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Mortality of Coho Smolts Migrating Through a Lake System
Author(s) -
Allen George H.
Publication year - 1968
Publication title -
ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.144
H-Index - 294
eISSN - 1939-9170
pISSN - 0012-9658
DOI - 10.2307/1936554
Subject(s) - oncorhynchus , fishery , sound (geography) , brood , fishing , fish <actinopterygii> , geography , environmental science , ecology , oceanography , biology , geology
To study mortality of smolts migrating through a lake and river system, single fin—marked fingerling coho salmon (Oncorhynchus kisutch) of the 1950 brood year were released in 1952 at two points within the Lake Washington drainage, Puget Sound, Washington. Coho smolts migrating through 56 km of lake and river system before entering Puget Sound suffered about 22% greater mortality than coho migrating only 8 km (5 miles). Factors possibly biasing the result were assessed for the experiment, especially the need for equal fishing and natural mortality on test lots of fish while in the ocean.