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Koi Diseases

Gill Flukes





Gill Flukes

Type: Parasitic


>>caused by gill flukes, Dactylogyrus, small trematodes or worm-like parasites that grow up to 2 mm in length

>> Dactylogyrus is monogean, i.e., it needs only one host to complete its entire life cycle

>> dactylogyrids, which are egg-layers, have a scalloped head and visible eyespots

>> flukes anchor themselves to the koi using hooks at one end of their body

>> another commonly encountered fluke in koi is the gyrodactylus, which differs from the dactylogyrus by having a V-shaped head, no eyespots, and giving live birth




>> presence of gill flukes on the gills and body

>> labored breathing

>> swimming in jerky motions

>> gill hyperplasia and increased mucus

>> long periods of rest at the bottom of the pond with clamped fins

>> reddening of some focal areas

>> can create entry points for secondary bacterial infections, which in turn can lead to gill diseases and ulcers



>> a skin scrape or biopsy is needed to make a definite diagnosis of gill flukes

>> gill flukes are more difficult to treat than skin flukes

>> regular salt baths, as well as special, high-dose treatments with malachite green and formalin may produce results

>> organophosphates such as masoten may be required for severe cases





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