o 



D 



> 



X> 



c 



E 



500 



300 



200 



Mustelus canls 



(Smooth Dogfish) 



100-. 



80 



60- 



40- 



20- 



J2 



D 



> 



c 



0) 

 A 



200 



160 



120- 



Pomatomus saltatrlx 



(Bluefish) 



150 



125 



100 



75 



50 



25 







Scomberomorus maculatus 



(Spanish Mackerel) 



reW 3 



Brevoortia tyrannus 



(Atlantic Menhaden) 



350 -i Leiostomus xanthurus 



Spring Summer Fall Winter 



Spring Summer Fall Winter 



Figure 21. Seasonal abundance of common fishes captured in gill nets set near jetties at Murrells Inlet, SC. 

 Histograms show the totals from 3 nets set for 3 hours during each season (data from Van Dolahetal. 1986). 



Lindquist et al . (1985) also found a 

 significant correlation between the mean 

 number of species observed each month 

 (counted in visual transects) and water 

 temperature (r = 0.82, p < 0.01). Van 

 Dolah et al.'s (1986) collections from 

 unmodified crab traps and by rotenone 

 indicated that species number was at a low 

 in the winter, but the relative change was 

 slight compared to that of the other 

 collection methods (Table 1). Figures 16- 

 20 show seasonal change in the total 

 number, and in some cases total mass, of 

 fishes collected by each method. All of 

 these show large decreases in the winter 



even though unmodified crab traps and 

 rotenone collections, again, tended to 

 show smaller relative reductions than did 

 the other collection methods. Rotenone 

 collections focused primarily on small 

 blennies and gobies that are probably less 

 able than the larger species to 

 successfully make the long offshore 

 migration to deeper water. Reasons for 

 the reduced seasonal variation in 

 unmodified crab-trap collections are less 

 apparent. 



Figures 21-25 show seasonal patterns 

 of abundance for the most common species 



27 



