American coastline by the Mitkof . No salmon 

 were caught at three stations off Cape Bianco, 

 Oregon, and 2 silvers and 1 king were taken at 

 two stations off the mouth of the Columbia 

 River. 



LENGTH FREQUENCIES 



In figure 16 the fork lengths of 1,052 

 salmon (all species) caught by the John N . Cobb 

 are shown in frequency distributions according 

 to mesh size. Similarly the length frequencies 

 of all salmon caught by the Mitkof and Paragon 

 are graphed in figures 17 and 18, respectively. 



The various mesh sizes were selective 

 for particular size ranges of salmon, but con- 

 siderable overlapping of the size distribution of 

 salmon occurred in the catches of the different 

 nets. The sizes of fish taken by each mesh 

 were in part dependent on the sizes of fish avail- 

 able to the nets, and the length frequencies 

 which are shown represent size selectivity over 

 a wide range of area and time . 



In figure 19 the fork lengths of all sal- 

 mon caught by the Cobb during the entire season 

 segregated according to species are shown. 

 Likewise, the seasonal length frequencies of 

 each species of salmon taken by the Mitkof and 

 Paragon are given in figures 20 and 21, respec- 

 tively. 



These length -frequency data along with 

 age readings from the scales and with the size 

 and development of the ovaries and testes are 

 being analyzed for a later report. The complete 

 morphological and physiological racial analyses 

 of the ocean catches of the three research ves- 

 sels will aid in evaluating the extent of inter- 

 mingling of North American and Asian stocks of 

 salmon. 



LITERATURE CITED 



Fukuhara, Francis M. 



1953. Japanese 1952 North Pacific salmon- 

 fishing expedition. Dept. of the 

 Interior, Fish and Wildlife Service, 

 Commercial Fisheries Review, 

 vol. 15, no. 2, 1953, 17 pp., 7 figs. 



Schaefers, Edward A., and Francis M. Fukuhara 



1954. Offshore salmon explorations adja- 

 cent to the Aleutian Islands, June- 

 July 1953. Dept. of the Interior, 

 Fish and Wildlife Service, Commer- 

 cial Fisheries Review, Sep. No. 

 371, vol. 16, no. 5, May 1954, 



20 pp . , 16 figs . , 5 tables . 



Figure 15. --This group of red salmon illustrates the size range of 

 fish taken in one gill-net set by the John N. Cobb . 



2k 



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