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Grouper is a fish that lives in coral reefs, which is the internationally known as groupers or coral reef  fishes. These  fish  have  high  economic  value  and  potential  to  be  developed  in  Indonesia. Grouper traded alive, the price  is relatively high. The price of grouper at the  level fishermen  to reach US$ 20 (Rp 200,000,  -)  for  each  kilogram.These  fish  are  exported  mainly  to  Hong  Kong  with  high  price. Development  of  grouper  aquaculture  in  floating  net  a  viable  alternative  to  overcome  the  increasing production of marine  fisheries. The problem  that often  inhibiting  fish culture  is  the diseases emergence, among others, caused by  the parasites. The emergence of  the disease  is  the result of  interaction between environmental conditions that dont support the cultivation of their life inside, fish (host) that are sensitive and  the presence of parasites. Uncontrolled environmental conditions  there  for  the  fish become  stressed with poor immune systems, and facilitate pathogenic substance attacked hosts. This study aimed to the identify ectoparasites that attacked the grouper (Cromileptes altivelis) in floating  net  cages  and  to  determine  the  prevalence  rate  of  ectoparasites  that  attacked  the  grouper (Cromileptes altivelis) in floating net cages.  The method of this study was descriptive method. Samples were taken with body length between 15-20  cm  and  four months  old  from  the  floating  net. The main  parameters  observed  in  this  study was identification of ectoparasites  that attacked  the grouper  (Cromileptes altivelis)  in  floating net cages and prevalence rates for each of ectoparasites. While the supporting parameters were that water quality value in floating net cages as follow temperature, pH and salinity were measured during sampling activities.  The results showed  that of 60 samples were  taken from  four plots of  floating net cages, 21 fish infected with  ectoparasites  positive. 17  positive  fishes  infected Pseudorhabdosynochus  sp.,  one  sample positive  infected  Benedenia  sp. 3samples  positive  infected  fish  Neobenedenia  sp.  The  ectoparasites prevalence of from cages 1, 2, 3 and 4 of 26.66%, 33.33% , 53.33% and 26.66%  The  suggestion  of  this  study  is  cleanness  improvement  of  floating  net  cage  management  to reduce ectoparasites infectation.

jurnal ilmiah perikanan dan kelautan/jurnal ilmiah perikanan dan kelautan

Identifikasi dan Prevalensi Ektoparasit pada Ikan Kerapu Tikus (Cromileptes altivelis) di Karamba Jaring Apung Unit Pengelola Budidaya Laut Situbondo &lt;br&gt;&lt;i&gt;[ Identification And Prevalence Of Ectoparasites In Grouper (Cromileptes altivelis) At Floating Net Cage Of Marineculture Management Unit Situbondo]&lt;i&gt;