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Functional diets improve survival and physiological response of Atlantic salmon (Salmo salar) to amoebic gill disease

Citation

Mullins, J and Nowak, B and Leef, M and Ron, O and Eriksen, TB and McGurk, C, Functional diets improve survival and physiological response of Atlantic salmon (Salmo salar) to amoebic gill disease, Journal of the World Aquaculture Society, 51, (3) pp. 634-648. ISSN 0893-8849 (2020) [Refereed Article]

Copyright Statement

Copyright 2020 World Aquaculture Society

DOI: doi:10.1111/jwas.12692

Abstract

Amoebic gill disease (AGD) is a major challenge for the marine salmonid farming industry. This disease is caused by Paramoeba perurans, which is a parasitic amoeba that affects fish growth and survival. The present work aimed at improving Atlantic salmon (Salmo salar) diet formulation as a preventive treatment for AGD. Four diets with different quantitative composition of functional ingredients, such as arginine, premixes, plant extracts, nucleotides, beta glucans, and vitamins C and E were tested. In the first trial, fish fed the different diets were exposed to a 74‐day challenge trial with P. perurans, and their survival, feed intake, and growth performance were analyzed together with plasma properties and gill histopathology. Additionally, a second trial was performed where mucus constituents of Atlantic salmon fed the same diets were analyzed from fish that were not exposed to AGD. Results suggest a positive effect of the functional ingredients on Atlantic salmon survival and immune response. Particularly, the inclusion of arginine, microadditives, and vitamins C and E improved survival, with arginine being an important driver of pathogen protection. The protective role of mucus also improved with these functional ingredients in nonchallenged fish, as suggested by its greater viscosity and by the increased levels of lysozymes and polysaccharides. Overall, the present work supports improving diet formulation as a promising approach for the preventive treatment of AGD.

Item Details

Item Type:Refereed Article
Keywords:amoebic gill disease, Atlantic salmon, challenge trial, mucus, Paramoeba perurans
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Fish pests and diseases
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - aquaculture
Objective Field:Aquaculture fin fish (excl. tuna)
UTAS Author:Nowak, B (Professor Barbara Nowak)
UTAS Author:Leef, M (Dr Melanie Leef)
ID Code:140960
Year Published:2020
Web of Science® Times Cited:1
Deposited By:Fisheries and Aquaculture
Deposited On:2020-09-16
Last Modified:2021-02-15
Downloads:0

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