Quilcene National Fish Hatchery Coded Wire Tagging Results: Coho Brood Years 1974-81 and Fall Chinook Brood Years 1972-75

摘要

This report provides a comprehensive analysis of coded wire tag recovery data for eight broods of Quilcene-stock coho and four broods of fall chinook (various stock) produced a Quilcene National Fish Hatchery. Documentation of pertinent information on the experimental design and specific methods used during tagging of the various groups of fish is included. Total survival of coho yearlings released directly from Quilcene hatchery ranged from 5.87 to 10.49% There was a general decline in total sruvival over the five broods (1977-1981) studies. Survivals of Quilcene coho were comparable to those for similar programs at neraby hatcheries. Canadian fisheries caught about 30% of all Quilcene coho harvested and there was a gradual increase in that percentage over the 5 years studies. It may be possible to harvest a greater percentage of the returning coho run in area. 12A. The average size of adults in the fishery and adults returning to the hatchery declined over the same period. Adults returning to the hatchery were significantly smaller than those captured in the area 12A. Quilcene coho were produced at roughly a 2.7: benefit: cost ratio.