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Indus Dolphin

The Ganges River

indus dolphin

Platanista Gangetica Gangetica and

Indus River

Dolphin Platanista Gangetica minor are two sub species of

freshwater

or

river dolphins

found in the Indian sub continent. From the 1970s they had commonly been regarded as separate

species

. However in 1998, a seminal work on cetacean taxonomy listed them as a single

species

once again see taxonomy below. The single species is likely to have either the

Ganges

and

Indus River Dolphin

or

Indian River Dolphin

as its common name, although neither has yet spread into wide usage and the latter does not reflect that the

Indus

subspecies is resident primarily in Pakistan.

Taxonomy

Until the 1970s the Indus and
Ganges
River Dolphins were regarded as a

single species

, first named by Roxburgh in 1801. However at that time it became clear that two populations, one centered on the

Ganges River

in India and the other in the

Indus River

in Pakistan had not interbred for many hundreds of years. Based on differences in skull structure, scientists declared the two populations as separate species. However Rice, in his taxonomic classification of cetaceans that has become standard in the field, found that there were insufficient morphological differences to warrant distinction at the species level. Thus just one species is recognised in the genus Platanista and four true river

dolphin

species, each in its own family as well as genus.

Physical description

The Ganges and Indus River Dolphins are essentially identical in appearance. They have the long, pointed snout characteristic of all river dolphins. Both the upper and lower jaw sets of teeth are visible even when the mouth is closed. The snout thickens towards its end. The species does not have crystalline eye lens, rendering it effectively blind, although it may still be able to detect the intensity and direction of light. Navigation and the hunt for food is carried out using echo location. The body is a brownish colour and stocky at the middle. The species has only a small triangular lump in the place of a dorsal fin. The flippers and tail are thin and large in relation to the body size, which is about 22.2m in males and 2.4 2.6m in females. The life span and other life history data is unknown. The species feeds on shrimp and small fish that prefer the waters close to the river bed. Dolphins are usually encountered on their own but have traveled in groups more often historically, when populations were larger.

Population and distribution

The

Ganges subspecies

can be found in the

Ganges River

as well as the Brahmaputra, Meghna, Karnaphuli and Sangu river systems of India, Bangladesh, Nepal and Bhutan. Relatively high population densities have been observed near the Vikramshila Gangetic Dolphin Sanctuary in Indian and in the

Sangu River

in southern Bangladesh. Very few individuals perhaps 20 are present in Nepal in the Karnali River. The total population is unknown, but certainly numbers in the hundreds and there are perhaps as many as a few thousand but see Human interaction below. The Indus subspecies resides primarily in the Indus River in Pakistan. In the nineteenth century its range was approximately five times greater than it is today, and included the Sutlej, Ravi, Chenab and Jhelum tributaries of the Indus. The highest population density occurs in Sindh Province. A comprehensive population census of the Indus Dolphin that was completed in 2001 by

WWF Pakistan

concluded that there are approximately 1,100 individuals alive today.

Human interaction

Both species have been very adversely affected by the use by humans of the river systems in the sub continent. Entanglement in fishing nets can cause significant damage to local population numbers. Some individuals are still taken each year and their oil and meat used as a liniment, as an aphrodisiac  and as bait for catfish. Irrigation has lowered water levels throughout both subspecies ranges. Poisoning of the water supply from industrial and agricultural chemicals may have also contributed to population decline. Perhaps the most significant issue is the building of more than 50 dams along many rivers, causing the segregation of populations and a narrowed gene pool in which dolphins can breed. There are currently three sub populations of Indus Dolphins considered capable of long-term survival if protected.

Indus dolphin rescue drive from 15th

KARACHI: A five day operation for the rescue of the blind Indus dolphin Platanista minor, one of the worlds most threatened species of freshwater dolphin, will begin on Jan. 15, sources in the Sindh Wildlife Department, which will conduct the operation, told Daily Times on Thursday. The operation, which will continue until Jan. 20, will be in collaboration with the Lahore Zoo and United Nations Development Program UNDP. The sources said that between August and December, the department spotted 33 dolphin stranded in the canals of the Sukkur and Guddu Barrages in Sindh. So far, nine of them have been rescued. Seven of the stranded cetaceans are as young as one or two years, the sources said. It is for the first time that so many stranded dolphins have been spotted in canals, the majority of them calves, the sources added. The sources said shortage of water and food and the current repair work on the Sukkur Barrage were the main reasons for the stranding of the aquatic mammals, which belong to the family Delphinidae and are related to the tooth whales. The Blind Indus Dolphin Rescue a $50,000 UNDP fund, is helping the Sindh Wildlife Department to rescue the endangered species, the sources said. Many Indus dolphins slip into canals from the river during flood seasons, or at the time of the opening of barrage gates, and become stranded. The stranded animals are put in large tubs to be transported back to the river, the sources said. Unlike the large marine species of the dolphin, the Indus dolphins are only five to six feet long. The sources said conservationists from Pakistan and abroad have been invited by the department to oversee the rescue operation. Among the foreign invitees is French
Local Name:

Bhulan

( SINDHI & URDU )
Both subspecies: Blind River Dolphin,

Side swimming Dolphin

, Susu
Ganges subspecies:

Gangetic Dolphin

, Ganges Susu
Indus subspecies: Bhulan, Indus Dolphin,

Indus Susu

Indus Blind Dolphin

Names

Scientific classification

Kingdom Animalia
Phylum Chordata
Class Mammalia , Eutheria
Order Cetacea Odontoceti
Family Platanistidae
Genus Platanista
Species Gangetica

Binomial Name

Platanista gangetica
Platanista gangetica gangetica
Platanista gangetica minor
wwf
wwf
dolphin information
Pakistan
indus dolphin
dolphin rescue
Nazir Mirani (c) helps rescue an indus dolphin stranded in shallow waters in the Indus River in Pakistan southern city of Sukkur. AFP PHOTO: Shahid ALI
stamp
post
Pakistan Post has also issued a set of 2 beautiful stamps on Indus Blind Dolphin in 1982.
dolphin

dolphin