Fish Anatomical Terms
Adipose fin, A fatty none erectile fin, between the dorsal and tail. Not present on all fish.|
Anal fin, Situated to the rear of the fish on the underside.
Barbel, A sensory organ used to taste things and to feel things, some Corydoras Catfish use them in their courtship.
Bifid spines, Small erectile spines found on some fish, beneath the eyes of some Loaches or on the Caudal Peduncle in Surgeons and Tangs.
Gonopodium, A modified Anal fin used by male livebearers for copulation.
Lamella, Gill filaments.
Mandible, The lower jaw.
Nuchal hump, A large lump on the heads of some mature Cichlids.
Operculum, Gill cover.
A: I + 15 (14 - 16).
A signifies the anal fin, I = one stiff ray, 15 = the usual number of soft rays and (14 -16) means that the number of soft rays can vary between those numbers.
Many of the terms used when referring to fish can be confusing at first but knowing them and being familiar with them can help when asking a question, for example if a fish has damaged it's gills in some way it would help to answer the question if the responder knew where the damage was precisely. The Operculum is the gill cover and could be damaged by a trauma of some sort. The Lamella are the gill filaments and could be damaged by ammonia, protozoa and so on. So by being a little more specific is far more helpful than simply saying "damaged gills" and it is likely to to receive more and better help as a result.