. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. icult. The majority of the valuable organisms are rotifers. These movein a steady, revolving or rotating manner. On page 57 will be foundinstructions for propagating these organisms for purposes of feedingyoung fish. Most rotifers can be readily identified as such because they TROPICAL AQUARIUM FISHES 141 swim through the water by means of circlets of hairs or cilia arisingfrom the front of their heads, by the vibratile action of which theyswim and disport themselves through the water. In fact,
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. icult. The majority of the valuable organisms are rotifers. These movein a steady, revolving or rotating manner. On page 57 will be foundinstructions for propagating these organisms for purposes of feedingyoung fish. Most rotifers can be readily identified as such because they TROPICAL AQUARIUM FISHES 141 swim through the water by means of circlets of hairs or cilia arisingfrom the front of their heads, by the vibratile action of which theyswim and disport themselves through the water. In fact, rotifers derivetheir name from the wheel-like appearance produced by the motion ofthe circlets of cilia while feeding and swimming. For culture water tohave practical food value a single drop should contain at least half adozen living objects that can be seen in the manner suggested. Waterrich in life will show rotifers so thickly that they almost touch oneanother—probably two hundred in a small drop. In taking water fromthe culture tank to feed the fish it should be skimmed from the surface,. Fig. 96. Common Forms of Microscopic Amm.\l Life in Freshwater(Greatly magnified) 1. LoxoDES, a very common form. 2. Ceratium, a very common form, especially in ponds and lakes. 3. PARAMAECIUM, a very common form, the slipper animalcule. 4. BuRSARiA, a very common form, one of the largest. 5. Stylonvcha, a very common form, found everywhere. 6. Phacus, not so common as the above numbers. 7. Spirostomum, common everywhere. 8. Euglena, common everywhere. 9. Chilodon, common everywhere. 10. Trachelocerca, common everywhere, the swan animalcule. 11. EupoLOTEs, not an aquarium in America without examples. 12. DiDiNiUM, predacous, feeds on paramaecium and others. 13. Trachelocerca, small but plentiful. 14. CoLEPs, the barrel animalcule, common. 142 GOLDFISH VARIETIES A:ND or the animals extracted from the water by a plankton net, which isnothing more than a small net of the finest bolting cl
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