. Variations in specific trace element signatures among fish groups also revealed the farming influence on wild Saithe. High levels of Fe, As, Se, Zn, and B in liver, but also As, B, Li, Hg, and Sr in muscle of Saithe captured away from farms indicated the absence of feeding at farms.
ISSN:1942-5120
1942-5120
DOI:10.1080/19425120.2014.1001540