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Figure 4 
Standard lengths of each species; n = number of specimens measured. 
The proportional residuals were positively correlated 
with hour of capture after dusk for six species and 
negatively correlated with turbidity for five species. 
As an example, the regressions of abundance of B. 
tyrannus on each environmental condition are shown 
in Figure 9. Significant correlations for this species 
were found with tidal amplitude, current speed, moon 
phase (=spring vs. neap tide), water clarity, and hours 
after dark when sampling occurred. Paralichthys 
dentatus, however, exhibited no correlations. 
As would be expected, there were significant cor- 
relations between the nine environmental variables. 
The highest was between tidal amplitude and sur- 
face current (0.60), and the next highest was between 
atmospheric pressure and wind velocity (-0.44). How- 
ever a principal components analysis yielded four 
