The Yangtze dolphin has been the victim of rapid industrialization and fishing in China, and it is likely to become extinct in the near future. Their vision is likely to have degenerated as a result of poor visibility in murky, sediment-laden river water. Unlike most dolphins, they have very flexible necks as their neck vertebrae are not fused. Millions of people use the rivers in any way they can, leaving little room for the dolphins and other freshwater creatures that rely on the rivers for their survival.There are two closely related species of river dolphin in South Asia: the Indus dolphin, locally called the bhulan, and the Ganges dolphin or susu. The surrounding floodplains are an integral component of the system, which is characterized by annual flood cycles that leave fine nutrient-rich alluvial deposits on the fertile flood plain and return organic biomass to the water.In the middle reaches, the rivers are many kilometres wide with biodiversity "hotspots" in large pools which are favourite feeding grounds for river dolphins and other South Asian aquatic animals. However, both the Indus and the Ganges dolphin are at risk from pollution by pesticides and fertilizers and from agricultural practices on the floodplains. They can either be the dolphins' protectors or just another factor in the ultimate disappearance of these unique animals. These features help to concentrate nutrients and fish in the river.South Asian river dolphins are blind; their eyes are tiny and lack lenses. One of the reasons why South Asian river dolphins are endangered is direct action by humans. Length wise, the South Asian river dolphin ranges from about 6.5 ft to about 8.5 ft (2 m to 2.6 m), with females being a bit larger than males.

However, this is one of the major factors that influenced the demise of the baiji in China and is likely to be extremely influential in the survival of the South Asian dolphins. Poor education, high illiteracy rates and low environmental awareness among rural communities and fishermen are important factors in the decline of South Asian river dolphins. These dolphins never see the ocean, and are a far cry from the popular image of a friendly, leaping marine variety© 1986 Panda Symbol WWF – World Wide Fund For Nature (formerly World Wildlife Fund) The dolphins have developed a sonar system to "see" their environment, and they can navigate, locate prey, boats and other dolphins and differentiate between the size and species of fish with this echo-location system.The tropical large river ecosystem in which the dolphins occur is not an isolated unit. Although schools of 3-10 individuals have been observed, Ganges river dolphins are not classified as gregarious as they are most commonly found alone.The life span of the Ganges river dolphin is thought to be about 26 years.Indus river dolphins are generally a solitary species; however groups of up to 30 dolphins have been observed. Migration: During summer, Ganges River dolphins travel down the Hoogly River to Calcutta anddown the Pusser River to Chalna. The dorsal fin is more of a low hump and the belly is rounded which gives these dolphins a stocky appearance. Millions of people use the rivers in any way they can, leaving little room for the dolphins and other freshwater creatures that rely on the rivers for their survival.There are two closely related species of river dolphin in South Asia: the Indus dolphin, locally called the bhulan, and the Ganges dolphin or susu. If we are even to begin to protect the river dolphins of South Asia, it is imperative to raise local people's awareness. Ganges river dolphins, P. gangetica gangetica, and 2. Globally, there are four species of dolphin which live only in fresh water: the Indus and Ganges dolphins of South Asia, the critically endangered baiji or Yangtze river dolphin of China, and the Amazon river dolphin or boto in the Amazon and Orinoco river systems. Untreated effluents are released into rivers creating a highly toxic environment where little can survive.The problem of bycatch of dolphins in fishing nets is hard to quantify as fishermen are generally reluctant to report kills.


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