California Department of Fish and Wildlife

Summer Steelhead Trout (native)

Oncorhynchus mykiss irideus

Summer steelhead have a unique life history pattern, in contrast to other steelhead. Adult summer steelhead enter their natal rivers in the spring or summer, and hold there until winter or spring when they spawn. The majority of adult steelhead enter the river in the fall or winter and spawn in early winter or spring. Along with their vulnerability to poaching, the history of water diversions and other habitat alterations have taken a toll on the runs of summer steelhead. These altered conditions have reduced many runs to critically low numbers and some runs have been eliminated. Steps are being taken to protect these special runs by the Department and other federal and state agencies including protection under the Endangered Species Act.

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