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Caudal/Tail fins: Also called the tail fins, caudal fins are attached to the end of the caudal peduncle and used for propulsion. The caudal peduncle is the narrow part of the fish's body. The hypural joint is the joint between the caudal fin and the last of the vertebrae. The hypural is often fan-shaped.
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 top stripe often becomes broken into dots behind the dorsal fin. Small, almost invisible scales cover its body. The lower sides of its body are white, yellow, or silver. However, during the breeding season, this area becomes brilliant red on the males. The females likewise exhibit a colorful, green ventral stripe.
The anal fin contains 1–4 spines anteriorly and 20–39 soft rays with their height, direction, origin, and terminus mirroring those of the soft dorsal fin. Along the belly are a series of spinous scutes—scales modified into hard, bony plates—forming an armoured ventral keel. Similar scutes also cover the base of the dorsal and anal fins.
The anal and dorsal fins are all separated from each other. [6] The pelvic fins are small with an elongated first fin ray. [7] The upper side of the haddock's body varies in colour from dark grey brown to nearly black while the lower part of the body is dull silvery white.
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 ...
The large pectoral fins are normally carried horizontally, perhaps helping the fish attain the profile of a shark. The first dorsal fin has six to nine independent, short, stout, sharp spines. The family name Rachycentridae, from the Greek words rhachis ("spine") and kentron ("sting"), was inspired by these dorsal spines. The mature cobia has a ...
The dorsal, anal and caudal fins are fused and pelvic fins are lacking. Dorsal fin begins mid body creating a long continuous fin where in other species it begins more posterior and is not as prominent in length. Their body movement depends highly on undulation originating near the anterior axial end.