2-year-in-ocean reds in the 41- to 62-centi- 

 meter interval. The bulk of the Mitkof's 

 reds were taken in the North Pacific, south 

 of the western Aleutians. 



The Tordenskjold 's red salmon catch 

 exhibits a definite unimodal curve. Of the 

 1,390 red salmon measurements, approximately 

 76 percent were those caught on the two 

 stations south of the Pribilof Islands on 

 June 20 and 21. These were in the majority 

 2-year-in-ocean reds. The absence of small 

 reds during the period from May to September 

 and the capture of large numbers of migrat- 

 ing adult fish at two stations suggest that 

 the eastern Bering Sea and the Bristol Bay 

 area are a migratory path rather than a 

 major feeding ground for red salmon. 



The John N. Cobb's red salmon catch 

 included five fish ranging from 60 to 65 

 centimeters in fork length. 



Chum salmon . — There are several modes 

 in the length frequencies of chum salmon 

 captured by the Celtic , Paragon juid Mitkof , 



CHUM SALMON 



Celtic 

 N-- 1234 



indicating the presence of different age 

 groups within their cireas of operation. 



Age analysis indicates that the Cel - 

 tic 's pronounced bimodal curve is made up 

 of 2nd-year chums in the 33- to 45-centi- 

 meter interval and 3rd-year chums in the 

 46- to 61-centimeter interval, with a very 

 small number of 4th-yeax fish overlapping 

 the latter in length. 



Chums caught by the Paragon operating 

 south of the Alaska Peninsula and eastern 

 Aleutians, during the same period as the 

 Celtic (mid-July to mid-Stptember ) , exhibit 

 a pronounced mode in the 43- to 70-centi- 

 meter length interval. This mode includes 

 63 percent 3rd-year chums and 37 percent 

 4th-year chums. The 2nd-year chums fall in 

 the 31- to 42-centimeter interval. 



A distinct group of 2nd-year chums is 

 found in the 28- to 35-centimeter interval 

 of the Mitkof 's catch. These fish, with the 

 exception of one, were caught in the central 

 Bering Sea from July 6 to 15. The remaining 

 group, in the 36- to 71-centimeter interval, 

 is composed of 2nd-, 3rd- and 4th-year chums 

 with a great degree of overlap in length. 



The unimodal curve of the Tordenskjold 's 

 catch is composed largely of mature 4th-year 

 chums. The absence of small chums from May 



PINK SALMON 



35 40 45 50 55 



Fork Length in Centimeters 



40 45 50 55 60 



Fork Lengtti in Centimeters 



65 



Figure I3. --Length frequency distributions 

 of chum salmon taken by four vessels. 



Figure l4. --Length frequency distributions 

 of pink salmon taken by four vessels. 



17 



