. British and Irish Salmonidæ. und in reference to the outward silvery appearance of the fish in question, both Dr. Giintherand Professor Young state that the silvery coat with which these fishes are clothed is to be regardedas a distinctive mark of their being migratory fish of the salmon kind. The assumption of thesilvery coat .... in the case of river fish, is to be held an almost infallible test of a migratoryand sea-going habit. Nor is this inconsistent with the well-known fact, that in the case of certainfish which inhabit lochs having now no communication with the sea, a similar silvery
. British and Irish Salmonidæ. und in reference to the outward silvery appearance of the fish in question, both Dr. Giintherand Professor Young state that the silvery coat with which these fishes are clothed is to be regardedas a distinctive mark of their being migratory fish of the salmon kind. The assumption of thesilvery coat .... in the case of river fish, is to be held an almost infallible test of a migratoryand sea-going habit. Nor is this inconsistent with the well-known fact, that in the case of certainfish which inhabit lochs having now no communication with the sea, a similar silvery appearanceis to be seen. In the case of the Lochleven trout, which affords the most notable example ofthe phenomenon referred to, it must, however, be kept in view, as having an important bearingon the character of this fish, that the loch which it inhabits had, most probably, at one time acommunication with the sea, and that the fish themselves possess in a most reraarkaWe degree FRESH-WATER TROUT—LOCELEVENS DESCRIBED. 221. ?^^^n^ Fig. 49. Maxilla of female trout. 1, specimen from Otago, 19-2 2, specimen of Lochleveu trout from Howietoun, 20 in. long. troiit, as, for instance, those in Sutherlandsliire, this difference is not so will similarly be seen to be the case on comparing the jaw of a laro-e femalebrook trout with that of a Lochleven. But it is evident that in Lochlevensreared at Howietoun, the males have not such strong jaws or teeth as those livingin a wild condition, which is probably owing to their having from their earliestexistence had food provided for them. Also as regards trout, very probably ao-eshould also be taken into consideration as well as size, for a large four-year-oldHowietoun male would probably be less strongly armed than a similarlj- sized iishwhich had been reared in a loch or stream, and which had most likely taken agreater number of years to attain to the same size. Likewise, when examinino-this subject, care must be ta
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