Assessment of dolly varden overwintering in selected streams of the Seward Peninsula, Alaska, during 1992
By: by Alfred L. DeCicco.
Contributors: Alaska. Division of Sport Fish.
Series: Fishery data series -- no. 93-20.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish
Published: 1993
Place of publication: Anchorage, Alaska
Language: eng
Number of pages: 42
Subjects: Dolly Varden (Trout) -- Alaska -- Seward Peninsula.; Fish populations -- Alaska -- Seward Peninsula.
Description: The estimated abundance of Dolly Varden Salvelinus malma >340 millimeters fork length overwintering in a 24 kilometer section of the Nome River in the fall of 1992 was 3,712 fish (SE = 381). Dolly Varden ranged in fork length from 279 to 610 millimeters. Dolly Varden did not emigrate from the Nome River between the two sampling events in the fall of 1991. Based on a three event Jolly-Seber model, the estimate of survival between the 1991 sampling events was 1.35 and based on a five event Jolly-Seber model, the survival between 1991 sampling events was 0.964. Since the two 1991 sampling events took place within three weeks, there was little chance for mortality, therefore, 1-survival = emigration. Jolly-Seber estimates of abundance just before the second sampling event in 1991 were 4,905 fish (SE = 226) for the three event model, and 2,448 fish (SE = 400) for the five event model. Most Dolly Varden recaptured in 1992 were from the river in which they had been tagged. Movements of 5% or greater of fish tagged in one river to any single other river were not detected, but, when tag recoveries from all sources were examined, movements to all waters other than where fish were tagged were a minimum of about 20% after one year. Most (69%) Dolly Varden in the Nome River were in the "quality" Relative Stock Density category. "Memorable" fish comprised only 2% of the population and no fish in the "trophy" category were sampled. Fish between 351 and 400 millimeters fork length comprised 64% of the population >344 millimeters fork length in the Nome River in 1992.
Notes: "August 1993."

"Partially financed by the Federal Aid in Sport Fish Restoration Act ... under project F-10-8, job no. R-3-3(c)."

Includes bibliographical references (p. 25-28).

Also issued online.