Identifier: annualreportof1189495newy (find matches)
Title: Annual report of the Commissioners of Fisheries, Game and Forests of the State of New York
Year: 1895 (1890s)
Authors: New York (State). Commissioners of Fisheries, Game and Forests
Subjects: Forests and forestry Fisheries Game and game-birds
Publisher: (Albany, N.Y. : The Commission)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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scendants of a single femaleDaphnia would in sixty days amount to 1,291,370,075 individuals. That is astounding enough and I am not yet ready to accept it, but Mr. makes a female Daphnia do about four-fifths as much in twenty-four hours. We have studied Daphnia some at this station, kept them in aquaria and undersuch restraint as enabled us to follow their reproduction. The eggs are large, thebrood cavity could not hold a hundred of them at once, I should say that less thanfifty would be the average. In the summer they hatch in the brood cavity andcome out alive and kicking. It takes three or four days for eggs to mature andcome forth, and about a week for the young to come to maturity so as to reproduce.Of course, I recognize the possibility of European Daphnia being more prolificthan ours. At Woods Holl there was an abundance of two species of Daphnia, one of them,I think, Daphnia pulex, the other a very large one, say one-fifth or one-quarter ofan inch long, the largest I ever saw.
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Fig. 12. Daphnia bearing- eggs. Mr. Atkins sent me specimens of two species of Daphnia, and one individualbearing eggs was enlarged in a drawing for this paper, in the office of the StateEntomologist, and is shown in Fig. 12. About forty eggs can be counted in thissingle specimen, which it will be noticedis of a different species from that shownin Fig. 11. While preparing this paper I was suddenly confronted by a dilemma which was forthe moment most embarrassing. The drawings and plates of the figure had beenmade of the Daphnia, and my notes commending the crustacean as fish food werepractically ready for the printer when incidentally Dr. Tarleton H. Bean, Director ofthe New York Aquarium, informed me that in translating from the French a FISHERIES, GAME AND FORESTS. I I 3 lecture by Dr. Jousset de Bellesme, Director of Fish Culture of Paris, he found thatthe lecturer placed little value upon Daphnia as fish food. I was furnished with acopy of the translation and found that it said: I

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