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The dorsal fin origin is just in front of the origin of the pelvic fins [2] and the dorsal fin is concave on its upper margin, with a strong, smooth and stiff spine. [3] The caudal fin is deeply forked with small tubercules on the rays. [2] The overall colour is brown with a paler abdomen and it may have dark tips to the fins. [3]
The humpback dolphin is a coastal species found from Africa and India south to Australia, with variations in different regions. It has a distinctive hump in front of its dorsal fin and a keel on its belly. The dorsal fin is somewhat curved. Its pectoral fins are relatively small, and the tail flukes have a noticeable notch in the middle.
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 ...
Photo-identification is a technique used to identify and track individuals of a wild animal study population over time. It relies on capturing photographs of distinctive characteristics such as skin or pelage patterns or scars from the animal. In cetaceans, the dorsal fin area and tail flukes are commonly used.
Males, in particular, can have distinct humps under their dorsal fins. [3] They can also be distinguished by a robust body with a well-defined rostrum. They are typically slate gray on the back and sides, fading to light gray ventrally. The dorsal fin is small, slightly falcate, and triangular, and sits on a distinctive and well developed ...
The humpback chub (Gila cypha) is a federally protected fish that lived originally in fast waters of the Colorado River system in the United States.This species takes its name from the prominent hump between the head and dorsal fin, which is thought to direct the flow of water over the body and help maintain body position in the swift currents of the Colorado river.
Naso brachycentron has 4 or 5 spines and between 28 and 30 soft rays supporting the dorsal fin while the anal fin is supported by 2 spines and 27 or 28 soft rays. The depth of the body fits into its standard length between 2.2 and 2.7 times. In fish with a standard length greater than about 20 cm (7.9 in) a hump begins to develop in the back so ...
The flippers are broad and rounded. The finless porpoise (Neophocaena phocaenoides) is similar and has no back fin; the humpback dolphin (Sousa chinensis) is larger, and has a longer beak and a larger dorsal fin. [5] It ranges in weight from 90 to 200 kg (200 to 440 lb) with a length of 2.3 m (7.5 ft) at full maturity.