Coastal Cutthroat Trout: A Life History Compendium

Abstract
The coastal cutthroat trout Oncorhynchus clarki clarki occurs along the Pacific coast of North America from Humboldt Bay, California, to Prince William Sound, Alaska, in a zone that closely overlaps the coastal rain forest belt. This species exhibits anadromous, potamodromous stream-dwelling, potamodromous lake-dwelling, and headwater stream-resident life history forms. Anadromous fish spawn in small tributaries from late winter through spring, depending on the locality. Juveniles remain in streams for two or more years and congregate during their early months in habitats along stream edges. Later, they move to pools unless coho salmon O. kisutch are present, in which case they are driven to riffles. Most anadromous cutthroat trout juveniles smolt at age 2 if they migrate to sheltered saltwater areas or age 3 or 4 if they migrate to the open ocean. Seaward migration peaks in May, and the fish remain close inshore while in salt water. The fish seldom overwinter at sea but return to rivers in the f...

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