Table 1. — Indices of brood year abundance of pink salmon based on net gear catch (in thousands of fish) and CPUE (in fish per standardized 



unit of effort). 



Brood 

 year 



Washington 



run 



Canadian non-Fraser run 

 Catch CPUE 



Early Fraser 

 Catch 



run 

 CPUE 



Late Fraser 



run 



l. atch 



CPUE 



Catch 



CPUE 



1953 



1,575.0 



49.7 



474.2 



13.6 



3,626.9 



53.5 



2,553.3 



50.1 



1955 



804.7 



21.1 



272.0 



6.8 



5,185.6 



48.6 



3,445.6 



39.3 



1957 



543.3 



21.4 



211.6 



9.3 



3,826.4 



44.1 



888.9 



20.9 



1959 



320.4 



16.4 



169.3 



7.0 



2,611.3 



42.5 



1,221.0 



21.8 



1961 



420.1 



18.5 



295.2 



7.4 



308.3 



18.3 



56.3 



3.3 



1963 



3,983.6 



79.8 



793.0 



22.0 



3,097.1 



69.1 



1,442.5 



34.0 



1965 



260.9 



13.1 



101.6 



6.3 



497.5 



20.2 



263.2 



10.0 



1967 



199.2 



6.3 



179.5 



6.9 



4,520.8 



62.7 



1,887.1 



34.4 



1969 



54.3 



3.6 



69.8 



2.6 



721.1 



36.4 



706.9 



20.1 



1971 



207.2 



11.6 



69.3 



3.0 



1,829.8 



23.5 



2,045.5 



40.6 



1973 



257.2 



11.2 



108.9 



4.2 



2,403.7 



39.4 



1,123.6 



22.0 



numbers of pink salmon out-migrants, then there may be a 

 negative relationship between ocean catches of pink salmon in 

 year / and hatchery releases of coho salmon of brood year group 

 /'- 3. This possibility was evaluated by calculating regressions of 

 1) commercial ocean troll catch, 2) troll CPUE, and 3) sport 

 catch of pink salmon in year i against weight of coho salmon 

 yearlings of brood year group ;-3 released from Puget Sound 

 hatcheries. Hatchery releases are listed in Wahle et al. (1975). 



Surface sea temperature. — Regressions of 1) commercial 

 ocean troll catch, 2) troll CPUE, and 3) annual total ocean and 

 inside Washington sport catch against mean surface sea 

 temperatures for stations and periods indicated below were 

 calculated. Locations of shore stations were described by 

 Hollister (1960). 



1971 



4.98 



4.24 



4.73 



9.05 



1973 



5.31 



— 



5.70 



9.94 



1975 



5.42 



5.12 



4.87 



— 



Station 



Departure Bay 

 Amphitrite Point 

 Kains Island 

 Cape St. James 

 Langara Island 

 Ocean Station P 

 Langara Island 

 Cape St. James 

 Kains Island 

 Washington coast 



Time period 



April- August, year i— 1 

 August -October, year ;' - 1 

 September-October, year ;'- 1 

 September-October, year i— 1 

 October-November, year ;' - 1 

 February- April, year /' 

 May, year / 

 May-June, year i 

 June- July, year i 

 May, year ;' 



Data were obtained from sources listed earlier in this section. 

 Data for ocean Station P and the Washington coast were 

 compiled from numerous sources and are reproduced below. 



The assumption must be made that conditions monitored at 

 these sites are reflective of those in areas inhabited by the fish. 

 Dodimead et al. (1963) considered conditions at Station P repre- 

 sentative of those closer to the coast. Oceanographic conditions 

 at Langara Island and Cape St. James reflect those in exposed 

 ocean regions; those at Kains Island and Amphitrite Point 

 reflect the conditions in exposed coastal areas (Hollister 1956). 

 Surface temperatures in Departure Bay probably typify those in 

 sheltered inland waters. Robinson (1957) compared surface sea 

 temperatures at Amphitrite Point, a station at lat. 49 °N long. 

 148 °W, and in the coastal region bounded by lat. 48°-49°N 

 long. 129°-130°W. She concluded that shore station data were 

 indicative of conditions in coastal waters. 



Individual size. — We calculated regressions of 1) commercial 

 ocean troll catch, 2) troll CPUE, and 3) sport catch against the 

 average individual weight of pink salmon caught in terminal 

 area net fisheries in year i—2. Data for Canadian area 20 were 

 included because fish from all major stocks are included in the 

 catches there. Average weight was estimated as the aggregate 

 weight of the catch divided by the estimated number of fish 

 caught. For each area, regressions of troll catch and CPUE in 

 each month on the individual weight of fish caught during that 

 month were calculated. Weight data are listed in Table 2 and 

 were derived from catch statistics in sources listed previously in 

 this section. 



Chinook Salmon 











Washington 





Station P (°C) 





coast (°C) 



Year 



February 



March 



April 



May 



1955 



— 











8.80 



1957 



5.57 



5.94 



6.31 



10.20 



1959 



5.28 



5.03 



5.71 



10.20 



1961 



4.94 



4.78 



5.17 



10.98 



1963 



6.14 



6.00 



5.86 



12.39 



1965 



4.65 



— 



5.78 



— 



1967 



5.27 



— 



5.37 



13.42 



1969 



— 



— 



— 



— 



Indices of brood year abundance. — Indices consisted of 

 escapement estimates, net gear catch, and net gear CPUE during 

 peak run periods. Indices based on catch and CPUE are listed in 

 Table 3. Year i— 4 was considered the brood year except for 

 Columbia River fall Chinook salmon, for which data for years 

 /' — 3 and / — 4 were combined. Periods for major runs were as 

 follows: 



Run 



Spring chinook salmon 

 Columbia River 

 Puget Sound 



Inclusive Dates 



1 March-31 May 

 1 March-30 June 



