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STANDARD LENGTH (mm) 



60 



Figure l. — Relationship of initial fish length with measured 

 growth rates during A) 16L:8D experiments, B) 12L:12D experi- 

 ments. Triangles represent values for fish acclimated to 10° C; 

 dots, 15° C; squares, 20° C. 



12 14 16 18 



TEMPERATURE CO 



20 



Figure 2. — Growth response surfaces for given isopleths of ini- 

 tial standard length as predicted by the multiple regression 

 models. A) 16L:8D experiments, B) 12L:12D experiments. 



nodal point where fish of all initial lengths are 

 characterized by the same growth rate (Figure 

 2 A). Below that temperature, growth increases 

 with increasing length, whereas at higher tem- 

 peratures, it decreases with increasing length. 

 The response of growth to photoperiod indicates a 

 generally positive relationship (Figure 2A, B), 

 with faster growth under most conditions at 

 16L:8D. Growth with length at all temperatures at 



Table 2. — Coefficients and related statistics for the growth 

 response models for laboratory growth in Sebastes diploproa. 

 Multiple correlation coefficients (/?) were 0.919 and 0.933 for 

 12L:12D and 16L:8D, re.spectively 



12L:12D and at higher temperatures at 16L:8D 

 decreases with length, suggesting a 

 temperature-dependent asymptote for growth. For 

 low temperatures at 16L:8D, however, growth in- 

 creases with length and no asymptote is apparent. 

 Growth of fish collected in the field was deter- 

 mined from daily growth increments. Otoliths 

 from 53 specimens were processed as described. 

 Due to broken or unclear otoliths, loss of material 

 from the margin during grinding, or failure to 

 meet the criterion of consistency in age from the 

 three readings, 21 ages were determined. These 21 

 fish were collected in April (6), August (2). Sep- 

 tember (3), October (1), and December (9) from 

 1973 through 1978. Thus a variety of surface 

 temperatures and thermal histories were experi- 

 enced by these fish. Fish ranged from 9.0 to 42.7 

 mm SL; the age ranged from 43 to 205 d. The 

 resultant pattern of growth in the field was linear 

 over the size range studied ( Figure 3). The growth 

 rates for these specimens, averaged over the 



791 



