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The bramble shark has a stout body with two small dorsal fins positioned far back and no anal fin. It can be readily identified by the large, thornlike dermal denticles scattered over its body, some of which may be fused together. It is purplish brown or black in color and grows up to 3.1 m (10 ft) long.
Ground sharks are the largest order of sharks, and include a number of common types such as the blue shark, catsharks, swellsharks and sandbar sharks. Members of the orders are characterized by the presence of a nictitating membrane over the eye, two dorsal fins , an anal fin , and five gill slits.
This robustly built, gray-colored shark is characterized by a short and broad snout, tiny eyes, a relatively large second dorsal fin, and a black blotch beneath each pectoral fin near the tip. Another identifying trait is its teeth, which are large, triangular, and serrated in the upper jaw and narrow, spear-like, and serrated only near the ...
Dorsal fin diagram with landmarks labeled. Fins allow the sharks to be able to guide and lift themselves. Most sharks have eight fins: a pair of pectoral fins, a pair of pelvic fins, two dorsal fins, an anal fin, and a caudal fin. Pectoral fins are stiff, which enables downward movement, lift, and guidance.
The pectoral fins, second dorsal fin, and lower caudal fin lobe are prominently tipped in black, while the first dorsal fin and dorsal caudal fin lobe are narrowly edged in black. The maximum size reached by the Pondicherry shark is uncertain due to a lack of large specimens, but is probably not much greater than 1 m (3.3 ft). [6] [10]
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 ...
Researchers have discovered evidence pointing to the first known case of a porbeagle shark — which can grow up to 12 feet long and 500 pounds — being killed by a large shark predator.
The fins (especially the dorsal, pectoral, and pelvics) of the sicklefin lemon shark are more falcate (sickle-shaped) than those of the otherwise very similar American lemon shark. The first dorsal fin is positioned closer to the pelvic than the pectoral fins. The second dorsal fin, nearly equal to the first in size, is located over or slightly ...