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A dorsal fin is a medial, unpaired fin that is located on the midline of the backs of some aquatic vertebrates. In development of the embryo in teleost fish, the dorsal fin arises from sections of the skin that form a caudal fin fold. [ 7 ]
Dorsal fin of a chub (Squalius cephalus) The dorsal fins are located on the back. 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 ...
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 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 pelvic fins are similarly elongated and adorned ...
Depending on species, they grow to 30–110 cm (12–43 in) long. Their distinctive first dorsal fins take the form of a modified oval, sucker-like organ with slat-like structures that open and close to create suction and take a firm hold against the skin of larger marine animals. [5]
The smoothskin scorpionfish is a small, well-camouflaged fish, it has between 14 and 16 spines and 5 or 6 soft rays in its dorsal fin and 3 spines and between 3 and 6 soft rays in its anal fin. [2] It has an orange body with a distinctive cream patch to the rear. The fish may reach 50 mm in total length.
The anal fin has 3 spines and 14–19 soft rays. The pectoral fins have 16–18 rays, and there are 4 pectoral filaments. The upper sides of the head and body have a slight darkish silver tinge, lighting in the lower flanks. Both dorsal fins show a blackish anterior margin, with the remaining parts of the fins translucent and slightly dusky.
The dorsal fin contains between 22 and 25 spines and 14 to 17 soft rays, the anal fin has between 9 and 11 spines and 4 to 7 soft rays. The dorsal fin is joined to the rounded caudal fin. The large pectoral fins are located low on the body and there are no pelvic fins. [8] This species reaches a maximum total length of 35 cm (14 in). The ...