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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 ...
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 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 ...
Polypterids are elongated fish with a unique series of dorsal finlets which vary in number from seven to 18, instead of a single dorsal fin. Each of the dorsal finlets has bifid (double-edged) tips, and are the only fins with spines; the rest of the fins are composed of soft rays. The body is covered in thick, bonelike, and rhombic scales.
The pectoral fin is level with the eye on each back side of the lined seahorse's head. The dorsal fin is located on the back of the skeleton and is level with the stomach–chest area. Female dorsal fins are slightly larger than the male's and are located lower on the back.
The mouth is reddish at the corners where there are small barbels. When breeding the mature males develop a red stripe along the sides [3] on the belly, mouth, gill cover and pectoral fin base. The dorsal fin and the anal fin each have 8 soft rays and the lateral line has 66–84 scales. They can grow to 36 centimetres (14 in) in total length.
A mature male giant trevally showing the black colouration common in these older fish The giant trevally is widely distributed throughout the tropical and subtropical waters of the Bay of Bengal and Indian and Pacific Oceans, ranging along the coasts of three continents and many hundreds of smaller islands and archipelagos . [ 15 ]
The eastern mosquitofish is a small, light-colored fish with semitransparent fins. The females usually have a black stripe near their eye area and light spots can be seen on the caudal and dorsal fins of both sexes. [4] Due to its similar size, shape, and reproductive habits, it can easily be mistaken for a guppy. [5]