File:Aquatic life (1918-1919) (19721047246).jpg

Title: Aquatic life
Identifier: aquaticlife419181919baus (find matches)
Year: 1918-1919 (1910s)
Authors: Bausman, Joseph E
Subjects: Aquariums; Fish culture
Publisher: Philadelphia : J. E. Bausman
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

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104 Aquatic ILitt ously on Daphnia and mosquito larvae, and materially deplete the supply if per- mitted to remain. Most enemies can be sifted out under water through a tea strainer or flour sieve. A consideration is usually overlooked that is probably worth thought. That is, the water in which the Daphnia are kept. The common practice is to place them in clean, fresh water. This would seem to be crystal clear, and many young Daphnia will be observed. Cypris or "hard-shell daphnia" are not quite such good food, but make an accept- able second choice. They are extremely hardy, and may be bred in large numbers by supplying them with decaying leaves, etc. They will stand heat and extreme crowding. Mosquito larvae, on the other hand, I
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Scrimshaw Working a Florida Pond be a mistake unless they are intended for immediate use. The water of the ponds in which they occur naturally is well charged with the food they require. To rob them of this entirely is to weaken them and shorten their lives. It is better to use the same water, but dilute it. If green aquarium water can be had it is better than clear water, the microscopic vegetal organisms being perfectly good for Daphnia. This can be well demon- strated by removing fishes from a green- water aquarium and introducing a supply of Daphnia. In a few days the water will should not be allowed to feed. In clear water their development is retarded, par- ticularly if kept cool. However, when they have developed to a good size it is impossible to prevent their turning into fully developed mosquitoes. A good plan to prevent the escape of mature indi- viduals is to keep the larval stock in a large bottle, partially filled with water, inverting it to pour out larvae desired for feeding. After the bottle is emptied, the hatched mosquitoes may be drowned by filling the bottle with water, pouring it through mosquito netting fastened over the mouth.

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