OF GREAT BRITAIN. 51 



Trout frequenting opposite sides of the same river 

 or loch. 



Amongst special breeds of Trout which have in 

 process of time, owing to local circumstances of 

 food, &c., acquired certain well-marked, and, so to 

 speak, permanent, peculiarities, may be mentioned 

 the Trout of Loch Leven, in Scotland ; the Gil- 

 laroo Trout of Ireland; and the Boding found in 

 some of the Cumberland lakes. The Botling is 

 described by Dr. Davy, in his " Angler in the 

 Lake District," as ascending the lake streams in 

 the autumn, and as being a tierce, powerful fish, 

 frequently attacking the other Salnwnidcc whilst 

 spawning. In form, it is short and deep, with the 

 lower jaw much hooked, or curved upwards ; and 

 when full-grown, its girth considerably exceeds its 

 length. In the arrangement of its teeth and spots 

 it resembles closely the ordinary type of Trout. 



The largest of the Irish lakes, Loup;h Neafrh, as 

 well as L. Bofin, L. Corrib, L. Mask, and others, 

 produce a Trout which has been by some natura- 

 lists too hastily considered as a distinct species — 

 the Gillaroo. The inner coats of the stomach in 

 this fish are considerably thickened, so as to afford 

 increased muscular power, and the teeth are re- 

 markably small ; but beyond these, and the mere 

 divergences in external form, so little difference 

 appears to exist between it and the common 

 English Trout as to lead to the conclusion that 

 the Gillaroo is only a variety of that species. 



