Graduate Thesis Or Dissertation
 

Growth and survival of juvenile hatchery and wild steelhead trout, Salmo gairdneri, in streams

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  • Relative growth and survival of offspring from matings of hatchery and wild Deschutes River (Oregon) summer steelhead trout, Salmo gairdneri, were monitored to determine if hatchery fish differ genetically from wild fish in traits which can affect the stock-recruitment relationship of wild populations. Four natural streams and a hatchery pond were each stocked with genetically marked eyed-eggs or unfed fry from each of three matings: hatchery x hatchery (HH), hatchery x wild (HW) and wild x wild (WW). In the hatchery pond, HH fish exhibited the greatest survival and were larger than fish in the other groups. WW fish had the greatest survival and HW fish were largest in streams where there were significant differences in survival or length. The hatchery fish were genetically different from wild fish and can have an adverse effect on the stock-recruitment relationship of the wild population when they interbreed with wild fish. Hatchery procedures can be modified to lessen this effect by minimizing the genetic differences between hatchery and wild fish.
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