| Diff. spec. |
| Parasite visible on skin, head embedded deep in the tissues of the host. Haemorrages and open wounds at site of infection. Serious weight loss, respiratory difficulties, sluggishness, red areas, ulcer, scale loss, fin damages, scraping, sometimes hanging vertically or belly up; length of parasite: 5 to 22 mm. |
| Baths of KMNO4 (25 ppm) or use of common salt solution of 0.8-1.1% (8000-11000 ppm) for 3 days. KMNO4 may be lethal to small fish at dosages required to kill Lernaea. Kabata (1970) reports that 20 ppm is used in China at 15 to 20 degrees centigrade, and 10 ppm at 21 to 30 degrees. Dose for 1.5 - 2 hrs. Dylox |
| 1) Provision of infection-free water. 2) Disinfection of fish transfered to a new holding locality and their quarantine on arrival. 3) Disinfection of ponds to be stocked with new fish. 4) Prevention of entry of carriers. |
| There are other species of Lernaea which may be involved. Adults are very hard to erradicate. Most treatments apart from KMNO4 rely on killing the free-living juveniles, thus breaking the life-cycle. |
| medium (10% - 30 %) |
|
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