Noun
anal fin (plural anal fins)
(ichthyology) A fin located on the underside of a fish behind the anus.
Adult females exhibit a small genital papilla in front of the anal fin origin. Source: Internet
Finlets are found between the last dorsal and/or anal fin and the caudal fin. Source: Internet
Most sparids are deep-bodied compressed fish with a small mouth separated by a broad space from the eye, a single dorsal fin with strong spines and soft rays, a short anal fin, long pointed pectoral fins and rather large firmly attached scales. Source: Internet
The anal fin has three spines, and usually 13 or 14 rays, the pelvic fins have 1 spine and 5 rays, and the pectoral fins are typically shorter than the head. Source: Internet
The anal fin of the male fish has evolved into a gonopodium, a stick-shaped organ used for reproduction. Source: Internet
The anal fin usually has two spines, while the dorsal fins are deeply notched or separate. Source: Internet