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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 ...
Removable Fin Systems [7] The most common types of fins used today, removable fins are surfboard fins that can be unscrewed from the surfboard and be replaced by different fins or be moved about the board for a different setup in maneuverability and stability. In the early '90s, three Australian surfers invented the fin control system (FCS).
Siganus rivulatus, the marbled spinefoot, rivulated rabbitfish or surf parrotfish, is a gregarious, largely herbivorous ray-finned fish of the family Siganidae. Its natural range encompasses the western Indian Ocean and the Red Sea from where it colonised the Mediterranean Sea by Lessepsian migration through the Suez Canal .
The disc has 15 to 19 laminae. Both the dorsal and anal fins are relatively short; the dorsal fin has 20 to 26 soft rays, the anal fin has 20 to 25 and the pectoral fins have 20 to 24 soft rays. The dorsal colouring is dark grey to black and the ventral surface is rather paler. Apart from the tips of the outer rays of the caudal fin, which are ...
The origin of the dorsal fin is further back than the origin of the pectoral fins. The dorsal and anal fins are confluent with the small caudal fin. The ventral surface of this fish is darker than the head and dorsal surface, and the pectoral, dorsal and anal fins are pale [3] with yellowish-white edges. [4]
According to biologists, the dorsal fin’s size in such shallow water should reveal part of the shark’s back or a second dorsal fin — neither of which are visible.
Fins first evolved on fish as a means of locomotion. Fish fins are used to generate thrust and control the subsequent motion. Fish and other aquatic animals, such as cetaceans, actively propel and steer themselves with pectoral and tail fins. As they swim, they use other fins, such as dorsal and anal fins, to achieve stability and refine their ...
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 ...
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