|Title:||Contribution of Columbia River hatcheries to harvest of 1964 brood fall Chinook salmon (Oncorhynchus tshawytscha)|
|Author/Editor:||Roy J. Wahle, Arthur H. Arp, Steven K. Olhausen|
|Institution:||National Marine Fisheries Service Economic Feasibility Report No. 2|
A marking experiment was designed in which fall chinook salmon (Oncorhynchus tshawytscha) from 12 Columbia River hatcheries were marked in 4 consecutive years to estimate their contribution to the sport and commercial fisheries. The study was planned and executed by scientists of the Fisheries Research Board of Canada, U. S. Bureau of Sport Fisheries and Wildlife, National Marine Fisheries Service, and fishery agencies of the States of Alaska, Washington, Oregon and California.
Sampling for marked chinook salmon was conducted in most ocean fisheries from Avila Beach, California to Pelican, Alaska, as well as on the Columbia River. This report delineates and summarizes the estimated contribution of the total hatchery releases of the 1964 brood based on the returns for the 4.6 million marked fish released in the fourth year of the study. Estimates of the contributions of the 1961, 1962 and 1963 broods were published in 1969 and 1970.
The estimated catch of the 1964-brood fish that originated from the hatcheries under study was 262,643, or about 10.9 percent of the total catch of chinook salmon of that brood in the fisheries sampled. The estimated net value of this catch was $1,862,750 in comparison with production costs of $837,750. The benefit-to-cost ratio was 2.2:1.
The net value of the catch of fall chinook salmon of the 1964 brood that originated from all Columbia River hatcheries (including those not participating in the marking experiment) was estimated at $2,103,963.
|Notes:||Modified file downloaded from Streamnet Library at http://docs.streamnetlibrary.org/USFWS/CRL-EconFeasRept-2.pdf|