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 is ciliated parasite in the multifiliis species has significant importance and accounted as dangerous external fish's parasite.
Ich" is short for Ichthyophthirius multifiliis, a protozoan parasite that at maturity appears as white spots on infected fish--the scourge of anyone who has owned an aquarium.
2004) and has also been effective at killing the protozoan Ichthyophthirius multifillis of ornamental fish when administered orally in food (Schmahl et al.
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.
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.
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.