100 



UJ 

 Q 



90- 



INSECTS 

 CHYCXDRIDS 



80- 



70- 



^ 60-] 



m 

 u 



Ll 



O 40H 



y 3o^ 



on 



u 



^ 20 



10- 







12/16 



OTHERS 



HYDRO- 

 ZOANS 



FISH EGGS 



4/5 



15/17 



OTHERS 

 (OSTRAQODS 



STATO- 

 BLASTS 



HYDRO - 

 ZOANS 



CHIRON- 

 OMIDS 



CYCLO- 

 POIDS 



INSECTS 



CHYDORIDS 



Fl SH EGGS 



15/17 



OTHERS 



STATO- 

 B LASTS 



HYDRO- 

 20ANS 



CHIRON - 

 OMIDS 



CYCLO- 

 POIDS 



INSECTS 



CHYDORIDS 



FISH EGGS 



20/23 



OTHERS 



HYDRO- 

 ZOANS 



CHIRON- 

 OMIDS 



■Y 



CYCLO- 

 POIDS 



INSECTS 



CHYDORIDS 



FISH EGGS 



13/14 



OTHERS 



STATO- 

 B LASTS 



CHIRON- 

 OMIDS 



■Y 



CYCLO- 

 POIDS 



INSECTS 

 ICHYDORIDS 



^ 



FISH EGGS 

 ^ 



4/7 4/11 4/13 



COLLECTION DATES (1980) 



4/19 



Figure 1— Changes in the composition of the combined diet (both males and females) over the five collection dates 

 at Williams' Fishery in April 1980. Numbers above each bar graph indicate number of stomachs with food/total number 

 of stomachs examined. 



square 2x2 contingency table also found signif- 

 icantly greater levels of feeding activity among 

 females (x^ value = 5.86, P < 0.025). The difference 

 in 1980, however, may depend on site. More females 

 had stomach fullnesses >l/4 than males at Rocky 

 Hock (x^ value 6.349, P < 0.025), but the difference 

 was not significant at Williams' Fishery. 



For the three most abundant food items females 

 consumed significantly greater numbers of chydorid 



cladocerans (F = 6.02, P>F = 0.0001), insects (F 

 = 7.64, P>F = 0.0001), and fish eggs (F = 90.15, 

 P>F= 0.0001) than males in 1980. 



Discussion 



Blueback herring spawning in the Chowan River 

 do not stop feeding during their freshwater migra- 

 tions. Williams' Fishery and Rocky Hock Creek are 



714 



