We hypothesize that exercise enhances growth of hatchery-reared white seabass by reducing stress and modulating key growth-regulatory factors, and that this will be associated with positive effects on swimming performance. It is secondarily hypothesized that positive effects of exercise on growth and swimming performance will be applicable to other marine finfish, including California yellowtail and California sheephead.
It sounds crazy, exercising fish to make them gain weight. But that is exactly what happens with juvenile California yellowtail, a once common species off California and Mexico fished heavily by the Japanese. Not surprisingly, given parallels with human health, ex- ercise also alleviates stress in fish, as measured by bloodstream levels of cortisol, the same stress hormone in humans. The findings have led a California Department of Fish and Game biologist to consider rearing juvenile endangered salmon in raceways, in the hopes of boosting their post-release survival.
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