638 



Fishery Bulletin 90(4). 1992 



6 vo ^-^ ^" ISLAND 



Figure 9 



CPUE of YOY white seabass A. nobUis by station over the 

 four months (June-October) of the 1989 survey. Stations are 

 grouped into mainland and island sites for comparison. Stns. 

 19 and 20 (Santa Rosa I.) were not sampled in May due to 

 severe weather conditions. 



M^'^' 



Figure 10 



CPUE of YOY white seabass A. nobilis within stations 

 grouped by distance block (MAINLAND = four mainland sta- 

 tions, NEAR ISL = four near-island stations. FAR ISL = 

 four far-island stations) over the four months (May-August) 

 of the 1989 survey. 



Comparison of 1988 and 1989 

 at four mainland stations 



Settlement success in 1988 was compared with that in 

 1989 by examining the catch at the four mainland sta- 

 tions sampled during both years (Fig. 12). Abundance 

 varied significantly among months over the two sum- 

 mers (one-way ANOVA; F 2.52; 8,27df; p<0.05), but 

 not among stations. Settlement among the four sta- 

 tions was consistent during 1988, but highly variable 

 in 1989. Also, CPUE was higher in 1988 (0.75/tow) than 

 in 1989 (0.59/tow) but the difference was not signifi- 

 cant (^test;< 1.23; 15df;p 0.24). Catches differed most 

 between years at Stn. 13 (Belmont Shore) where abun- 

 dance dropped from 0.78/tow in 1988 to 0.06/tow in 



NV.\^' 



Figure 1 1 



Abundance of YOY white seabass .4. nobilis by depth over 

 the four months (June-October) of the 1989 survey. 



^grsTVlR^ 



Figure 12 



CPUE of YOY' white seabass .4. nobilis at each of four 

 mainland stations by month over the summers of 1988 and 

 1989. (Stn. 6 = VENTURA. Stn. 10 = MALIBU. Stn. 13 = 

 BELMONT. Stn. 15 = LACUNA). 



1989, and at Stn. 15 (Laguna Beach) where abundance 

 increased from 0.78/tow to 1.21/tow. The lack of signifi- 

 cant differences in catches between 1988 and 1989 was 

 probably due to the high variability and low numbers 

 at individual stations within each year. The relatively 

 high catch at Laguna Beach in 1989 was directly op- 

 posed to the lower catches at the other three stations. 



Influence of environmental factors 



Distance from the mainland Of the environmental 

 variables examined, only the distance of the station 

 from the mainland was significantly correlated with 

 CPUE over both years (Table 2), and this correlation 

 was negative. This corroborates the ANOVA results 

 from 1989 where the effect of distance block was highly 



