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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 ...
The five pairs of gill slits are small, with the last two over the pectoral fin bases. [6] The two dorsal fins are placed far back on the body; the first is larger than the second and originates over the bases of the pelvic fins. The pectoral fins are large. In males, the inner margins of the pelvic fins are merged into an "apron" over the ...
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.
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 has 10 spines and 14-15 soft rays while the anal fin contains 3 spines and 8 soft rays. [2] The long perctoral fin extends as far as the anus and contains16-17 rays. [7] This fish attains a maximum total length of 128 cm (50 in), although 60 cm (24 in) is more typical, and the maximum published weight is 28.6 kg (63 lb). [2]
[2] [3] The body is covered by dermal tubercles, which are concentrated along the ventral and lower side regions of the body. [3] Each dorsal fin has 333 to 371 rays, which shorten and then become longer at the middle of the body. [3] [2] Its pelvic fin contains more than three membranous appendages and is a single elongated ray. [2]
Chaunax sea toads have a rotund, slightly laterally flattened body which tapers to a small rounded caudal fin. The head is large and globelike with a large oblique mouth and eyes set high on the head. The eyes are covered in transparent skin, resembling a window. The teeth in the mouth are vertical, small, thin, and sharp.
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 ...