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The shape, size, position and colour of the dorsal fin varies with the type of billfish, and can be a simple way to identify a billfish species. For example, the white marlin has a dorsal fin with a curved front edge and is covered with black spots. [4] The huge dorsal fin, or sail, of the sailfish is kept retracted most of the time. Sailfish ...
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.
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 male's dorsal fin is pointed, while the female's is rounded or curved. [3] They carry touch-sensitive cells on their thread-like pelvic fins. [4] Dwarf gouramis sold in fish stores may also be solid colors (e.g., powder blue dwarf gourami or red flame variety) which are nothing but captive bred color morphs of the same species.
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]
Regalecus russelii can grow up to 8 meters in length, and it has two dorsal fin crests that can reach 1 meter high. [2] The species can be distinguished by its red dorsal fin crests, light brown head, and scaleless, silver body. [2] [3] The body is covered by dermal tubercles, which are concentrated along the ventral and lower side regions of ...
Lionfish have 18 venomous spines total: 2 pelvic spines, 3 anal spines, and 13 dorsal spines. Pterois is a genus of venomous marine fish, commonly known as the lionfish, native to the Indo-Pacific. It is characterized by conspicuous warning coloration with red or black bands and ostentatious dorsal fins tipped with venomous spines.
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.