. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Aquariums; Goldfish. 134 GOLDFISH VABIETIES AND Cypris. Incorrectly known as "hardshell daphnia," Cypris forms an important article of fish diet. These Crustacea inhabit stagnant pools, particularly those well stocked with decomposing vegetal matter. Al- though capable of swimming freely they are more apt to remain close to the bottom, but more especially to decaying wood. They are of a dull, purplish black color about twice the size of an ordinary pin-head. Inex- perienced observers
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Aquariums; Goldfish. 134 GOLDFISH VABIETIES AND Cypris. Incorrectly known as "hardshell daphnia," Cypris forms an important article of fish diet. These Crustacea inhabit stagnant pools, particularly those well stocked with decomposing vegetal matter. Al- though capable of swimming freely they are more apt to remain close to the bottom, but more especially to decaying wood. They are of a dull, purplish black color about twice the size of an ordinary pin-head. Inex- perienced observers frequently mistake them for Daphnia. Fishes do not a,ppear to be quite so fond of them as of Daphnia but they are a good second choice. They are extremely hardy and will withstand dense overcrowding in the foulest of water. Under favorable conditions Cypris multiplies with astounding rapidity. They have been known to attack newly hatched fishes. Blood Worms. In freshwater pools nearly everywhere can be found deep-red, jointed worms about half an inch long. See figure 89. They usually stay at the bottom, living chiefly on decomposing vegetal matter. Often they will writhe their way awkwardly through the water in Fig. 89. Bloodworm {Larva of Chirononnis) {Enlarged four times) a series of figure eights. They are the larvje of midges and form an important article of diet for our native fishes. They are often found in large numbers in daphnia pools and should always be taken when possible. If too large for the young fish, they make choice morsels for the older ones. Tubifex Worms. These are small thread-like worms living in mud and sand. They form a tube or case below the surface, extending the upper ends of their bodies from this in search of small organic food, causing a circulation of water about themselves by a constant weaving. Fig. 90. Tubifex Worms Magnified and as the Ends'Appear Above the Bottom motion. When alarmed they draw back into the case. They are exten- sively culti
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