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Koi  (Cyprinus  carpio)  is  one  of  the most  famous  freshwater  ornamental  fish  which  offers financial advantage. There are a  lot of factors which have  to be face when we are  trying  to cultivate or culture Koi, one of those factors is the disease. Parasite which always in freshwater fishes is Ichthyophthirius multifiliis. I. multifiliis penetrated  through  skin  causing  destruction  ephitelium  cells  by  cilia  and  by  consequent  causing  a histopathological changing. The objectives of this research was to determine alteration of Koi (Cyprinus carpio) skin histopathology which  infested by I. multifiliis  through cohabotation. Cohabitation was done during 4 days with mixing 7 fishes infected with white spot disease to 100 healthy  fishes. Koi  that had been  infested observing of pathology changes. And than slicing the skin organ to prepare histopatology slide from 3 sample in every level infestation. To detect the level infestation, parasite was divide into 3 level respectivelly are low level (1-5 parasite/slide), the medium level (6-10 parasites/slide)  and  the heavy  level  (more  than 11 parasites/slide). Furthermore, damage  level determination by histopatology was decided by scoring. Data analyzed with descriptive based on clinical simptom, and than, the skin histopatology which had been attacked was done by scoring. The results would be analyzed statistical with Kruskal Wallis  test.  If  it  is  show  the  significant defference,  the  test would be continued with Z  test 5%  (Siegel, 1986). The research showed  that  the fish skin Koi  infestation by I. multifiliis  there was histopatology changed shaped  respectivelly  epidermis  proliferation,  infiltration  of  inflammation  cell  and  ephithel  erosion.  Based  on histopatological changed skoring caused by I. multifiliis infestation from various infestation grade, there were 62.2% of Koi fish skin was epidermis proliferasi, 73.3% of one was infiltration of inflammation cell and 28.9% ephithel erosion.  Water  quality  measurement  showed  that  temperature  and  acidity  in  normal  condition,  respectively o temperature between 24–26 C dan pH 8.

jurnal ilmiah perikanan dan kelautan/jurnal ilmiah perikanan dan kelautan

Perubahan Histopatologi Kulit Ikan Koi (Cyprinus carpio) yang Terinfestasi Ichthyophthirius multifiliis Secara Kohabitasi &lt;br&gt;&lt;i&gt;[Skin Histopathology Alteration of Koi (Cyprinus carpio) With Ichthyophthirius multifiliis Infested Accordance Cohabitation]&lt;i&gt;