ventral fin

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Related to ventral fins: pectoral fin

ventral fin

ventral fin
A vertical, stabilizing fin on the lower rear portion of a fuselage that helps increase directional stability, especially at higher Mach numbers, by increasing the area behind the vertical axis.
References in periodicals archive ?
Sexual dimorphism: Males are smaller than females with proportionally longer pectoral, anal and ventral fins. The caudal peduncle in males is higher those in females.
chrysospilos has ventral fins displaced forwards, underneath the pectoral fins, and joined at their base in a type of sucker that lets them climb up the roots and trunks of the trees of the mangrove swamp.
length of pectoral fin; H max, greatest body depth; Width max, greatest width taken across head; H min, least body depth; Pec-anus, distance from dorsal insertion of the pectoral fin to anal opening; Sn, snout; OD1, origin of first dorsal fin; OD2, origin of second dorsal fin; OV, origin of ventral fin; TV, tips of ventral fins; OA, origin of anal fin; TA, origin of last ray of anal fin; Caud.