FISHERY BULLETIN: VOL, 77. NO. 1 



60 T SHELIKOF STRAIT REGION 

 MAY-JUNE 1973 



MALE I, =55.97 [l.e-""*""] 

 fEMALEl,= 56.04[l-e-^^"*°^'] 



S.E KODIAK REGION 

 MAY- JUNE 1973 



. MALE l, = 52.27[l-.-'0"*-°2l] 

 PEMALEI, = 59.79[l-e-""+-°«'] 



60t S.E KODIAK REGION 

 AUG - SEPT 1973 



50 



X 40 



H 



O 



UJ 



O 



30 



20- 



T — r — T — T — T ' — ^ ^ \ 1 1 



2 17 4.17 6.17 8.17 10.17 



CHIRIKOF REGION 

 SEPT - OCT 1973 



MALE I, = 4850 [l-e ""•'»'] 

 FEMALE I, '53.12 [l-e"-""*-"'] 



O O 



MA.EI, .49.85[l-e--'^"*°°'] 

 FEMALE I,. 5IS7[l-e--»'--°2l] 



242 442 6.42 8.42 1042 12.42 



60-, SANAK-UNALASKA REGION 

 JULY -AUG 1974 



O o 



MALE I, =4a95[i-e"*«"--°^'] 



FEMALE I, .54.29 [l-e^"*-°"] 



— 1 ] r 1 f \ 1 1 1 



^■. 4.5 6 5 8 5 10.5 



CHIRIKOF REGION 

 JULY 1975 



SHELIKOF STRAIT REGION 

 AUG.- SEPT. 1973 



* A '^ 

 - *^ ° ° A 



MALE I, = 45.0l[l-e''"" °^'] 

 FEMALE I, =4769[l-e--""*'»'] 



1 1 < 1 1 ] \ \ 1 1 ' 



2.42 4 42 6 42 8.42 10.42 12.42 



SANAK-UNALASKA REGION 

 MAY- JUNE 1974 



MALEl, = 5l.65Ll-e""""'^'J 

 FEMALE I,=57e5[l-e'"""''"'] 



MALE 1, ■4765[l-e"' "'J 

 FEMAL£ l,= 52.52[l-e-^»"*-°"] 



— ] 1 ] 1 1 1 ] 1 1 1 1 



2 17 4.17 6.17 817 10 17 12.17 



KENAI REGION 

 JULY- AUG. 1975 



MALE li=54.59|l-e' 



I. =54.27[l4-""*' 



2.42 4.42 6 42 8 42 IQ42 12 42 



2 25 4.25 6.25 8.25 10.25 12.25 



33 1033 12.33 



AGE ( yeors) 



Figure 6.— Growth curves of male and female walleye pollock by survey region and season in the western Gulf of Alaska, 1973-75. 



0.25, 0.41; females, 0.26. 0.39). The arithmetic 

 means of A' in Table 2 lages 2-8) are 0.33 and 0.30 

 and the geometric means of L ,. 50.39 and 54.06 cm 

 for males and females, respectively. Significant 

 negative correlation between In L„ and \K \ was 

 found in both sexes. The highest observed ages in 

 each survey lie, on the average, between those 

 ages when growth is theoretically between 95 and 

 97.5'/^ complete, according to the growth parame- 



ters for ages 2-8 in Table 2. Similarity in this 

 regard is considered essential in estimating aver- 

 age natural mortality rates from empirical data 

 (Alverson and Carney 1975i. 



Yield Relations 



For management purposes natural mortality 

 [M) as well as growth rate is needed for recogni- 



272 



