Production of coho salmon from Slippery Creek, 1997-1998
By: by Dean Beers.
Contributors: Alaska. Division of Sport Fish.
Series: Fishery data series -- no. 99-46.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish, Policy and Technical Services Section
Published: 1999
Place of publication: Anchorage
Language: eng
Number of pages: 24
Subjects: Coho salmon -- Alaska -- Slippery Creek -- Statistics.; Fish populations -- Alaska -- Slippery Creek -- Measurement.; Fish stock assessment -- Alaska -- Slippery Creek.
Genres: Statistics.
Description: Recovery of coded wire tags from adults in 1998 tagged as smolts in 1997 was used to estimate smolt abundance, harvest, exploitation rate, and production of coho salmon Oncorhynchus kisutch from Slippery Creek, on Kuiu Island in Southeast Alaska. From 21 April through 11 June 1997, a smolt trap was operated below the outlet to Slippery Lake. During this period 33,077 coho salmon smolt 70 mm fork length were tagged and released alive with valid tags with tag codes 04-31-20, 04-48-13, 04-43-34 and 04-49-38. In 1998, 615 adult coho salmon bearing coded wire tags of Slippery Creek origin were recovered in random sampling of marine fisheries, and correspond to an estimated harvest of 2,932 (SE=114) fish in marine waters. Of this harvest, the troll fishery took an estimated 74.9%, net fisheries took 23.0%, and recreational fisheries 2.1%. The escapement of adults past the fish pass weir in 1998 was 632. Estimated run (escapement plus harvest) in 1998 for coho salmon originating from Slippery Creek is 3,564 (SE = 114); marine exploitation rate on this run is an estimated 82.3% (95% CI relative precision10.3%). Estimated smolt abundance in 1997 from Slippery Creek was 43,544 (SE = 980), obtained by using a modified Petersen estimator, and marine survival rate of coho salmon smolt from Slippery Creek is an estimated 8.2 (95% CI relative precision 7.9 %).
Notes: "December 1999."

Includes bibliographical references (p. 12).

Also issued online.