Ocean research and the great fisheries . Dorsal f/n. [Drnirn by Dr. James Johnstone Fig 2.—baby PLAICE. A. Embryo plaice, five days old, 2 mm. diameter B. Embryo x^laice ready to hatch, 2 mm. diameter. C. Larval plaice just hatched, 7 mm. long. D. Larval plaice beginning to flatten out and beginning to feed greetlily, 15 mm. long. ^7N C 2 /QO o CbTr^ 36 LIFE-HISTOB\^ OF THE PLAICE unconscious wrigglings, must attract very much more notice tothemselves than the floating eggs. Fortunately in temperatewaters hke the North Sea this period of extreme danger isbelieved to last for about one week onl
Ocean research and the great fisheries . Dorsal f/n. [Drnirn by Dr. James Johnstone Fig 2.—baby PLAICE. A. Embryo plaice, five days old, 2 mm. diameter B. Embryo x^laice ready to hatch, 2 mm. diameter. C. Larval plaice just hatched, 7 mm. long. D. Larval plaice beginning to flatten out and beginning to feed greetlily, 15 mm. long. ^7N C 2 /QO o CbTr^ 36 LIFE-HISTOB\^ OF THE PLAICE unconscious wrigglings, must attract very much more notice tothemselves than the floating eggs. Fortunately in temperatewaters hke the North Sea this period of extreme danger isbelieved to last for about one week only. Post-Larval PeriodBefore the food in the yolk-sac is all consumed, about the fourth day, the larvae begin to feed them-selves ; they must from this time on be more or less capableof steering a course and breasting a current. Their foodconsists of diatoms, the larvae of molluscs, &c. About thetwelfth day the j^olk-sac is completely absorbed and the post-larval stage is completed. It lasts about one week. Thisperiod
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisheroxfor, bookyear1921
