Induction of precocious maturation in masculinized Atlantic salmon by treatment with sustained-release LHRHa and testosterone |
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| Authors: | J.C. Henry E. McLean I. Mayer E.M. Donaldson |
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| Affiliation: | (1) Biotechnology Laboratory, Aquaculture Division, Sohngårdsholmsvej, Aalborg University, Aalborg, Denmark;(2) Department of Zoology, University of Stockholm, Stockholm, Sweden;(3) West Vancouver Laboratory West, Fisheries & Oceans, Vancouver, Canada |
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| Abstract: | The effect of treating immature, masculinized, Atlantic salmon, Salmo salar, with testosterone or [Des-Gly10] D-Ala6-LHRH ethylamide (LHRHa), either alone or in combination, over an 81 day period was evaluated as a method for accelerating maturation. Two sustained-release LHRHa implants were compared: ethylene vinyl acetate copolymer (EVAC) and silicone elastomer. Animals primed with testosterone did not express advanced spermatogenesis when compared against control salmon (p > 0.05). However, fish primed with testosterone, followed by sham, LHRHa EVAC, or LHRHa silicone elastomer implants expressed increased (p < 0.05) gonadosomatic index (GSI) when compared with values derived from day 0 of the study. Neither spermatogenesis nor GSI were affected when salmon were treated with LHRHa alone, irrespective of the vehicle employed. In contrast, spermatogenesis was significantly (p < 0.05) advanced in testosterone-treated fish, which were administered LHRHa by EVAC, when compared with groups that received individual treatment only. © Rapid Science Ltd. 1998 |
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| Keywords: | Atlantic salmon (Salmo salar) LHRH Masculinization Monosex production Testosterone |
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