File:Goldfish breeds and other aquarium fishes, their care and propagation - a guide to freshwater and marine aquaria, their fauna, flora and management. With 280 explanatory illustrations, printed with (14766424075).jpg

Identifier: goldfishbreedsot00wolf (find matches)
Title: Goldfish breeds and other aquarium fishes, their care and propagation : a guide to freshwater and marine aquaria, their fauna, flora and management. With 280 explanatory illustrations, printed with the text
Year: 1908 (1900s)
Authors: Wolf, Herman Theodore, 1855-
Subjects: Aquariums Goldfish
Publisher: Philadelphia : Innes & sons
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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ater.The larvae require aerated water and will not survive in any numbersin stagnant or Stillwater ponds and ditches. They are active and carnivorous,feeding upon the young May-flies, soft-bodied Dipterous larvae and uponvegetal matter. They have large flat heads, compound eyes and a flat body,which enables them to crawl under stones in the water. Usually theyhave long antennae and breathe by tracheal gills. The full-grown nymphis active and varies with different species from y2 to 1Y/2 inches in length,their cast skins being common objects along the banks of streams. Themost generally distributed species are Leuctra tenella^ Fig. 213, Pteronaraysproteus, Acroneuria abnormis, Isogenus frontalis and Per/a ephyre. Thereare no records of their being injurious to young fishes, and larvae form oneof the principal natural foods of the young trout, dace and other cold-water fishes. 260 AQUATIC INSECTS OF FRESHWATER FIG. 214. Lar\ a of aDragon-fly, GompAusexi/is, with protrudedmask. Enlarged.
Text Appearing After Image:
Dragon-Flies belong to the order of Odonata, signifying a tooth.More than 2000 species have been established, of which about 300 inhabitthe United States. They are very slender insects having four elongatedmembranous wings, finelynetted with veins, each witha jointed structure or nodusnear the middle of thefront margin. The head islarge and may be rotatedon the slender neck, and thelarge eves are placed at thesides of the head. The an-tennae are short and slender,the mouth parts developedfor biting and the legs placednear the front of the thoraxand fitted more for grasp-ing their prev and adheringto leaves and twigs than forwalking. They are dav D J • FIG. 215. Nymph of a Dragon-fly, fivers, the prey being Cap- Anax Junius, with mask folded, not visible. . . , . from above. Enlarged. tured by the legs and man- dables in their darting flights. It consists of flies, mosquitoes, midges,gnats and other small insects. All the species are aquatic. The eggs arelaid in the water, on the ste

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