This photo was taken on Bonaire, Dutch Caribbean. It shows a Bicolor damsel Stegastes partitus with a parasite on its eye. I guess it is an isopod. The isopod Anilocra partiti is known from this damselfish species, but it is supposed to attach under the eye. Also it should be coloured black to slate gray (Kensley & Schotte 1989).
Maybe this is a small male A. partiti isopod before sex, colour and host location changes. But it might as well be another species.
Does anybody know?
Article Guide to the Marine Isopod Crustaceans of the Caribbean
Dear Andreas
Interesting! That makes Trachelobdella lubrica (Grube, 1840) a likely candidate.
This leech is mentioned for the same host in Williams et al. (1994).They mention that juvenile isopods seem to attach at the same location, but an eyed sucker seems to be present indeed, so I vote for the leech.
Thanks very much for this input.
http://biology.uprm.edu/facultad/publications/Lucy_Bunkley_19940101_5.pdf
This parasite looks like a leech, Trachelobdella lubrica.
We have found this leech attaching around the eyes of this fish on the paper you mentioned above
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