It is a relatively abundant freshwater cetacean with an estimated population in the tens of thousands. It is found throughout much of the Amazon and Orinoco river basins in Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru, and Venezuela. Since then, there have been periodic, undocumented claims of sightings of the Chinese river dolphin, but it is unlikely that a few individuals would be able to perpetuate the species considering the existing threats in the Yangtze River and the survival potential of small populations. The Amazon river dolphin, also known as the pink river dolphin or boto, lives only in freshwater. The pink river dolphin is widely distributed in.
By the end of the expedition, the team failed to find any evidence that the species survives and concluded that the Chinese river dolphin may now be extinct. River dolphins inhabit the drainage areas of the largest rivers in the world, mainly in developing countries.
ĭuring November and December 2006, an international research team including biologists from NOAA Fisheries conducted an intensive six-week multi-vessel visual and acoustic survey covering the entire historical range of the Chinese river dolphin in the main Yangtze channel between Yichang and Shanghai. Body colour varies with age: from grey to pink. In addition, it is listed as depleted under the Marine Mammal Protection Act. Amazon river dolphin Its taxonomy is still under debate two other species have been proposed: I. They tend to gather in places along the river where the best fishing spots are in. They are generally found alone or in pairs, and occasionally in small groups. The Chinese river dolphin is listed as endangered under the ESA. South Asian River dolphins are not demonstrative or acrobatic they usually surface quickly and unobtrusively although they do sometimes stick their snout right out of the water. Almost all vocalizations are at frequencies below 5 kHz, including whistles that last about 1 second. When they do vocalize, they do so in bouts of diverse, short duration calls of less than about half a second. Under the Endangered Species Act, NOAA Fisheries must list threatened and endangered marine species regardless of where they are found. Amazon river dolphins are relatively quiet animals, producing an average of only one vocalization per individual every 10 minutes.
It is found in the Yangtze River in China. The Chinese river dolphin is a freshwater dolphin and one of the most endangered animals on Earth.
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