A number of these sea trout were marked in the
Tweed ; and two of them have recently been tracked down. One was netted on the Norfolk coast and the other off the shores of Holland. The two examples are enough to prove that the migrations of the sea trout are very much more extensive than was previously thought. It is important that this marking scheme should have wide publicity. It was more or less an accident that the two silver discs were recovered by the markers. In one case by a happy chance a reference to the fish appeared in a local paper which caught the eye of one of our experts on the life of the salmon tribe as charac- tered in the scales. Even if the disc, when recovered, is posted to a Government Department, there is a certain risk that it may be smothered in a pigeon-hole. Both in North America and in Britain, thanks largely to Mr. Jack Miner of Ontario, and Mr. Witherby, each in his own country, we have been able to map out the migration of certain birds. The ringing system has been a continuous success. If we can do the same for fish—and the difficulties are not insuperable —there is likely to be commercial as well as purely scientific value in the study. It needs patience. We should be lucky if one mark in ten thousand proved productive ; but that one may open up a new avenue of biological knowledge.
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