White Spots

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. ...