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 ?
2007), quienes reportaron la presencia de Dawestrema cycloancistrium, Trichodina fariai e Ichthyophthirius multifiliis en alevinos.
Ichthyophthirius multifiliis and Cryptocaryon irritans (Phylum Ciliophora), In: Woo, P.
Partial cross protection against Ichthyophthirius multifiliis in Gyrodactylus derjavini immunized rainbow trout.
The common protozoan parasites of freshwater fishes are Ichthyophthirius multifiliis Chilodenella sp Trichodina sp.
1] pode diminuir a infestação de Ichthyophthirius multifiliis em Rhamdia quelen, espécie estenoalina, e reduzir a mortalidade por diminuir o gradiente iônico entre o plasma animal e a água (Garcia et al.
PHLOXINE B IS A POTENTIAL PROPHYLACTIC TREATMENT AGAINST CHANNEL CATFISH PRE-INFESTED WITH ICHTHYOPHTHIRIUS MULTIFILIIS.
Ichthyophthirius multifiliis quickly succumbs even to minuscule doses--as small as 1 part per million.
Three monogenean species (Gyrodactylus turnbulli Harris 1986;, Gyrodactylus VonNordmann, Dactylogyrus extensus Mueller and Van Cleave 1932); six protozoans (Trichodina Ehrenberg 1831, Chilodonella Stand, 1928, Ichthyophthirius multifiliis Fouquet, 1876, Piscinoodinium pillulare Schaperclaus 1954, Tetrahymena sp.
cyprinoides were collected 154,740 parasites from five taxa, being two Protozoa species, the Ichthyophthirius multifiliis (Ciliophora) and Spironucleus sp.
To test the relationships within the genus Euplotes, the two ophryoglenid species Ichthyophthirius multifiliis U17354 (Wright and Lynn, 1995) and Ophryoglena cantenula U17355 (Wright and Lynn, 1995) were chosen as outgroup species.