. Goldfish breeds and other aquarium fishes, their care and propagation; a guide to freshwater and marine aquaria, their fauna, flora and management. Aquariums; Goldfish. FIG. 96 Trichoditia pediculus a Hirudinld parasite. Greatly enlarged. its host; and produces tiny red external, gill and throat ulcers into which it is pitted like a cancer. When present in numbers it is a dangerous parasite and has been found on fishes afflicted with what is popularly known as Twitters. It has a nearly circular ciliated body and on its lower side a suctoral disc. Arachnia or Arachnid Parasites. This group in
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. Goldfish breeds and other aquarium fishes, their care and propagation; a guide to freshwater and marine aquaria, their fauna, flora and management. Aquariums; Goldfish. FIG. 96 Trichoditia pediculus a Hirudinld parasite. Greatly enlarged. its host; and produces tiny red external, gill and throat ulcers into which it is pitted like a cancer. When present in numbers it is a dangerous parasite and has been found on fishes afflicted with what is popularly known as Twitters. It has a nearly circular ciliated body and on its lower side a suctoral disc. Arachnia or Arachnid Parasites. This group includes the Mites, Ticks, etc., of which some of the aquatic species are discussed in the appendix to the Aquatic Insects. One family, Trachearia, contains strictly parasitic genera, and the Acharidie and Hydrachnida have parasitic and predatory members which subsist largely on the freshwater fauna. The common form is the red Water-mite, Hydrachna geographica. Fig. 97. With five other families of this group parasitism is but slight and on the higher Vertebrates. Crustacea or Crustacean Parasites. This group includes the so-called Fish Lice, small crustaceans known as Epizoa, and belonging to the families Lernieda, Caligidie and Argulida. Lern^d^ and Caligidie. The members of these families rarely occur as parasites on the freshwater fauna, having those of saltwater as hosts; but some are brought into freshwater by marine fishes in their. FIG. 97. Hydrachna geographica, an Arachnid parasite. Enlarged.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Wolf, Herman Theodore, 1855-. Philadelphia, Innes & Sons