Dall porpoises, The Fastest Aquatic Mammal
Dall’s porpoisesis the fastest aquatic mammal. They were named after an American Naturalist, W. H. Dall, who was the first person to identify the species. However, it was actually scientifically described by True in 1855. Dall’s porpoisesis found in the North Pacific and the South Bering Sea. Dall’s porpoise as fastest aquatic mammal is a species of porpoise found on the North Pacific. It came to worldwide attention in the 1970s when it was disclosed for the first time to the public that salmon fishing trawls were killing thousands of Dall’s porpoises and other cetaceans each year by accidentally capturing them in their nets. This fastest aquatic mammal is the only member of the Phocoenoides genus.
The unique body shape of the Dall’s porpoise makes it easily distinguishable from other cetacean species. The fastest aquatic mammal has a very thick body and a small head. The colouration is rather like that of a killer whale; the main body of the porpoise is very dark grey to black creeper, with very demarcated white patches on the flank and belly. The dorsal fin is set just back from the middle of the back and sits up erect. The upper part of the dorsal fin has a white to light grey “frosting”.
The fluke has a similar frosting. The adult fluke curves back towards the body of the animal, which is another distinguishing feature. It is larger than other porpoises, growing up to 2.3 metres (7 ft 7 in) in length and weighing between 130 and 200 kg. There is also sexual dimorphism in the species, with males being larger, having a deeper caudal peduncle and a pronounced hump behind the anus.Young of the fastest aquatic mammal have a greyish tint and dark-colored flukes.
They are one of the fastest porpoises known to humans. The fastest aquatic mammal can reach speeds of up to 30 knots. They do not jump often, but they are known as ‘spray’ dolphins because when they swim fast, their head and back produce a spray called a ‘rooster tail’. This fastest aquatic mammal loves to bow ride on the waves that are created by fast moving watercraft.