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Dorsal fin of a shark. A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom.Many species of animals possessing dorsal fins are not particularly closely related to each other, though through convergent evolution they have independently evolved external superficial fish-like body plans adapted to their marine environments ...
The first dorsal fin is composed of four to seven strong, disunited spines which vary in length; the second dorsal fin and anal fin are small, spineless and rounded, situated far back of the convex head. The pectoral fins are somewhat elongate and the caudal fin is truncate.
The pectoral, dorsal, pelvic and caudal fins are dusky, and the anal fin are pale. [3] As is usual with fish fins, the pectoral fin allows the fish to turn left or right and also support the stability of the fish. The dorsal fin, located well back on the garfish helps it make sharp turns and stabilise rolling. [5]
The adipose fin is a soft, fleshy fin found on the back behind the dorsal fin and just forward of the caudal fin. It is absent in many fish families, but found in nine of the 31 euteleostean orders ( Percopsiformes , Myctophiformes , Aulopiformes , Stomiiformes , Salmoniformes , Osmeriformes , Characiformes , Siluriformes and Argentiniformes ...
Zebrasoma desjardinii, the Red Sea sailfin tang, Desjardin's sailfin tang, Indian sailfin tang or Indian sailfin surgeonfish, is a species of marine ray-finned fish belonging to the family Acanthuridae, the surgeonfishes, unicornfishes and tangs. This fish is found in the Indian Ocean.
This species grows up to 8 centimetres (3 in) total length.It is easily differentiated from all other cardinalfishes by its tasseled first dorsal fin, elongated anal and second dorsal fin rays, deeply forked caudal fin, and color pattern consisting of three black bars across the head and body and prominent black anterior edges on the anal and second dorsal fin. [4]
The dorsal fin has 14 spines and 10 soft rays, the anal fin has 7 spines and 9 soft rays, there are 23 vertebrae [10] and the caudal fin is slightly forked. [11] The longest spine in the dorsal fin is shorter than the distance between the front of the eye and the posterior edge of the operculum while the length of the longest dorsal ray is ...
The anal fin has three spines and 12 to 14 soft rays. The base of the anal fin is longer than that of the second dorsal fin. The pectoral fin has 14 to 16 unbranched rays and has a length equivalent to 24 to 29% of the standard length. Its tip does not reach the tip of the pelvic fins. There are eight pectoral filaments, sometimes nine, and the ...
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