Pisces. 167 



to increase greatly the world's food supply. It remains to be 

 seen what can be done toward getting rid of the more 

 voracious fishes that destroy so many of the young of the 

 food fishes. The pfkes, including the pickerel and mas- 

 calonge of the tributaries of the Mississippi and St. Law- 

 rence, must greatly reduce the numbers of more valuable 

 fishes. If they were to increase rapidly, they might nearly 

 deplete the waters, so active and voracious are they. 



