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Androgen levels and energy metabolism in Oreochromis mossambicus

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Two studies were conducted to test the relationship between androgens and routine metabolism in the Mozambique tilapia Oreochromis mossambicus. In the first study, endogenous levels of plasma levels of androgens and oxygen consumption rate were measured. In accordance with expectations routine metabolism corrected for metabolic body mass, was positively correlated with the behaviourally active metabolite of testosterone, 11‐ketotestosterone, but not with testosterone itself. In the second study levels of 11‐ketotestosterone were experimentally elevated, which increased the lowest values of (corrected) routine metabolism, indicating a positive relationship with standard metabolism. These results show the importance of measuring reproductive hormones, and are supportive of the hypothesis that elevated levels of androgens are a costly trait.
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Keywords: 11‐ketotestosterone; Oreochromis mossambicus; metabolic rate; testosterone; tilapia

Document Type: Regular Paper

Affiliations: 1: Unidade de Investigação em Eco- Etologia, Instituto Superior de Psicologia Aplicada, Rua Jardim do Tabaco 34, 1149-041 Lisboa, Portugal, 2: Department of Aquaculture Systems and Animal Nutrition, Institute for Animal Production in the Tropics and Subtropics (480), University of Hohenheim, Fruwirthstr. 12, D-70593, Stuttgart, Germany and 3: Centro de Ciências do Mar, Universidade do Algarve, Campus de Gambelas, 8000-117 Faro, Portugal

Publication date: 01 October 2004

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