Study on effect of external parasites infection in goldfish (Carassius auratus) in ornamental fish shop. Maha sarakham province, mueang district Do the survey at goldfish in Muang District of Maha sarakham province, 2 fish each store randomly shop 10 to 120 from a total of shop to check an external goldfish parasite was found to be infected with the parasite. Number 102 85 percent, which is a type of external parasites that are found are clear Mono group cucumber China the Dactylogyrus sp Gyrodactylus sp., as well. and external parasite experiment found. 1 crustacean species group is a tick (bloodsucking insect), fish (Argulus sp.)
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