Correlation of plasma IGF-I concentrations and growth rate in aquacultured finfish: a tool for assessing the potential of new diets

A recently developed radioimmunoassay (RIA) for measuring insulin-like growth factor (IGF-I) in a variety of fish species was used to investigate the correlation between growth rate and circulating IGF-I concentrations of barramundi ( Lates calcarifer), Atlantic salmon ( Salmo salar) and Southern Bl...

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Bibliographic Details
Published in:Aquaculture 2004-06, Vol.236 (1), p.583-592
Main Authors: Dyer, Anthony R, Barlow, Christopher G, Bransden, Matthew P, Carter, Chris G, Glencross, Brett D, Richardson, Neil, Thomas, Philip M, Williams, Kevin C, Carragher, John F
Format: Article
Language:English
Subjects:
Animal aquaculture
animal growth
Animal productions
Biological and medical sciences
blood plasma
body weight
feed composition
feeds
Fish
fish culture
fish feeding
Fundamental and applied biological sciences. Psychology
General aspects
Growth
IGF-I
insulin-like growth factor I
Lates calcarifer
Nutrition
Salmo salar
salmon
Thunnus
Thunnus maccoyii
tuna
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Summary:A recently developed radioimmunoassay (RIA) for measuring insulin-like growth factor (IGF-I) in a variety of fish species was used to investigate the correlation between growth rate and circulating IGF-I concentrations of barramundi ( Lates calcarifer), Atlantic salmon ( Salmo salar) and Southern Bluefin tuna ( Thunnus maccoyii). Plasma IGF-I concentration significantly increased with increasing ration size in barramundi and IGF-I concentration was positively correlated to growth rates obtained in Atlantic salmon ( r 2=0.67) and barramundi ( r 2=0.65) when fed a variety of diet formulations. IGF-I was also positively correlated to protein concentration ( r 2=0.59). This evidence suggested that measuring IGF-I concentration may provide a useful tool for monitoring fish growth rate and also as a method to rapidly assess different aquaculture diets. However, no such correlation was demonstrated in the tuna study probably due to seasonal cooling of sea surface temperature shortly before blood was sampled. Thus, some recommendations for the design and sampling strategy of nutritional trials where IGF-I concentrations are measured are discussed.
ISSN:0044-8486
1873-5622
DOI:10.1016/j.aquaculture.2003.12.025