anal fin

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Related to Anal fins: heterocercal fin, Pectoral fins, pelvic fin, Unpaired fins, ventral fin

anal fin

[′ān·əl ‚fin]
(vertebrate zoology)
An unpaired fin located medially on the posterior ventral part of the fish body.
References in periodicals archive ?
The main part of the body is covered with cycloid scales, but unlike females, males have also ctenoid scales on the head on the eye-side and on the trunk behind the head and close to dorsal and anal fins.
Fins almost entirely scaled except for membranes of spinous dorsal and anal fins and posterior portions of the unbranched pectoral rays.
rei-t-hertz), lower anal fin base length and caudal fin length in males, and the lower head depth (except in A.
Males differ from male Cyprinodon by lacking a terminal black band on the caudal fin and by having a large, black, lateral blotch just anterior to the caudal peduncle and extending onto the anal fin (Fig.
In the absence of well-preserved dorsal and anal fins, the ventral caudal keel can be used to orient fragmentary specimens correctly.
In approximately half the medaka with the female gonadal phenotype in all genistein treatments, the dorsal and/or anal fins were male-like in appearance.
Two of the larger specimens also had the bright, iridescent blue caudal and anal fins characteristic of adult male L.
Bluefin tuna have small 'finlets,' which run from their dorsal and anal fins to their tail.
Big-eye tuna has shorter second dorsal and anal fins, and marginally larger eyes than the yellowfin tuna.
All are very similar morphologically, having an elongate body up to 280 mm in total length, scales aligned in dermal plicae for the length of the body, long dorsal and anal fins, and no pelvic fins.
Removing numerous anal fins with a hacksaw, I know that preparing, reading, and interpreting hard parts is quite an art.