t" 



STilbl I DAY NIGHT 



□ • 



SlAfU 2 "^ [ I Hlfi"^ I 



B C r« EN 



r« EN 



STAGE 3 DAY I NZOHI 



□ ' 



l,e 



'□• 



re EN 



STAGE E OAT NIGHT 



□ • 



Figure 10. Frequency distribution by developmental stage for larval 

 winter flounder collected in day and night samples at 

 each station during 1983. 



collected in the Niantic river, mostly in the mid and upper portion at 

 stations A and B. Laboratory studies (Dr. G. Klein-MacPhee, USEPA-URI, 

 Narragansett , RI, personal communication) have shown an approximate 50% 

 mortality during the transition from yolk-sac absorption to first 

 feeding, so the much lower frequency of Stage 1 larvae compared to Stage 



34 



