Nichol: Effects of geography and bathymetry on growth and maturity of Pleuronectes asper 
501 
Table 5 
Logistic regression coefficients for the equation MAT=l/( 1 + + P A + “ area + s-d + aa-D)^ re l a ting female yellowfin maturity status 
to fish age (A), binary variable area (northwest or southeast), and continuous variable depth (D). Ax D denotes the interaction 
between age and depth. SE= standard error of the estimate. A x D and age coefficients were considered nonsignificant (P>0.05) 
and were therefore removed from the model. Remaining coefficients and estimates result from model runs with A x D and age removed 
(underlined values). 
Year 2 
n 
Variable 
Coefficient 
Symbol 
Estimate 
SE 
P > chi-square 
1992-94 
929 
Age 
P 
-0.70 
0.048 
0.0001 
Area 
a 
0.38 
0.21 
0.080 
Depth 
5 
0.032 
0.0056 
0.0001 
A x D 
A 
-0.0040 
0.0021 
0.054 
Intercept 
P 
6.25 
0.50 
0.0001 
1 Data were pooled among years 1992-94. 
Bottom depth (m) 
Figure 6 
Mean bottom temperatures of the southeast and north- 
west areas of the eastern Bering Sea shelf, averaged 
across years 1982-94 at 10 m bottom depth intervals. 
Error bars indicate 95% confidence intervals. 
of individual growth and length or age at maturity. 
This estimation assumes that there is no between 
year-class growth or maturity differences with re- 
spect to a given age and that samples within each 
age class are random with respect to the population 
