. Goldfisch Rassen und andere Aquarienfische, ihre Pflege und Vermehrung; ein Leitfaden für Süß- und Meerwasseraquarien, ihre Fauna, Flora und Management. Aquarien; Goldfische. Unpäßlichkeiten und Krankheiten Abb. 90. Cucullartus Nematod eleganSy ein Parasit. Länge der weiblichen 15 mm., männlich 8 mm. Fische. Diese sind Cucullanus foveolatus der Sunfish und C. elegans der Zander und der cyprinidae, Abb. 90. FiLARiD/E. Diese Parasiten sind häufiger auf die marine Tierwelt. Filaria â piscius gefunden wird spiralförmig in die Gewebe des Hering, Kabeljau und Wittling aufgewickelt. Eine Anzahl von anderen Arten dieser Familie treten 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. AILMENTS AND DISEASES FIG. 90. Cucullartus eleganSy a Nematod parasite. Length of female 15 mm., male 8 mm. fishes. These are Cucullanus foveolatus of the sunfish, and C. elegans of the perch and the Cyprinidae, Fig. 90. FiLARiD/E. These parasites are more common to the marine fauna. Filaria â piscius is found spirally coiled within the tissues of the herring, cod and whiting. A number of other species of this family occur in similar hosts and in warm-blooded animals. GoRDiiD^. These parasites take up a free existence in damp earth and penetrate the bodies of insects and their larvae. Some gain access to fishes by this means, where they become encysted in the tissues. Anguillulid^. These minute free intestinal thread- worms usually have the higher Vertebrates as hosts, but some species are parasitic in aquatic molluscs and in insect larvae. They are very widely distributed; the so-called Vinegar-eel, Anguillus aceti, belongs to this order. All the other families of this group are parasites of higher Vertebrates. AcANTHOCEPHALA OR Thorn-headed Worms. This group con- sists of members having vermiform bodies and otherwise resemble the Nematoda, but differ in having spine-covered heads by which they attach themselves to their hosts. They are now included in the single family Echinorhynchidae, which infests all classes of Vertebrates and are one of the more frequent parasites of fishes and amphibia. Over 100 species have been described, a considerable number in the Cyprinidae; and of these Echinorhynchus proteus is the most abundant species, of which the immature form inhabits the smaller crustaceans, especially Gammarus and Asellus, to be transferred with them to freshwater fishes. Other. FIG. 91. Echinorhynchus pro- teut, an Acanthoce- phalous parasite. Intermediate and Adult forms. Greatly enlarged.

Stockbilder mithilfe von Tags suchen

• bookcentury1900
• bookdecade1900
• booksubjectaquariu
• bookyear1908