. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. hes. They may be caught in the open reaches of the fresh tidal portion ofthe Delaware as well as its upland tributaries. Silverfins have been kept in aquaria for several years, but care shouldbe exercised to cover with a screen to prevent their leaping out. The Darter The darters have no swimming bladders and are therefore consider-ably heavier than water. They move along the bottom in jerky motionssomewhat like hopping. When in reach of their prey they make a shortleap. Although this seems to
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. hes. They may be caught in the open reaches of the fresh tidal portion ofthe Delaware as well as its upland tributaries. Silverfins have been kept in aquaria for several years, but care shouldbe exercised to cover with a screen to prevent their leaping out. The Darter The darters have no swimming bladders and are therefore consider-ably heavier than water. They move along the bottom in jerky motionssomewhat like hopping. When in reach of their prey they make a shortleap. Although this seems to be short of the object they always succeedin getting what they go after. One would imagine them to have a longtongue like a frog, moving with invisible rapidity. There is somethingquaint and droll about the darters. The majority of them cannot standwarm water. 76 GOLDFISH VARIETIES AND The Rainbow Darter Esteoma coerulea is probably the most bril-liantly colored of our native fishes, being barred with red, blue, orange andgreen in most striking fashion. On account of its brilliant coloring it is. Fig. 58. The Darter (Enlarged nearly twice) known as the Soldier Fish. It occurs in shallow streams of the MiddleWest. Extremely fond of daphnia or very small worms, but may be-come educated to taking shreds of raw meat. They can be kept success-fully and are well worth the trouble. THE KILLIFISH Killifish, both fresh and saltwater forms are among the most hardyof the smaller fishes. Used largely as bait-fish on account of theirtenacity of life, they exhibit the same quality in the aquarium, standing
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