dorsal fin

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dorsal fin

n.
One of one or more unpaired fins on the back of fishes and certain marine mammals.

dorsal fin

n
(Zoology) any unpaired median fin on the backs of fishes and some other aquatic vertebrates: maintains balance during locomotion
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.dorsal fin - unpaired median fin on the backs of fishes and some other aquatic vertebrates that help to maintain balancedorsal fin - unpaired median fin on the backs of fishes and some other aquatic vertebrates that help to maintain balance
fin - organ of locomotion and balance in fishes and some other aquatic animals
Translations
selkäevä
nageoire dorsale
bakuggi

dorsal fin

References in classic literature ?
Great slate-colored backs and high serrated dorsal fins shot up with a fringe of silver, and then rolled down into the depths again.
Nor did he see the dorsal fin break surface and approach him from the rear.
Kidd could see the finger of the dial stand up dark against the sky like the dorsal fin of a shark and the vain moonlight clinging to that idle clock.
This same fish has the power of firmly catching hold of any object, such as the blade of an oar or the fishing- line, with the strong spine both of its pectoral and dorsal fin.
It is possible that barnacles have a preference for settling on the top of dorsal fins when present in low number (as shown in our study area) but, when they are present in high numbers, they may also spread to other segments of the fin, as observed by Toth-Brown and Hohn (2007).
Colour of holotype in alcohol pale brownish yellow, with a faint, dusky-edged, pale stripe, narrower than pupil, beginning above opercle and extending parallel to dorsal profile of postorbital head and nape to below rear half of first dorsal fin; dorsal fins with pale yellowish rays and faintly dusky membranes; remaining fins pale yellowish.
Some deep-bodied apogonids resemble Macquaria larvae but can be distinguished by having separate spinous and soft dorsal fins and a large, conspicuous gas bladder.
Ossie is longer and skinnier, lives in salt water and has square dorsal fins instead of a rounded hump.
The bucketmouth's upper jaw extends behind the eye and its spiny first dorsal fin is nearly separated from the soft-rayed second dorsal, whereas the smallmouth's jaw is shorter and its dorsal fins are connected.
Lightweight yet powerful, Airshirz provides clean, accurate cutting, snipping and trimming of dorsal fins.
1 in SL; colour of adult male in life generally mauve to pale yellowish with orange stripe between each scale row on side of body; blackish zone on lower two-thirds of caudal peduncle and adjacent body above last few anal rays; blackish patch immediately behind pectoral-fin base; pelvic and median fins reddish with narrow white margin on dorsal fins.
Secondary sexual dimorphism: Males with reduced hooks on rays of anal, pelvic, pectoral and dorsal fins.