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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 dorsal fin contains 9–10 spines and 22–25 soft rays while the anal fin contains 3 spines and 7 soft rays. [2] The adults are predominantly blue-grey in colour marked with bright yellow to golden orange spots these frequently form a pattern of lines on the head. The inside of the mouth is vivid orange to red.
They normally show a blackish blotch on the membrane of the first dorsal fin between the rearmost 3 or 4 spines. [7] The colour of the dorsal and caudal fins vary from yellow to green while the anal and pelvic fins may be yellow through to silvery white; [8] in spawning season, males develop pronounced red or yellow color on their lower fins. [7]
They are prone to fin nipping because many other fish are attracted to their long flowing fins. Phoenix is the long-tailed version of the eggfish goldfish. It is the veiltail equivalent of the dorsal finless goldfish. Izumo Nankin goldfish - It is similar to the ryukin goldfish, except it has no dorsal fin. It has a short, deep body with a ...
They may be distinguished from walleyes by the distinctly spotted dorsal fin, by the lack of a white splotch on the caudal fin, by the rough skin over their gills, and by their generally more brassy color, or darker (almost black) color in some regions. The typical sauger is 300 to 400 g (11 to 14 oz) in weight.
Ocelli on dorsal fin and caudal peduncle. A. ocellatus examples have been reported to grow to about 45 cm (18 in) in length and 1.6 kilograms (3.5 lb) in weight. [2] The wild-caught forms of the species are typically darkly coloured with yellow-ringed spots or ocelli on the caudal peduncle and on the dorsal fin. [6]
The caudal (tail) fin is a main source of momentum in typical kinematic models of the C-start escape response but the bluegill draws a majority of its momentum from the body bending associated with the response, as well as its dorsal and anal fins. [29] The dorsal and anal fins' roles as propulsors during escape response suggest that the size ...
The species' main color is silver-white to pale green. Its back is dark, with white sides and belly, and with narrow dark stripes running lengthwise on its sides. It has large, rough scales and two dorsal fins. The more anterior dorsal fin is much harder and appears to have spines on it.