BREEDING HABITS OF FISH. 



water while the tail is bent; they are then 



when beii itened that the fish is propelled. 



The movements of the pectorals and ventrals are to 

 tin 1 fish and to elevate and depress it, while the dorsal 

 anal fins steady the body and keep ii upright, like a dorsal 

 and ventral keel. 



Among viviparous bonj fishes are certain ' 



: ibleps and Pcecilia), the eel-like Zo . and the 

 blind-fish of the Mammoth Cave. A small family of ( 

 fornian marine fishes, resembling the sun-fish (Pomol 

 are called bj ^gassiz Embiotocidw, from the fact that they 

 bring forth their young alive. Em 

 which is twenty-seven and a half centimetres (10^ in< 

 long, has been known to produce nineteen young, i 

 aboul Beven and a half centimetres (3 inches) li 



During their breedii ison, many bony fishes, sue] 



the stickleback, salmon, and pike, are more highly 

 than at Hi her times, the males being especially brilliant in 

 their h 



( >RDER8 OF BON'S FlSHES. 



Order 1 Body long ; ventral fins 



either abdominal or wantin 

 :• r 2. Body long, snake-lib 



no ventral lin^ . guilla, 1 



Order :>. Body broad; lips with 



barbels Vi 'hi (Amiurus, Pouts 



i >rder 4 Bi < 1 \ more or less ob 



long (in A fricau i Mormj ru 



Order 5 Body usually com- 

 pressed ; all the bones and tins 



well developed 3a mo, 1 I 



Order 6. Head and moutb vi 



large; pi ctoral tins supported 



by slendi r bones /' ' i b). 



Order 7. Gills tufted; body 1< 



and slender i r/uY(Hip] us). 



Order 8. Bones of upper and lower 



jaw united; often rounded and 



spiny Plectognatfii (Tetrodi D, Mola). 



