The fish that lives in an anemone and nowhere else. It is a damselfish, and the relationship goes both ways: the anemone shelters the fish, and the fish drives off the butterflyfish that would otherwise eat the anemone.
The mucus is what stops the fish being stung, and it is acquired rather than born. A juvenile settles on an anemone and spends hours making brief contact before it can rest in the tentacles. A fish kept away from its anemone loses the protection again.
The group is a hierarchy of two. The largest fish in an anemone is female, the second is the breeding male, and the rest are smaller and do not breed. If the female dies the male changes sex and the largest juvenile moves up, so the arrangement repairs itself without anything arriving from outside.
Identification runs on the host as much as the fish. Several species are separated on the number and shape of the white bars and on which anemone they are in, and the entries say which host to expect. There are no anemonefish in the Atlantic at all, which is why a Caribbean anemone holds shrimps and juvenile fish instead.
Every one has a page. They are shown as a list rather than as pictures because nothing has been photographed or logged for them yet, and a species with nothing behind it should not sit in front of one that has.
How many of the 11 carry a record at each destination. A species usually carries several, so these do not add up to 11.
All 1316 species in one index, with filters for destination, rarity and hazard.
