HABITS OF TEE HERRING AND SHAD. 451 



spring in immense schools, in which the females are three 

 times as numerous as the males, to spawn, selecting shoal 

 water from three to four fathoms deep in bays, where the 

 eggs hatch. At this season, and early in the summer, hun- 

 dreds of millions are caught, especially on the Canadian, 

 A'ewfoundland, and Labrador coasts. The English white- 

 bait is the young of the herring. The herring is caught in 

 deep nets with meshes large enough to capture individuals 

 of ordinary size, the nets haying a finer mesh than those 

 used for the mackerel fisherj'. 



The alewife and shad are said to be ancidromous, from 

 their habit early in spring of visiting the coast and ascend- 

 ing rivers in vast numbers to spawn. The eggs are of mod- 

 erate size ; the ovaries are said to contain about 25,000, and 



Fig. 411.— The Hurring, Clupea fiareng-is, one third natural size.— From the Ameri- 

 can Katuralist. 



at times as many as 100,000 or 150,000 eggs. They are dis- 

 charged near the surface, sinking slowly to the bottom. 

 The time between impregnation and liatching varies from 

 about three to six days, according to the temperature. The 

 shad eats little or nothing in freshwater, being then engaged 

 in the act of reproduction. In the sea they live on small 

 Crustaceans, such as Mi/sis, etc. The menhaden is now put 

 up as a substitute for sardines, and is of great value as fish- 

 bait, especially in the mackerel fishery, and for its oil. 



The family Sahnonidce comprises the salmon, trout, and 

 wliitefish. with a number of species and varieties. The 

 species of the genus Sahno have not more than eleven rays 

 to the anal fin, while the salmon of the west coast, quinnat, 



