Mature worms which come away from the host fish, give rise to up to a hundred or more ciliated young, which then actively search out a new host fish. The development of the young takes some 5 days in the off host stage at around 24 ° C. The young take around 6 days to reach maturity before leaving the host fish to replicate the cycle over again. This if the cycle is not broken, very heavy infestations can build up, with ensuing mortality.
Marine flatworm. Typically infested are tang, especially yellow, also angels. Imperators and majestics are often seen with this parasite, noticeable by "fading" of their color.
Dirty conditions in tank seem to assist parasite in reproducing itself, so improved cleanliness is a must. Can be cured by diligent application of treatment.
Vital to keep bottom of Aquarium free of detritius, as the young develop from the mature adults in this ideal medium, & siphoning out this waste matter, can help to eradicate the problem.
Dr Prescott, Shawn
Fish Disease Dolau Ltd