Abstract
Abstract Cutthroat trout (Salmo clarki) x rainbow trout (Salmo gairdneri) hybrids were introduced in Henry's Lake, Idaho, to produce a trophy fishery. The performance of two strains of F1 hybrids (cutthroat trout x rainbow trout and cutthroat trout x steelhead [anadromous S. gairdneri]) was monitored. Growth rates of both strains were comparable, but cutthroat trout x rainbow trout hybrids were caught in greater numbers than the other hybrid during the third and fourth years of life. Hybrid trout are considered to be an excellent sport fish with value as a trophy species. However, hybrid trout are fertile and potentially could spawn with native cutthroat trout in this lake. Initial heat-shock experiments showed that several time-temperature regimes effectively induced triploidy in F1 hybrids. Stocking sterile triploid hybrids would maintain the genetic integrity of the indigenous cutthroat trout.
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