December 3, 2021 3:48 PM +05
Population of Dolphins
The common dolphin (Delphinus delphis) is one of the most abundant small cetaceans on earth. Nevertheless, some populations that have been decimated by capture must be classified as threatened, such as those in the Black Sea, the Mediterranean, and the eastern Pacific. The common dolphin also continues to be caught in Japan, Norway and South America. It is even actively hunted there because of alleged competition for fish stocks - hire someone to do my homework . Off the Japanese coast, for example, entire pods of dolphins are driven ashore every year and bestially slaughtered. Whale meat is still considered a highly prized, desirable delicacy in Japan today. Unfortunately, dolphins in particular very often get caught accidentally in the life-threatening fishing nets such as drift nets or the purse seine nets used in the tropical East Pacific by encircling dolphins, for example, when fishing for tuna. There, yellowfin tunas are associated with dolphins.
Body shape and characteristics
Most dolphins have a long, streamlined body. They are basically round, torpedo-like in shape with elastic body coverings. River dolphins even have hair. Another distinguishing feature is a strongly arched forehead and, in most species, a beak-shaped mouth. Dolphins are generally among the smallest cetaceans. With the exception of the killer whale (orca), which can reach a length of up to 9.7 m and is thus clearly the largest representative among the dolphins and, unlike the other species of its group - help me with my biology homework , also has no beak-shaped mouth. The nostril is located at the top of the head.
There are no external hind extremities, but there is a large, flat, horizontally widened caudal fin that is used for locomotion. The paired pectoral fins serve for steering, and the vertically upward projecting dorsal fin helps stabilize the body in the water.
All of these features, along with the streamlined body, are characteristic of a marine mammal extremely adapted to life in the water - expert same day essay writer . Their smooth skin also helps to reduce water resistance. Dolphins are therefore able to travel at a maximum speed of 55 kilometers per hour when moving in the sea.
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