Abstract
Abstract This study was designed to quantify heart growth in trout with elevated plasma levels of testosterone or 17-α methyltestosterone. It arises from the observation that the heart of male trout doubles in mass in preparation for spawning and examines the relationship between plasma levels of male sex steroids and the observed heart growth. Using androgens implanted in vehicles of either cocoa butter or silicone rubber pellets, we have stimulated heart growth in immature male and female rainbow trout to achieve relative ventricle masses over 1.7 times those of controls within a 42-day period. Testosterone and 17-α methyltestosterone both induced growth of the heart relative to controls; 17-α methyltestosterone being about two times more potent in its anabolic effects on the heart.
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