320 Modern Fishculture in Fresh and Salt Water. 



private ponds require. The State of New York had 

 one on the Hudson, at Troy, but it was poorly made, 

 was bolted to the apron of the dam, a^d, when that 



S 



FORMS OF FISH WAYS. 



floated up, the foot of the fishway was in the air. The 

 figures show several models for retarding the water. 



CHAPTER XLV: 



FISHES WHICH GUARD THEIR YOUNG. 



A correspondent asks: "Is there any other fish be- 

 sides the dogfish which guards its young?" He refers 

 to the fresh-water dogfish, Ainia cak'a, called in the 

 West and South lawyer, bowfin, John A. Grindle and 



