. British and Irish Salmonidae. Salmon. 166 ^ Of BRITAIN. whereas others appear to ignore size, holding the Truff to_ be a young sea tront. The average weight of white-fish are said by some authorities to be from half to three quarters of a pound. In two examples 12'4 and 13 inches respectively in length from the Teign, the gill-covers and form of the head resemble what has been described in the TrufE of the Dart, and likewise agree with small specimens of the Welsh sewin. Teeth—in the smaller example eleven are present along the body of the vomer and five along the hind margin of the
. British and Irish Salmonidae. Salmon. 166 ^ Of BRITAIN. whereas others appear to ignore size, holding the Truff to_ be a young sea tront. The average weight of white-fish are said by some authorities to be from half to three quarters of a pound. In two examples 12'4 and 13 inches respectively in length from the Teign, the gill-covers and form of the head resemble what has been described in the TrufE of the Dart, and likewise agree with small specimens of the Welsh sewin. Teeth—in the smaller example eleven are present along the body of the vomer and five along the hind margin of the head of that bone. In the example 13 inches long, there are four teeth along the body of the vomer, and three on the hind margin of its head. One had 36, the other 37 csecal appendages. Colours—the largest had much fewer spots on the body and fins than the Dart TrufE. Some have considered it very improbable that the Welsh sewin, so excellent as food, could be identical with the white-fleshed and insipid* Teign or Dart fish, but alterations as considerable in the value of the flesh of the northern whitling and other local races of sea trout have been observed. While we find as great variations in our brook trout, in accordance with the character of the waters they inhabit and the amount or quality of food they are able to obtain. But, differing as these races do among themselves, whether in size, colour, or even in some structural points, the offspring, if placed in suitable surroundings, may improve, while, on the other hand, the finest breeds will deteriorate in unsuitable places. Should, however, any temporary cause, as mine-water in Devonshire rivers, (see pp. 55 ante,) have injured the local race of fish, and this cause has been removed, it perhaps becomes worthy of consideration whether it might not be advisable to obtain the progeny of a faier breed from elsewhere and introduce them into the water, instead of waiting for the improvement of the local deteriorated form
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