. Goldfish breeds and other aquarium fishes, their care and propagation; a guide to freshwater and marine aquaria, their fauna, flora and management. Aquariums; Goldfish. AILMENTS AND DISEASES in breathing and the sloughing away of the skin. The following are the recognized most common freshwater species likely to be encountered by the aquariist. IcHTHYOPHTHiRius MULTiFiLiis. This infusotian, Figs. 105 and 106, first forms round milky spots on the skin, fins, eyes and gills of freshwater fishes. A microscope examination will reveal that each spot is caused by. FIG. 105. Ichthyophth'irius multi
. Goldfish breeds and other aquarium fishes, their care and propagation; a guide to freshwater and marine aquaria, their fauna, flora and management. Aquariums; Goldfish. AILMENTS AND DISEASES in breathing and the sloughing away of the skin. The following are the recognized most common freshwater species likely to be encountered by the aquariist. IcHTHYOPHTHiRius MULTiFiLiis. This infusotian, Figs. 105 and 106, first forms round milky spots on the skin, fins, eyes and gills of freshwater fishes. A microscope examination will reveal that each spot is caused by. FIG. 105. Ichthyophth'irius multifilvs, an Infusorian parasite. Greatly enUrged. 1. Ciliated spore, 2. Segmentation upon encystment. 3. Adult infusorian. Head of a Catfish affected with Ichthyophthirius multifiliit. the presence of a ciliated infusorian, the epidermis of the fish forming a considerable protuberance over the parasite. Sometimes two or three infusoria inhabit the same cyst, the form of the younger differing from that of the grown individuals. The fishes soon appear completely ema- ciated, the skin becomes thickened where the parasite is encysted, a scum forms on the surface and deaths occur in ten days to two weeks. Pantotrichum '^VLA. {U. lagenula.) This infusorian. Fig. 107, is parasitic on the skin and in the gills of freshwater fishes and produces the "Spot-disease" or "Pox," by living in the pulp cavity of the scales and absorbing their con- tents, pigment cells, etc., producing colorless patches on the skin. These spots first appear as slimy excrescences, later assume a funguslike appearance, and finally cause the death of the fish by emaciation and destruction of the tissues. The infusorian has an oval body with a sucking disc and swimming appen- dage, and the cuticle is covered with very fine evenly-developed cilia. Trachelocercid^. Of these infusoria the most frequently occur- ring freshwater species, is the ciliate Holotricha,i/.wjyj/flcctf,Fig. io8,a more or
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectaquariu, bookyear1908
