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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 dorsal fin is shaped like a scythe. Permit tails are also deeply forked, and their bodies are compressed laterally, making the fish tall and thin when viewed from the front. [3] The average permit has six or seven dorsal spines, and 18 to 21 soft rays. The anal fin has two or three spines, and 16 to 18 soft rays. [2] Both dorsal and anal ...
The Spanish flag has a body which is oblong with a large head, the length of the head is the same as the body's depth. [4] The standard length is 2.3 to 2.5 times the depth of the body. The dorsal profile of the head and the intraorbital area are convex. They have a rounded preopercle which has a large, curved spine at its angle and fleshy ...
Dorsal fins: Located on the back of the fish, dorsal fins serve to prevent the fish from rolling and assist in sudden turns and stops. Most fishes have one dorsal fin, but some fishes have two or three. In anglerfish, the anterior of the dorsal fin is modified into an illicium and esca, a biological equivalent to a fishing rod and lure.
The caudal fin is strongly divided and rigid, with a slender, ridged base. The first (spiny) dorsal fin and the pelvic fins are normally retracted into body grooves. Species lengths vary from the 20 cm (7.9 in) of the island mackerel to the 4.58 m (15.0 ft) recorded for the immense Atlantic bluefin tuna .
Southern right whale dolphins can be easily distinguished from other cetacean species within their range as they are the only dolphins without dorsal fins in the Southern Hemisphere. They have streamlined and graceful bodies, a single blowhole and a short and defined beak, possessing between 39 and 50 teeth per row. [5] [6]
Body slender, elongate, cylindrical; head pointed, eye large; snout about as long as eye; mouth large, slightly oblique, at front, lower jaw longer than upper jaw, visible from above when mouth is closed;many rows fine pointed teeth on jaws, tongue and (in 2 bands) on side of roof of mouth; fins without spines; one dorsal fin in mid-body, with a small skin-flap fin behind it above anal fin ...
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 ...