wild fish

Steelhead releasedIt takes just one generation for the DNA of steelhead domesticated in hatcheries to be altered and to be significantly different than steelhead whose parents are wild, according to a recent study by Oregon State University.
In fact the study found that in just one generation there were 723 genes that differed between the offspring of wild steelhead and the offspring of first-generation hatchery steelhead.
Further, the study found through gene enrichment analysis that adapting to the hatchery environment involves responses by the steelhead in wound healing, immunity and metabolism, suggesting the adaptation is due to crowding in hatcheries.
“We found hundreds of genes were   expressed   differently   between the offspring of first-generation hatchery fish and the offspring of wild fish, and that the difference was heritable from their parents,” said lead researcher Michael Blouin, professor in the Department of Integrative Biology at OSU.

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