246 



PISCES 



have been utilized in the southern part of the U. S. and, shipped to 

 other countries, have successfully attacked the mosquito larvae 

 there. Top-minnows must be renewed in many places where winter 

 floods carry them away. 



E-Mevirhot 



Fig. 126. J, Fundulus heterocUtus , male. B, Fundulus heteroclitus, female. (F. E. 

 Chidester, Bull. 300, N. J. Exp. Sta., 191 6.) 



The sticklebacks {Gasterosteidae) are interesting because of the 

 nest building of the male. He entices the female to the nest and 

 after she has spawned, he fertilizes the eggs and guards the nest. 

 (Figure 127.) 



Fig. 127. Two-spined stickleback. (From Nichols and Breder.) 



Both the pipe fish and the sea horse {Syngnathidae) are peculiar 

 in that the male carries the eggs in a ventral brood pouch. (Figure 

 128.) Jordan states that the female deposits the eggs on the bottom 

 of the sea and that the male transfers them to his brood pouch. 

 The sea horse is the only fish with a prehensile tail. 



