SALMON TRIBE. 



493 



The Salmon Tribe, — Family Salmonid^. 



With the salmon tribe, which include the finest and " gamest " of all fresh-water 

 fish, we come to the last group of the true bony fishes, which may be distinguished 

 from the preceding family by the margin of the upper jaw being formed by the pre- 

 maxillae in front and by the maxillae at the sides. As a rule, the body is scaled, 

 while the head is invariably naked: the under surface of the body being rounded. 



SALMON AND SEA-TKOUT (^ liat. size). 



Inhabiting alike salt and fresh-waters, those species which spend a part or the 

 whole of their existence in rivers or lakes are in the main confined to the Temperate 

 and Arctic zones of the Northern Hemisphere, although one outlying genus occurs 

 in New Zealand; and whereas the majority of the marine forms are deep-sea 

 fishes, two genera are entirely pelagic in their habits. A considerable number of 

 the species inhabiting fresh waters descend periodically or occasionally to the sea ; 

 and in some cases it is perhaps rather difficult to say whether these fishes should 

 be regarded as marine or fresh-water. All the salmonoids .ire remarkable for the 



