248 



HOW DO WE CLASSIFY ANIMALS? 



toadfish, etc., make nests, but usually the eggs are left to develop 

 by themselves, sometimes attached to some submerged object, but 

 more frequently free in the water. Some eggs which have a tiny 

 oil drop are buoyed up to the surface, where the heat of the sun 





\ 



— yoik 



.recently* 



yzxtcbed -'larva 



1.5 mm. 



dgelopin£ 



<//Zs 



% 



sevens! \faotitbs dd 



U. S. Bureau of Fisheri 



The pigfish or hogfish is a bony fish. It is found from New York to Mexico. The eggs are 

 laid in the early spring, and may hatch within 2 or 3 days. A recently hatched larva is about 

 1.5 millimeters long. A young fish of several months is 26 or more millimeters long. 



aids development. Both eggs and developing fish are exposed to 

 many dangers, and are eaten, not only by birds, fish of other 

 species, and other water inhabitants, but also by their own 

 relatives and even parents. Consequently very few of the eggs 

 ever reach maturity. 



