Gangetic dolphin or Susu is also known as South Asian river dolphin is the mammal that thrives in water. They are found in Nepal, India, Bangladesh and Pakistan rivers. It is necessary for the dolphin to come to the surface for breathing frequently. There are various species of dolphin some can live in fresh water and other can live in the saline water. There is the sexual dimorphism in dolphin as male is larger than female.
The morphology of the south Asian Dolphin is different from the others dolphin commonly available. The teeth of the dolphin are visible even after the mouth is closed. The length of South Asian river dolphin can range up to 2.7 meters. It is estimated that up to 1800 individuals are survived in around the globe.
These dolphins are also known as blind dolphin because the eye is of no use in murky water. They produce the distinct sonar for echolocation. Their primary diet comprises mainly of the fishes. Due to various anthropogenic factors, this dolphin population is in critically endangered phase.
Interesting Facts about Gangetic Dolphin are Summarized Below:
This is the unique way by which the dolphin navigates. This is the mechanism that aids in locomotion of dolphin.
2. Delayed Sexual Maturity
Dolphin reaches the sexual maturity at the age of 10 years.
3. Cause of Decrease in Population
Fisherman considers the oil of the dolphin as the potent tool for catching fish. It is also consumed as the aphrodisiac. Pollution of any kind adversely affects the population of dolphin. Large dam made by humans’ causes disturbance in migratory behavior of dolphin.
4. Blind River Dolphin
Dolphin live in turbid water so the eye is not a potential tool for survival. Due to this eye is nonfunctional instead another organ for echolocation has developed.
For the purpose of breathing small blowhole is located on the top of the head. This helps in normal breathing of the Dolphin.
It is essential to come is the surface for breathing in every 2 minutes. The dolphin baby comes to surface frequently for breathing than the adult.
7. Life Spain
The life Spain of the Gangetic River dolphin varies greatly. The longest living male is recorded to have lived for 28 years old.
8. Species Diversity
Before 1970s south Asian dolphin was regarded as the single species. Later due to the difference in the physiological and morphological character they are assigned to separate species. Recent, Molecular study did not find many variations in the mitochondrial DNA. Nowadays south Asian dolphin is classified as single species. Two species previously classified as separate species as assign as subspecies.