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 ?
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.
In larger, preflexion larvae, the first three dorsal fin rays are inserted at the level of the posterior margin of the brain (Fig.
7 Lateral Line Pores (a) 33 Dorsal Fin Spines 8 Dorsal Fin Rays 18 Anal Fin Rays 14 Pectoral Fin Rays (a) 17 Pelvic Fin Rays (a) 4 Principal Caudal Fin Rays 11 (a) Value reported is the average of left and right side measurement or count.
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.
yunnanensis Dorsal fin rays 4 Adipose-fin Adipose-fin not confluent with the caudal-fin Anal-fin rays 10 Pectoral-fin rays 7 Pelvic-fin rays 7 Jaws Upper jaw slightly longer than the lower one Teeth on upper jaws No separation gap in the midline Lateral line Complete A.
The Needham Pond population had significantly different numbers of dorsal fin spines, dorsal fin rays and anal fin rays than the populations in other regions.
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.