Table 3. Comparisons of feeding rates for Acartia tonsa (adults, mixed 

 sexes) feeding on labeled Monochrysis lutheri cells in clean 

 water (control) and 500 milligrams 1"^ Patuxent River silt at 

 increasing time intervals. 



Time 



Reduction 

 (percent of control) 



Feeding rate (cells org"-^ day"^) 



(minutes) 



Control 



Patuxent silt 





X ± S.E.- N 



X ± S.-E.j N 



5 



76.81 



262,801 ± 71,939 (9) 



60,906 ± 9,580 (9) 



25 



85.22 



152,200 ± 25,263 (9) 



22,522 ± 4,635 (10) 



125 



77.52 



140,400 ± 24,741 (9) 



31,644 ± 8,176 (10) 



p<0.05. 

 p<0.01. 



33 



