ventral fin


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ventral fin

n.
A fin, such as a pelvic fin or an anal fin, that is found on the ventral side of a fish.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
References in periodicals archive ?
Ventral fins are without any markings, almost completely transparent yellow with some pale white at the basis and white at the tip.
Origin of first dorsal fin from 2 to 7 scales in front of tips of ventrals; origin of ventral fins 1 to 5 scales in front of tips of pectorals.
Fin: ventral Fin. TABLE 4 Morph metric features of fish species caught in Anambra River, Nigeria N TL SL HL BD BG WG Papyrocranus afer 27 571 395 80 90 160 301 Alestes nurse 42 200 140 60 80 120 400 Macrolepidotus cuvier 33 481 401 90 130 180 700 Citharinus citharius 52 300 231 69 101 176 900 Labeo coubie 31 600 501 122 140 191 1001 Distichodus rostatus 28 480 411 96 110 171 1200 Clarias anguillaris 21 800 602 180 171 196 1160 Synodontis clarias 40 240 203 109 190 170 270 Schilbe mystus 26 280 210 80 140 130 240 Tilapia zillii 18 275 201 79 97 200 230 All measurements are millimeters (mm): TL: Total Length; SL: Standard Length; HL: Head Length; BD: Body Length; BG: Body Girth; BW: Body weight (mg).
Ventral fin lenght###18.4###15.8###17.0###0.8 17.3###13.8###15.4###1.0###17.9###13.7###16.1###0.9 17.1###13.5###15.6###0.9
The ventral fins are short, and approximately at the same level as the third branched dorsal-fin ray.