FISHERY BULLETIN: VOL. 81. NO. 1 



Table 2.— Estimates and standard errors for the von Bertalanffy constants. 



Site 



code K L^ to Logio(w) + 95% confidence interval 



TS 



AR 



NR 



RB 



WP 



Q1 



Q2 



SR 



WK 



CR 



AH 



WF 



NB 



EG 



WC 



PT 



Dl 



SH 



RS 



PI 



0.2530 

 0.2740 

 3016 

 0.1829 

 02992 

 0.1175 

 0.1069 

 0.2119 

 0.1811 

 0.1997 

 0.0903 

 0.0917 

 0.1532 

 0.1377 

 0.1411 

 1468 

 0.1255 

 00565 

 0.1623 

 00986 



(00597) 

 (0.0520) 

 (0.0162) 

 (00986) 

 (0.0114) 

 (0.0194) 

 (0.0134) 

 (0.0229) 

 (0 0155) 

 (0.0114) 

 (0.0184) 

 (0.0162) 

 (00198) 

 (0 0425) 

 (00246) 

 (0.0077) 

 (0.0114) 

 (00083) 

 (00287) 

 (0 0248) 



111.05 



107.13 

 7969 

 81.50 

 73.27 

 93.23 



1 1 1 .00 

 72.34 



111 80 

 97.75 



113.20 



13673 

 8928 

 91.95 

 87 18 

 67.91 

 67 96 



135.71 

 73.13 

 81 55 



(1118) 

 ( 7.22) 

 ( 1.10) 

 (22.08) 

 ( 0.89) 

 ( 9.20) 

 ( 696) 

 ( 2.48) 

 ( 4.21) 

 ( 1.60) 

 (13.11) 

 (1488) 

 ( 4.30) 

 (18.20) 

 ( 7.37) 

 ( 1.39) 

 ( 2.46) 

 (12.34) 

 ( 4.52) 

 (1078) 



-1.188 

 -1.440 

 -0.718 

 -1.450 

 -0 400 

 -1.104 

 -1.205 

 -0.445 

 -0436 

 -0 990 

 -1.668 

 -1.357 

 -1.571 

 -0.914 

 -1.549 

 0.836 

 -0.781 

 -0980 

 -0.745 

 -0.171 



(0263) 

 (0.268) 

 (0.095) 

 (0.558) 

 (0.058) 

 (0.148) 

 (0.191) 

 (0.225) 

 (0.127) 

 (0.143) 

 (0.288) 

 (0.184) 

 (0.304) 

 (0.186) 

 (0.236) 

 (0.122) 

 (0.218) 

 (0.336) 

 (0.434) 

 (0.432) 



1.4486 

 1.4677 

 1 3808 

 1.1734 

 1.3418 

 1.0396 

 1.0743 

 1.1855 

 1.3066 

 1.2905 

 1.0095 

 1 0982 

 1.1360 

 1.1025 

 1 .0899 

 9986 

 0.9311 

 08847 

 1.0754 

 09053 



1 3839 

 1.4166 



1.3473 

 1.1202 

 1.3253 

 09848 

 1.0045 

 1.1417 

 1.2724 

 1.2512 

 0.9147 

 1 0056 

 1.0902 

 1 0439 

 09965 

 09778 

 08974 

 07663 

 1.0275 

 07839 



1.5050 



1.5134 



1.4119 



1.2207 



1 3577 



1.0882 



1.1344 



1.2253 



-1.3383 



1.3265 



-1.0873 



-1.1746 



-1.1774 



-1.1541 



1.1668 



1.0186 



-0.9623 



•0.9776 



1.1167 



09674 



The first component is interpreted as repre- 

 senting latitude, since the major contributing 

 variables vary with latitude. Average annual 

 temperature, as might be expected, shows the 

 highest correlation. It decreases with latitude. 

 To avoid confusion the first component will be re- 

 ferred to as "northness." The second component 

 is sediment siltiness. Grain size (negatively cor- 

 related) and percent silt-clay (positively cor- 

 related) are the main contributing variables. 

 The high correlation of salinity may reflect the 

 role of flocculation and estuarine circulation in 

 the distribution of silts and clays in estuarine 

 sediments (Krumbein and Sloss 1963; Knauss 

 1978). The third component, positively correlated 

 with hydrocarbons and percent silt-clay, is sedi- 

 mentary hydrocarbons. The higher silt-clay com- 

 ponent (also reflected to some degree by positive 

 skewness) provides a greater sedimentary sur- 

 face area for the retention of hydrocarbons (Ly tie 

 and Lytle 1977). 



The first three components were used for the 



further analysis of growth to try and deduce fac- 

 tors which could have contributed to the latitudi- 

 nal trend and to point out secondary growth 

 affecting factors. Several sites were omitted 

 from this analysis because missing values pre- 

 cluded the calculation of the component scores. 

 The results of the stepwise regression analysis 

 are given in Table 4. As expected, growth was 

 found to be negatively correlated with northness. 

 The second regression showed a negative rela- 

 tionship between siltiness and growth. The last 



Table 4.— Results of the stepwise regression of growth (w) on 

 the first three principal components. The slope of the predictive 

 regression (6) can be found by 6 = vr. 



Regression 



Intercept v = slope 



Approximate 95% 

 confidence limits 



Log,o(w) vs. 



northness 0.693 



1st residual vs. 



siltiness 0.184 



2d residual vs 



sedimentary 



hydrocarbons 0217 



1.1137 -0.1653 -0.2269<v<-0 1037 

 -0.0112 -0.1116 -0.1682<v<-0 0549 



00065 -0.1472 -0 2214<v<-0.0730 



80 



