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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.
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 ...
A fish can have up to three dorsal fins. The dorsal fins serve to protect the fish against rolling, and assist it in sudden turns and stops. 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 bones that support the dorsal fin are called pterygiophores.
The dorsal fin originates from above the (relatively large) eyes and runs the entire length of the fish. Of the approximately 400 dorsal fin rays, the first 10 to 13 are elongated to varying degrees, forming a trailing crest embellished with reddish spots and flaps of skin at the ray tips.
The queen angelfish has a broad, flattened, oval-shaped body with triangular tail fin, a reduced, dulled snout and a small mouth containing bristle-like teeth. [13] [6] The dorsal fin contains 14 spines and 19–21 soft rays, and the anal fin has 3 spines and 20–21 soft rays. [2] The dorsal and anal fins both dangle behind the body. [6]
The juveniles do not have the two black bars and have two black stripes which run horizontally along the middle of the flanks and a black blotch close to the caudal fin base and the head is vivid yellow. [4] The dorsal fin contains 12 spines and 16-18 soft rays while the anal fin contains 3 spines and 9 soft rays. This species attains a maximum ...
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 ...
There are two dorsal fins: a large triangular first dorsal fin and a low rectangular or depressed second dorsal fin. For defense, some chimaeras have a venomous spine on the front edge of the dorsal fin. [4] In many species, the bulbous snout is modified into an elongated sensory organ, capable of electroreception to find prey.