Papurau Newydd Cymru

Chwiliwch 15 miliwn o erthyglau papurau newydd Cymru

Cuddio Rhestr Erthyglau

49 erthygl ar y dudalen hon

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IIMBECILE FATALLY BURNT

REMOVAL OF ANOTHER LONDON…

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News from the Mines.

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l, WHAT FISH FEED ON

Newyddion
Dyfynnu
Rhannu

WHAT FISH FEED ON OCEAN MYSTERIES REVEALED I The log of the steam-trawler Huxley, which dredged the North Sea and the English Channel for fish lore, has just been pub- lished as a Blue-book. The principal work has been the investiga- tion of the life histories of the food fishes in British waters. Thig history has hitherto been most ob-aeurg, but the log of the Huxley does much to illuminate the mysteries of the life on the sea-floor. Plaice with labels attached were liberated on the Dogger and elsewhere, and.the recap- tures of marked flili recorded. As tho result of the examination of the stomach contents of a large number of the captures it was found that some fish I specialise in food much more tJhaJl others. I What Fish Feed on Plia.ice feed chiefly on shellfish. Haddock are in discriminate feeders, relying chiefly on aheelfis/h. Turbot are cannibalistic. On some feeding grounds there is no doubt severe competition betwoon plaice, dabs, and had- dock in the struggle for life. Plaice being one of the most important food fish-ee, much att-entionowa6 given to its migrations, and the question of its deerease through overtrawling. In the first year 1,463 plaice were marked and set .free in different parts of the North 80a.. Nineteen per cent. were subsequently re-captured. It is, therefore, clear that the total annuail catch of the fishermen no 'longer forms an insignificant proportion of tihe total stock of this species. On the Dager I Only mature fish. are found on the Dogger, j proving that plaice do not breed there. Over 1,100 small marked fish were taken from inshore grounds and liberated on the Dogger, and 90 per cent, of the recaptures were reported by E-nglish fishermen. The fish had increased in weight greatly by the following winter. It is suggested that it would be a prentable commercial transac- tion to liberat-e immature fish on the Dogger, as dt is prove 90 per cent. of the profits of the transaction would fall to English fisher- men. It has been proved possible to ascertain the age of fishes by an examination of the otoliths, or ear-stones, the stolliee growing by the accretion of a white ring formed in early summer and a dark in autumn.

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