dorsal fin

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  • noun

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unpaired median fin on the backs of fishes and some other aquatic vertebrates that help to maintain balance

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References in periodicals archive ?
Comparison of age estimates from scale, opercular bone, otolith, vertebrae and dorsal fin ray in Labeo rohita (Hamilton), Catla catla (Hamilton) and Channa marulius (Hamilton).
Meristic counts included: trunk rings, tail rings, dorsal fin rays, dorsal fin rings (subdorsal rings) over the trunk, subdorsal rings over the tail, and total dorsal fin rings.
It is distinguished from most congeners by the lack of filamentous extensions of the dorsal fin rays in males and a rounded caudal fin margin, a combination of features shared only by P.
Side of tail mainly tan shading to brownish caudad; brood pouch folds pale with light shading of grey, mostly concentrated along posterior margin of pouch; venter of tail elsewhere mainly tan shading to brownish caudad; pectoral and anal fins pale to transparent; dorsal fin rays each with 2-3 dark markings, otherwise pale; caudal fin dark brown with narrow pale margin.
N = 85 Mean Mode Meristic measures Scales in lateral series 40 40 Gill rakers on lower limb of the 38 38 first gill arch Prepelvic scutes 16 16 Postpelvic or preanal scutes 12 12 Dorsal fin rays 15 15 Anal fin rays 15 16 Morphometric measures in thousandths of the standard length Cephalic length 239.
Fork lengths were measured (nearest mm) and dorsal fin rays were sampled during the creel survey program.
Dorsal fin rays 10-13; anal fin rays 14-16; caudal fin rays 2224; pectoral fin rays 12-14; pelvic fin rays 7.
Diagnosis: A species of Chelidoperca with the following combination of characters: Dorsal fin rays X, 10; anal fin rays III, 6; pectoral-fin rays 15; lateral-line scales 42; gill rakers 3 + 9; caudal rays 17.
Diagnosis: Caudal fin deeply forked, lobes attenuate, filamentous, particularly in males; caudal concavity 23-32% SL; dorsal fin rays 16-18; dorsal fin origin anterior to upper end of gill opening; male with 2nd and 3rd dorsal fin spines elongated, flexible, with small fleshy tab at tip; 3rd dorsal fin spine elongated in adult female, rear end of fin rounded; anal fin angular, rays 7-8, 3rd to 5th rays elongated; pectoral fins rounded, rays 19-21, uppermost 1 or 2 rays unbranched; pelvic fins pointed.
Measurements are expressed as times in standard length: gill rakers on first gill arch 6+9=15 (6+10=16); pored scales in lateral line scale row 23 (23); median predorsal scales 17 (18); circumferential scales (in front of pelvic fins) 13 (13); circumpeduncular scales 13 (13); peduncular scales (from base of last anal fin ray to end of hypural plate) 9 (9); dorsal fin rays 20 (20); anal fin rays 27 (28); pectoral fin rays 7 (7); pelvic fin rays 5 (5); and caudal fin rays i7+7i (i8+8i); head 3.
Diagnosis: Dorsal fin rays 10 or 11; anal fin rays 9-11; pectoral rays 17-19; small spinules on head and body except for snout, posterior caudal peduncle and base of fins; snout length 4.