Survey of the dolly varden and rainbow trout populations in the Iliamna River, 1996 and 1997
By: by Michael J. Jaenicke.
Contributors: Alaska. Division of Sport Fish.
Series: Fishery data series -- no. 99-25.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish, Research and Technical Services
Published: 1999
Place of publication: Anchorage
Language: eng
Number of pages: 28
Subjects: Rainbow trout -- Alaska -- Iliamna River -- Statistics.; Dolly varden (trout) -- Alaska -- Iliamna River -- Statistics.; Trout fisheries -- Alaska -- Iliamna River -- Statistics.; Dolly varden fisheries -- Alaska -- Iliamna River -- Statistics.; Fish populations -- Alaska -- Iliamna River -- Measurement.
Genres: Statistics.
Description: Baseline biological data for Dolly Varden and rainbow trout in the Iliamna River were collected during mid-July though late August of 1996 and 1997. The most effective sampling gear was hook and line. Hoop nets were only marginally successful and beach seining did not work effectively in the generally shallow, rapid water of the Iliamna River. More Dolly Varden were captured and sampled in 1997 (n = 361) than in 1996 (n = 126). The mean length and weight of Dolly Varden sampled in 1996 was 477 mm (SE = 7) and 1,458 g (SE = 64), respectively; in 1997, mean length was 532 mm (SE = 30) and mean weight was 1,828 g (SE = 30). The mean length and weight of rainbow trout sampled in 1996 was 439 mm (SE = 12) and 1,128 g (SE = 92), respectively, with a modal age of 7 years. The mean length and weight of rainbow trout sampled in 1997 was 478 mm (SE = 9) and 1,543 g (SE = 84), respectively, and the modal ages were 5 and 6 years old. Visual surveys provided an index of abundance of Dolly Varden in the navigable section of the Iliamna River: 380 Dolly Varden in 1996 and 272 Dolly Varden in 1997. These indices obviously underestimated the total abundance. A survey conducted in April 1997 of residents of the Pedro Bay community indicated that no subsistence harvest of Dolly Varden in the Iliamna River occurred during 1April 1996 to 31 March 1997.
Notes: "October 1999."

Includes bibliographical references (p. 21-22).

Also issued online.