FISHERY BULLETIN: VOL. 72. NO. I 



Table 3. — Areas where catches were examined for marked coho salmon of Columbia River origin by port or zone of landing and 



type of fishery. 



Type of fishery- 



Area sampled 



Sport 



Commercial 



Rod and reel 



Troll 



Gill net 



Dip net 



Purse seine 



British Columbia Alaska area. Zones 29, 40-'t3, Zones 29, UO-i+3 Zones U0-U3. 



and Area C.i/ 

 Washington ocean Sekiu Seattle Grays Harbor. 



Heah Bay Neah Bay Willapa Bay. 



LaPush LaPush . 



Westport Westport . 



Ilwaco Ilwaco. 



Puget Sound and 



Juan de Fuca Strait Zones 6-12 Zones 1-15 Zones 1-12. 



Oregon ocean Warrenton Astoria. 



Tillamook Tillamook. 



Pacific City Pacific City. 



Depoe Bay Depoe Bay. 



Newport Newport . 



Florence Florence . 



Winchester Bay.... Winchester Bay. 



Coos Bay Coos Bay. 



Gold Beach Bandon. 



Brookings Port Orford. 



Gold Beach. 

 Brookings . 



California ocean Crescent City Crescent City. 



 Trinidad Trinidad. 



Eureka Eureka . 



Shelter Cove. ..... Fort Bragg. 



Fort Bragg Albion. 



Albion Point Arena. 



Bodega Bay Bodega Bay. 



San Francisco Point Reyes. 



Half Moon Bay San Francisco. 



Santa Cruz Half Moon Bay. 



Monterey Moss Landing. 



Morro Bay Monterey. 



Avlla Morro Bay. 



Avlla. 

 Columbia River 

 and tributaries Zones 1-6 Zones 1-7 Klickitat River. 



Cowlitz River. 



Kalama River. 



Lewis River. 



Toutle River. 

 Washougal River. 



1/ Canadian catch 3-12 miles off Washington, Oregon, and California. 



river section of origin, and fishery. All marks 

 from the Uppermost River section (Leaven- 

 worth Hatcheiy in Appendix Table 4) are com- 

 bined as D-Ad marks in Table 5b. During the 

 3 years of sampling, 37,632 marked coho salm- 

 on were recovered. More marked 1965- than 

 1966-brood coho were caught, but more were 

 released from the 1965 brood. Carson National 

 F^ish Hatchery and OxBow Salmon Hatchery, 

 while participating in the study for the 1965 

 brood, did not do so for the 1966 brood (Table 

 2). The fraction of marked releases actually 

 recovered for the 1965 brood. 0.0089, was 

 slightly less than for the 1966 brood. 0.0093 

 (Tables 2, 5a, and 5b). 



146 



Estimated Recoveries 



As explained under "Estimating Procedures," 

 the total catch offish with a particular mark was 

 estimated for each stratum (fishery, port of land- 

 ing or area of capture, and time period) from 

 actual mark recoveries and the sampling frac- 

 tion. It was assumed that a random sample of 

 coho salmon was examined in each stratum and , 

 that in each sample all the marked fish were in- 

 spected. The total catch for each mark in each 

 fishery was estimated by summing over the 

 time periods and appropriate ports of landing 

 or areas of capture. 



The estimated catches and hatchery returns 



