GENERA AND SPECIES. 13! 



to Loch Leven, but it has been largely bred in the fish farms and 

 widely distributed in the streams, where it interbreeds with the 

 common trout. In the original strain its flesh is very red, and it 

 has been caught up to iSlbs. in weight. 



The Grey Trout has 14 rays in the dorsal, 12 in the anal, 19 in 

 the caudal, 13 in the pectorals, and 9 in the ventrals. It has a 

 broad, strong maxillary, and large scales on the tail, and is peculiar 

 to Loch Stenness in the Orkneys. It is hardly distinguishable from 

 the Lake Trout, except in the number of its pyloric appendages. 



The Sea Trout is one of the three or four species known as 

 Salmon Trout. It has from 12 to 14 rays in its dorsal, n to 13 in its 

 anal, 18 or 19 in its caudal, 13 or 14 in its pectorals, and 9 in its 

 ventrals. The ventrals are generally under the last third of the 

 dorsal. The lateral line has from 115 to 130 scales. The mouth 

 extends beyond the eye, and the body is rather long and slender. 

 In colour it is bluish grey, with a purple gloss on the sides, and it is 

 dotted with black spots and crosses over the upper body. It ranges 

 to 4 feet in length. 



The Bull Trout, or the chief of so-called Bull Trout, for in this case, 

 as in others, the name is not restricted to the same fish, has fin rays 

 the same as those of the Sea Trout, and like it, varies so much that 

 the only external difference seems to be in the colour of the sides, 

 which are brownish instead of silvery. 



The Blue Poll, otherwise the White Salmon, Whitling, or Herling 

 is very long in the body. It also has a similar fin formula to the 

 foregoing (D. 12-14; A. 11-13 5 c * 18-19; p - I3- J 4 5 v. 9). In colour it is 

 mainly silvery, with a few black spots. 



The Lake Trout has 14 rays in its dorsal, 10 or 11 in its anal, 

 19 in its caudal, 13 in its pectorals, and 9 in its ventrals. It feeds 

 mainly on fish, hence it has large fins and large teeth. Its head is 

 of moderate size, but the snout is long, and in the males is hooked 

 in the breeding season. In colour it is generally rather dark ; in 

 length it reaches 31 inches. 



The Hog-backed Trout has 14 rays in its dorsal, 12 in its anal, 

 19 in its caudal, 13 in its pectorals, and 9 in its ventrals. The head 

 is small, the snout rather short, and the lower jaw has not been 

 observed to bear a hook in the breeding season. It has not been 

 found over 16 inches long, but that may not be its full size. It re- 

 sembles No. 203 in almost every respect that has not been mentioned, 



The Gillaroo Trout is found in the Irish loughs, and has the 

 middle coat of its stomach thickened, owing to its feeding princi- 

 pally on molluscs. There are no other distinctions except those 

 given above. 



The Sewen has from 12 to 14 rays in its dorsal, n to 13 in its 

 anal, 18 or 19 in its caudal, 13 or 14 in its pectorals, and 9 in its 

 ventrals. It is rather long in the body. The lower jaw does not 

 always become hooked in the breeding season, when the colour, 

 which is bluish or greenish grey, becomes a sort of brownish orange 

 in the males. There are always a few black crosses above the lateral 

 line. 



