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Effects of aquaculture related stressors and nutritional restriction on circulating growth factors (GH, IGF-I and IGF-11) in Atlantic salmon and rainbow trout

Citation

Wilkinson, RJ and Porter, MJR and Woolcott, H and Longland, RM and Carragher, JF, Effects of aquaculture related stressors and nutritional restriction on circulating growth factors (GH, IGF-I and IGF-11) in Atlantic salmon and rainbow trout, Comparative Biochemistry and Physiology. Part A: Molecular & Integrative Physiology, 145, (2) pp. 214-224. ISSN 1095-6433 (2006) [Refereed Article]

DOI: doi:10.1016/j.cbpa.2006.06.010

Abstract

The effects of aquaculture related stressors on circulating levels of GH, IGF-I and for the first time, IGF-II in Atlantic salmon (Salmo salar) and rainbow trout (Oncorhynchus mykiss) were investigated. Specifically, circulating growth factor levels were measured in four different experiments. Two 24 h confinement stressor procedures, (one with Atlantic salmon, the other with rainbow trout); following a hypo-osmotic stressor (freshwater bath) in salt water acclimated, adult, Atlantic salmon; and during a 22 day starvation and re-feeding protocol with juvenile Atlantic salmon. Handling and confinement resulted in significant decreases in circulating levels of all three growth factors in Atlantic salmon, and IGF-I and IGF-II (but not GH) in rainbow trout. A 2-3 h freshwater bath to remove gill parasites on a commercial Atlantic salmon aquaculture operation caused a significant decrease in circulating GH and IGF-I concentrations, but no significant change in IGF-II concentration, 2 days post bathing. Starvation for a period of 15 days in Atlantic salmon resulted in a significant increase in circulating GH levels and a significant decrease in circulating IGF-I and IGF-II. Re-feeding of starved fish for 7 days resulted in a significant decrease in GH to the concentration measured in continually fed fish, however re-feeding did not change plasma levels of IGF-I and IGF-II relative to continually starved fish. The results presented here confirm previously observed handling and confinement stressor induced effects on GH and IGF-I and, for the first time, on IGF-II in salmonids. Furthermore this study confirms the nutritional regulation of GH, IGF-I and IGF-II in juvenile Atlantic salmon.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Fisheries - Aquaculture not elsewhere classified
Author:Wilkinson, RJ (Dr Ryan Wilkinson)
Author:Porter, MJR (Dr Mark Porter)
Author:Woolcott, H (Ms Hannah Woolcott)
Author:Longland, RM (Mr Ryan Longland)
ID Code:42112
Year Published:2006
Web of Science® Times Cited:55
Deposited By:TAFI - Aquaculture
Deposited On:2006-08-01
Last Modified:2010-06-03
Downloads:0

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