Parasite

Toggle Myth / Reality Ichthyophthirius is present in every aquarium. This parasite is believed to be permanently present in the system and becomes active only when environmental conditions deteriorate. Stress, temperature drops, water changes, or conflicts between fish are thought to activate a parasite that had previously remained in a dormant state. It is widely accepted that Ichthyophthirius forms highly resistant cysts capable of persisting for long periods in substrate, filters, and decorations. Even after prolonged absence of clinical signs, the infection is assumed not to disappear but merely enter a latent phase. ...

Toggle Myth / Reality Myth Description: “Crypt”, “marine ich”, or “white spot disease” — Cryptocaryon irritans is a ciliated protozoan parasite, often visible to the naked eye. Tangs, butterflyfish, and boxfish are particularly susceptible and typically among the first to become infected. The free-swimming infectious stage — theront — most often attaches to gills and fins. That’s why these areas should always be examined first. Once mature, the parasite detaches from the host and encysts on the substrate. Around day 3, the tomont undergoes uneven cell division. Between days 6–9, dozens to hundreds of theronts hatch and actively swim away in search of new hosts. ...