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Promotion of growth in diploid and triploid coho salmon with parenteral delivery of a recombinant porcine somatotropin

Published online by Cambridge University Press:  15 July 1991

Ewen McLean*
Affiliation:
Department of Fisheries and Oceans, West Vancouver Laboratory, 4160 Marine Drive, West Vancouver, British Columbia, V7V 1N6, Canada
Marianne D. Sadar
Affiliation:
Department of Fisheries and Oceans, West Vancouver Laboratory, 4160 Marine Drive, West Vancouver, British Columbia, V7V 1N6, Canada
Robert H. Delvin
Affiliation:
Department of Fisheries and Oceans, West Vancouver Laboratory, 4160 Marine Drive, West Vancouver, British Columbia, V7V 1N6, Canada
Lawrence M. Souza
Affiliation:
Amgen Inc., 1900 Oak Terrace Lane, Thousand Oaks, CA, USA
Edward M. Donaldson
Affiliation:
Department of Fisheries and Oceans, West Vancouver Laboratory, 4160 Marine Drive, West Vancouver, British Columbia, V7V 1N6, Canada
*
*Correspondence
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Abstract

The growth response of diploid (2n) and thermally-induced triploid (3n) coho salmon to injected recombinant porcine somatotropin was examined over a 10 week period. All treatments were under-taken using replicate groups of 25 animals per group. Control 2n and 3n replicate groups grew at identical rates throughout the period of study, although 3n fish exhibited lower condition factors. Recombinant poreine somatotropin treated 2n and 3n fish responded positively to therapy and, by week 4 of the trial, expressed significantly greater increases in both weight and length (p < 0.01) when compared to controls. At the end of the study period, soinatotropin treated animals had gained approximately twice the amount of weight of controls. Food conversion efficiencies were greater in treated salmon, regardless of ploidy state. This relationship also extended to weight and length specific growth rates. The economic benefits of commercial application of recombinant porcine somatotropin therapy to triploid Pacific salmon culture are discussed.

Type
Research Article
Copyright
© IFREMER-Gauthier-Villars, 1991

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