FISHERY BULLETIN VOL. 78, NO. 4 



CD 



E 



10 







10 



^ 



=! 40 



T3 



.- 30 



■o 



- 20 



10 







20 



10 









 



11^ 



X o 



ia^^^^KilMMUi 



JZZL 



O X 



February N = n (I97i: 



March N = 52 (1971) 

 N = 32 (1972) 



April N = 48 (1971) 

 N = 28 (1972) 



May N = 228 (1971) 

 N = 15 (1972) 



June N = 223 (1971) 

 N = 13 (1972) 



iiii ■:-S:g>^ I I C3 cm CZL 



July N = 103 (197i: 

 N = 5 (1972) 



I I i I I I I I I 

 5 10 



rt. 



1 



August N = 7 (1971) 

 N = 3 (1972) 



I ' I' I' I I' I • r t i' I I I I I Id)"' I ' I ' I I ' 'f 



15 20 25 30 35 



Length class (mm) 



Figure a. — Length-frequency histograms of Microgadus proximus larvae collected in 70 cm bongo nets off Oregon in 1971 (unshaded) 

 and 1972 (shaded). X = median length class of larvae in 1971; O = median length class of larvae in 1972. 



three species is the length and position of the an- 

 terior and posterior postanal pigment bars. In M. 

 proximus larvae 5.0-6.0 mm SL (Figure IB), the 

 anterior bar begins just posterior to the anus at 



41-53% SL (myomeres 14-23) and the posterior bar 

 is at 61-74% SL (myomeres 28-39). In T. chalco- 

 gramma larvae of the same size range (Figure 5A), 

 the anterior bar begins posterior to the anus at 



936 



