These are a type of Isopod that is rarely found in marine aquaria. They are considered a parasite, but probably a better name for them are predators that are simply too small to actually consume their prey entirely.
Only real way to remove them from a reef tank is by removing the fish they are attached to, then extracting it from the fish using tweezers. Care must be taken to ensure that undue damage is not cause to the fish. The wound can be treated with iodine, then the fish returned to the tank.
Attached to a Synchiropus splendidus
Attached to the gill of a Nemateleotris decora
After removal from a N. decora
- Cirolanid Isopod Capture Techniques, Feeding Habits and Mortality Testing by Brian Planks - Reefkeeping Magazine
- Pills, Parasites, and Predators; Isopods in the Reef Aquarium by Ronald Shimek - Reefkeeping Magazine
- Isopod FAQs - WetWebMedia
- Cirolanid Isopods by Keith Clarke and Ronald Shimek - Reefs.org
- Parasitic isopods in Purple Firefish (Nematoleatris decora)