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 Library > Diseases and Medications > Internal Problems > Nematode (Roundworm) Infections in Fish |
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Nematode (Roundworm) Infections in Fish | |
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Page 5 of 11 | Pages: 1 . 2 . 3 . 4 . 5 . 6 . 7 . 8 . 9 . 10 . 11 | |
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General Notes Diagnosis Intestinal nematode infections should be suspected if fish eat well but are thin ("wasted"), if brood stock production declines over time, or if juveniles grow more slowly than expected or are stunted (unusually small). Infections by nematodes in the skin or muscle may be visible or be suspected if lumps or grub-like growths are seen. As described in the section Disease in Fish, fish infected with Eustrongylides species often have grossly distended abdomens, but appear and behave as normal. Nematodes may also infect other tissues and organs in the body resulting in symptoms related to the organ system affected and the degree of damage. Since other diseases can create the conditions described above, positive identification of infection by nematodes is important. This identification can be made by complete necropsy of a representative sample of the affected population or by biopsy of external lesions. An alternative to necropsy for identification of intestinal infections is collection of fresh fecal samples followed by microscopic evaluation for presence of nematode eggs, larvae, or adults. Feces to be examined must be absolutely fresh, since feces that have been in a tank for even just a few minutes may contain free-living nematodes that are not parasitic and are not a concern for fish health. These free-living nematodes are often difficult to distinguish from parasitic nematodes. If possible, multiple fecal samples from the same group of fish should be taken over time. This increases the likelihood of identifying early nematode life stages. Even though periodic checks of brood stock and juveniles can be made by examining fresh fecal matter for the presence of nematode eggs or larvae, the sacrifice and necropsy of a small representative group of fish is the most informative method. For pets or valuable individuals examination of fecal material may be the best option for diagnosis of infection. more ... |
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