FISHES. 39 



it is possible to shoot them. Trout are sometimes kept in 

 ponds, where they are fed with bits of liver, small fish, etc., 

 but they can not live unless the pool is kept pure by a 

 constant supply of spring water. The flesh is very ten- 

 der, well tasted, and wholesome. Found in all the north- 

 ern States. 



The Salmon Trout (salmo salvelinus), plate 21, fig. 

 6, is about the same size as a trout; brown above, white 

 on the sides, brilliant yellow below, and is found in all 

 the lakes of Styria, Tyrol, and Switzerland. These, the 

 finest of all the fresh water fishes, are taken either in 

 nets, or by hook and line. 



The Chinese Dart Fish (tachysurus sinensis), plate 

 20, fig. 1, is remarkable for its large dorsal fin; of a 

 green color above, the abdominal and caudal fins brown. 

 It inhabits fresh waters, and is found in all the lakes in 

 China; swims very rapidly, and as this movement is 

 performed by a sudden stroke of the tail, it has received 

 its name of Dartfish. 



The Herring (clupea harengus), plate 21, fig. 3, are 

 about a foot in length ; two inches broad ; have weak 

 teeth ; the upper surface of the body bluish -black, the 

 under silvery. They inhabit the northern seas, and 

 migrate towards the south, forming vast and dense shoals, 

 which, arriving on the coasts, cause the water to shine 

 with metallic brightness. This emigration commences 

 in March and continues until May, during which time 

 they are taken irt incalculable numbers. They feed on 

 spawn, worms, and small maritime animals. 



When the main body of this phalanx is arrived, the 

 fishermen are ready prepared to give them a proper 

 reception, and, by nets made for the occasion, take, 

 sometimes, two thousand barrels at a single draught. 



