Colonization of a Watershed by Anadromous Salmonids following the Installation of a Fish Ladder in Margaret Creek, Southeast Alaska

摘要: Abstract We evaluated the colonization of a watershed blocked by 7-m falls following installation an Alaska steeppass fish ladder to provide access for anadromous salmonids. Coho salmon Oncorhynchus kisutch, pink O. gorbuscha, and chum keta were present below falls. Fry sockeye nerka stocked into Margaret Lake once in 1988 annually from 1990 through 1994. Pink most numerous species colonize habitat above moved up during all years. However, progeny 25,000 coho presmolts that 1991 greatest proportion returns 1992, 1995, 1996. During study, only 1,595 returned more than 1.4 million stocked. The rapidity naturally occurring salmonids, including cutthroat trout clarki, Dolly Varden Salvelinus malma, steelhead mykiss, underscores life history strategy exploiting newly accessible h...