FISHERY BULLETIN: VOL. 84, NO. 3 



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titioned into gonads, which by age 12 composed 

 nearly all of the annual production (Table 5, col. 8). 

 As the herring grew, the annual product was more 

 closely related to BL than to eviscerated body 

 weight (Table 5, cols. 6, 7), evidence that individual 

 herring in the Alike Bay vicinity may use food more 

 in proportion to their BL than their weight. Further- 

 more, although the relationship between annual 

 product and BL was nearly constant within age 

 groups 3-6 and 8-12 (Table 5, col. 6), productivity 

 was much lower in the 8-12 group. Young Auke Bay 

 herring may be more successful for their size in find- 

 ing food than are older individuals, because impor- 

 tant foods needed by older herring may be scarce 

 in the Auke Bay vicinity, which is about 80 nmi (148 

 km) by water from the open ocean. 



There is indirect evidence from the characteristics 

 of growth and production in Auke Bay herring and 

 growth characteristics of other Pacific herring in the 

 northeastern Pacific Ocean and Bering Sea that not 

 only growth but the annual product relative to her- 

 ring size and the partitioning of the annual product 

 may vary with the population. If the relationship 

 between eviscerated weight and BL in Auke Bay 

 herring is used with growth data of Pacific herring 

 from other locales in the eastern Pacific Ocean and 

 Bering Sea (Table 1), striking differences are visi- 

 ble in the annual product of eviscerated weight (Fig. 

 9). For example, if 190 mm herring (3-yr-olds) in the 

 Bering Sea produce gonads in the same proportion 

 to eviscerated weight as 190 mm herring in Auke 

 Bay (5-yr-olds; Table 5, col. 8), gonads and 

 eviscerated weight would each form about one-half 

 of the annual product of Bering Sea herring. How- 

 ever, this proportion would be much too high for 

 herring in Bering Sea during their first year of 

 gonad production, according to the model based on 

 Auke Bay herring, if Bering Sea herring mature as 

 2- or 3-yr-olds. If production of eviscerated weight 

 and gonads is scheduled according to age, rather 

 than proportion of annual product, similar conflicts 

 result; thus, Pacific herring from different regions 

 probably differ in characteristics for production of 

 eviscerated weight and gonads. 



CONCLUSIONS 



Pacific herring grow in the eastern Pacific Ocean 

 according to the constant-proportion model; i.e., 

 growth in one year is a constant proportion of the 

 amount grown the previous year. Growth stanzas 

 (regions of constant growth parameters) for juve- 

 niles and adults usually inflect near age 2, and the 

 change in growth is probably related to sexual 



718 



