Stock assessment of Arctic grayling and rainbow trout in Piledriver Slough during 1992
By: by Douglas F. Fleming and George J. Schisler.
Contributors: Schisler, George J.; Alaska. Division of Sport Fish.
Series: Fishery data series -- no. 93-8.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish
Published: 1993
Place of publication: Anchorage, Alaska
Language: eng
Number of pages: 38
Subjects: Arctic grayling -- Alaska -- Piledriver Slough -- Statistics.; Rainbow trout -- Alaska -- Piledriver Slough -- Statistics.; Fish populations -- Alaska -- Piledriver Slough -- Statistics.; Fish-culture -- Alaska -- Piledriver Slough.
Genres: Statistics.
Description: A detailed assessment of the Arctic grayling Thymallus arcticus population was conducted at Piledriver Slough, near Fairbanks, Alaska during 1992. A mark-recapture experiment was conducted, from which abundance, age and size composition of the Arctic grayling population were estimated. The timing of the investigation corresponded with spring break-up and the onset of a popular spring fishery, similar to past investigations. Fish were captured using pulsed direct current backpack electrofishing gear. An estimated 14,030 (SE = 1,860) Arctic grayling greater than 149 millimeter fork length were present during the May spawning period. The stock was characterized by a high proportion of sub-legal sized Arctic grayling (less than 260 millimeter fork length) and ages 4 and 5 predominated. Preliminary estimates of survival and exploitation indicated the stock of Arctic grayling may have a low survival rate and higher than expected exploitation rates. The results of a concurrent mark-recapture experiment on stocked rainbow trout Oncorhynchus mykiss indicated an overwinter survival of 0.25 percent for the 1991 stocking cohort.
Notes: "March 1993".

Includes bibliographical references (p. 25-28).

Also issued online.