LEWIS and YERGER: BIOLOGY OF FIVE SEAROBINS 



Table 2. — The relationship of bottom type to density for five species of trigHds. 



Type P 



Type in 



'Type I = coarse sand bottom overlain withi shell hash. Type II = fine sandy mud, silt or clay bottom. 

 ^N = the number of 10-min trawling intervals within the depth and geographic range of the species 

 ^For one factor analysis of the variance for data transformed to V = log(X + 1). 

 •Significant at P<;-0.025. 



Table 3. — Comparison of day versus night trawling for five species of triglids. 



'A/ = the number of 10-min trawling intervals within the species' depth and geographic range 

 ^For one factor analysis of the variance for data transformed to V = log(X + 1). 

 •Significant at P< 0,001. 



Table 4. — Percent of total stomach contents for the juveniles 

 of five species of searobins (n = the number of stomachs that 

 contained identifiable remains). 



Table 5. — Percent of total stomach contents for the adults of 

 five species of searobins ( n = the number of stomachs exam- 

 ined that contained identifiable remains). 



and those collected in July 1971 were not ripe, 

 indicating that spawning ceased somewhere dur- 

 ing this interval. 



Prionotus alatus fed primarily on crustaceans 

 (91 to 97% of total stomach contents). Juveniles 

 (Table 4) fed on decapods, amphipods, mysids, and 

 stomatopods; adults (Table 5), chiefly on decapods. 

 Small fishes (usually less than 15 mm SL) made 

 up the only substantive non-crustacean food item 

 in both adults and juveniles. 



Prionotus roseus Jordan and Evermann 

 Bluespotted Searobin 



Specimens of P. roseus ranging in size from 240 

 to 170 mm SL were collected throughout the study 

 area at depths of 20 to 90 m (Figure 4a) and bottom 

 temperatures of 16° to 28°C. It ranked, with P 

 martis, second in density within its depth range 

 (Table 1). 



97 



