QUAST: BODY WEIGHT, FAT, AND GONADS OF PACIFIC HERRING 



• AUKE BAY, BACK-CALCULATED (THIS STUDY) 



*" * TOM ALES BAY, CALIF., TERMINAL LENGTHS (SPRATT 1981) 



° BERING SEA, BACK-CALCULATED (THIS STUDY) 



A * BERING SEA, BACK-CALCULATED (NAUMENKO 1979) 



50 



100 



BL. 



150 

 (MM) 



200 



250 



Figure 3.— Examples of Walford trends in body length of Pacific herring from widely separated locales in the eastern Pacific Ocean 

 and Bering Sea. Heavy solid line through origin is the line of zero growth, and numbered points indicate ages in years. Adult stanzas 

 were fit by least squares, and the juvenile stanzas were fit by eye. Data from Naumenko (1979) represent 25 yr of collections. 



effective range of BL's was limited (near 50 mm) 

 in his data sets and his data were grouped in 10 mm 

 size classes. (In contrast, BL's extended over about 

 130 mm in the Auke Bay herring, and lengths were 

 taken to 1 mm.) 



In Pacific herring, the relationship between evis- 

 cerated weight and BL varies with season and sex 

 (Fig. 5), and the relationship for Atlantic herring 

 should vary similarly. Although Hickling (1940) con- 

 cluded that regressions of eviscerated weight on BL 



differed by sex in Atlantic herring (W = 0.0661 



BL 2 



312 



in 



males, and W = 1.1471 BL 1 - 456 



in 



females), his samples probably were too restricted 

 seasonally to estimate reliably the relationship be- 

 tween eviscerated weight and BL for all seasons. 

 Because of seasonal variation in fat content of the 

 musculature (discussed in the next section), data for 

 a single season cannot represent an average over 

 all seasons in Pacific or Atlantic herring of either 

 sex. 



711 



