162 ANIMAL LIFE UNDER WATER 



There are bullies in the fish .world, as in all 

 Other walks of life, and most pools have one 

 fish who is cock o' the walk. 



In the spring of 1911 six rainbow trout were 

 placed in a pond. By the end of the summer 

 one of the fish weighed over a pound, and was 

 considerably heavier than the others. The larger 

 size of this fish was explained by the fact that 

 he seized most of the food. He was the absolute 

 master of the situation, and spent a considerable 

 part of the day chasing and biting his smaller 

 brethren. 



In September three chub, each weighing 

 over two pounds, were added to the occupants 

 of the pond. The rainbow immediately attacked 

 them. The chub were sluggish and were not 

 accustomed to being bullied. At first they 

 could not understand what was required of them 

 when the trout butted and bit them in the back 

 and tail. Within a week, however, the rainbow 

 trout had struck terror into their hearts, and he 

 would spend hours chasing them round the pond. 

 Two chub are shown on the plate opposite as 

 they passed the window of the observation 

 chamber. These fish were escaping while the 

 rainbow attacked the third. The bully of the 



