Ichthyophthirius


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Ichthyophthirius

 

a genus of protozoa of the order Holotricha comprising the one species {Ichthyophthirius multifil-iis). It parasitizes fish that live in fresh and slightly saline waters, under the epithelium of the skin and gills, under the cornea of the eye, and often the fins; it produces whitish swellings of the skin—pustules. At 28°C the growth of Ichthyophthirius in the fish lasts about one day and at 20°C, seven days. Mature infusori-ans (up to 1 mm in size)—trophonts—emerge from the pustules into the water and, upon falling to the bottom of the water, become encysted. In the cyst, division occurs eight to 12 times and 500 to 1,000 (sometimes up to 2, 000) tiny forms (20–microns in diameter) develop, which are covered with cilia. Known as tomites, these forms emerge from the cyst into thewater and infect other fish. Ichthyophthirius often cause massdestruction of fish, particularly of fry. Their control is effectedwith chemical agents.

References in periodicals archive ?
Ichthyophthirius multifiliis is a highly studied species especially with regard to its life cycle, epidemiological aspects, elements involved in the greater susceptibility of some fish species and in effectiveness of treatments and prevention.
Ichthyophthirius multifiliis is one of the biggest responsible for significant economic losses in fish farms worldwide (28).
After 15 days, ten 1g rainbow trout which were suffered from ichthyophthirius released to these pools and after one month, to wit day 45 of research, fishes exited from pools.
La llegada de la trucha y del pejerrey de rio habria traido consigo la introduccion del parasito Ichthyophthirius multifilis, que habria ocasionado varios eventos epidemicos entre los peces nativos del Titicaca, llegando a causar la muerte de unos 18 millones de Orestias en 1981 (Wurtsbaugh & Alfaro 1988).
For example, transgenic Tetrahymena expressing Ichthyophthirius multifiliis i-antigen protein on their surface are effective vehicles for vaccination of freshwater fish against infection by I.
Effects of a medicated food containing malachite green on Ichthyophthirius multifiliis Fouquet 1876 (Hymenostomatida, Ciliophora) in an ornamental fish.
Ichthyophthirius multifilis and Tetrahymena thermophila tolerate glyphosate but not a commercial herbicidal formulation.
Initial medicinal bath experiments suggested that the photoactive dye phloxine b could be used to treat protozoa infestations including Tetrahymena and Ichthyophthirius without harm to the treated fish.
Parasitosis en Colossoma macropomum (Pisces: Characidae) Cultivado, ocasionada por los Protozoos Ichthyophthirius multifilis (Fouquet) y Piscinoodinium pillulare (Schaperclaus).
2007) reportaron la presencia de parasitos externos como Dawestrema cycloancistrium, Trichodina fariai e Ichthyophthirius multifilis en alevinos de paiche, en tanto que Cotrina y Rebaza (2008) reportaron Trichodina sp, D.