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The Water Fleas ( Cladocera ) are the second suborder next to the Leaf-legged. Early in the morning, but also on warm, quiet evenings, and moreover in cloudy skies, these little creatures, the largest of which are seldom longer than 6 mM, swim close to the surface of the water; but they go down to the depths as soon as the sun begins to shine on the water with some force. Some species, by the way, always prefer to stay close to the muddy soil than in higher water layers. It is not surprising that they have long attracted the attention of naturalists, as they usually populate still and slowly flowing water in great crowds. The Cladoceren and Copepods make, according to Leijdig, almost the only food from the most estimated Visschen der Bavarian mountain lakes and from Lake Constance, from the Roode Trout ( Salmo salvellinus ) and Blauwe Houtingen ( Coregonus Wartmanni ), whose catch is a means of subsistence for a large number of inhabitants of the lake districts.


[As translated from the Dutch by online translator ]

Author

Project Gutenberg's Leven der Dieren, Deel 3, Hoofdstuk 5, by A. E. Brehm

Posted on

Sunday 14 June 2020

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767*867

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