FISH PUZZLE
VARIOUS MARKS PROVE INEFFECTIVE ! NORTH SEA PROBLEM Flow would you mark a codfish so that after it has been returned to the sea it can be identified if it is caught a year later? To track the migration of fish in the sea is an important part of scientific research in connection with the fishing industry, but to get a mark which will stand the action of the North Sea for a year is puzzling investigators, according to a report of the Ministry of Agriculture and Fisheries, England. The investigators have recaptured half the marked fish within a period of 150 days, but it is rare to find any after a year. Painting with pigments was not successful because the fish died. And of 500 fish wearing small brass discs fastened with aluminium wire not one was recaptured. Bone buttons were tried, but they became chalky and brittle. j Silver rods were inserted in the : gill covers of some fish, but these the | Icelandic fishermen overlooked. Cel- | luloid daggers were tried, but they I came out.
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Bibliographic details
Sun (Auckland), Volume III, Issue 714, 13 July 1929, Page 10
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178FISH PUZZLE Sun (Auckland), Volume III, Issue 714, 13 July 1929, Page 10
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