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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 ...
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.
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 caudal fin is homocercal, meaning the upper and lower lobes are about equal in size. The spine ends at the caudal peduncle, the base of the caudal fin, distinguishing this group from those in which the spine extends into the upper lobe of the caudal fin, such as most fish from the Paleozoic (541 to 252 million years ago). The neural arches ...
The gray angelfish is a popular fish in the aquarium trade. Specimens enter the trade from Florida throughout the year. Between 1995 and 2000 over 12,000 fish of this species entered the trade, which originated in Brazil. The species has been bred in captivity. It is also caught in some areas for food. [1]
The Digital Fish Library (DFL) is a University of California, San Diego project funded by the Biological Infrastructure Initiative (DBI) of the National Science Foundation (NSF). The DFL creates 2D and 3D visualizations of the internal and external anatomy of fish obtained with magnetic resonance imaging (MRI) methods and makes these publicly ...
This gives the dorsal and anal fins a noticeably scythe-like shape. [3] The dorsal fin of the lookdown has 9 spines and 23 rays, while the anal fin has only 3 spines and 18 rays. [4] Like the Atlantic moonfish, it has a deep, rhombus-shaped, laterally-compressed body. [3] The head has the mouth set low and the eyes high.
The dorsal fin contains between 7 and 10, normally 9, spines and 24–27 soft rays while the anal fin has 1–3 spines and 22–26 soft rays. [3] The overall colour is pale brown with a white abdomen. The pectoral fins are coloured greenish-blue and yellow while the dorsal fin is yellow. [4]