GROUP BEHAVIOR 165 



at least at times, in causing grouped fish to learn 

 more rapidly in a simple aquarium-maze than iso- 

 lated fishes under similar treatment. 



As the goldfish move forward in the usual divided 



ojo.i' 



e SEW\RATinG GROUPS 

 O COHERIMQ GROUPS 



TR»AL 5 10 J5 19 



Fig. 35. Cyprinodon learn to move in a body more 

 readily than to split into two separate groups. (From 

 Welty.) 



aquarium there comes a time when one or more fish 

 may be in front of the screen, and the others in the 

 rear of this advance guard. It was obviously a part 

 of the investigation to find the effect these more 

 rapidly reacting fish had upon their fellows merely 

 as a result of being in the forward chamber. Con- 

 ceivably they may have served as a lure. Another pos- 



