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Species Directory

Indus River Dolphin

Overview Conservation & Management Resources
The Indus River dolphin, also known as the “bhulan,” is one of the world’s most endangered cetaceans. They are closely related to the Ganges River dolphin, also known as the “susu.” Learn more about the Indus River dolphin species.

Indus River Dolphin

Platanista gangetica minor

Indus River dolphin illustration. Credit: Jack Hornady

Protected Status

ESA Endangered - Foreign
Throughout Its Range
MMPA Protected
Throughout Its Range
MMPA Depleted
Throughout Its Range
CITES Appendix II
Throughout Its Range

Quick Facts

Weight
150 to 200 pounds
Length
7 to 8.5 feet
Lifespan
About 30 years
Threats
Chemical contaminants, Entanglement, Habitat degradation, Noise, Vessel strikes
Region
Foreign

About the Species

The Indus River dolphin, also known as the “bhulan,” is one of the world’s most endangered cetaceans. They are closely related to the Ganges River dolphin, also known as the “susu.” Their eyes are so small that scientists believe they are functionally blind, sensing only the levels and direction of light.

 

The main threats to the Indus River dolphin include entanglement, habitat degradation, noise, chemical contaminants, and vessel strikes. In 1991, NOAA Fisheries listed the Indus River dolphin as endangered under the Endangered Species Act.

Appearance

The Indus River dolphin is 7 to 8.5 feet long and weighs 150 to 200 pounds. Females are slightly larger than males. All Indus River dolphins have a rounded, stocky body with a small triangular fin located far down their back. Like other cetaceans, they have a distinctive "melon" on their head. This “melon” is a rounded forehead that collects sounds from the environment.

The Indus River dolphin’s back is gray and its belly is pale white or pinkish. Its small, poorly-developed eyes are located above the corners of the mouth.

Behavior and Diet

Indus River dolphins produce sound almost constantly to navigate, communicate, and find food. They make a sound similar to a sneeze when surfacing to breathe. These dolphins are usually found individually or in pairs but have been seen in groups of up to 10. They often swim on their side and rarely approach boats.

Indus River dolphins usually dive for 30 to 90 seconds but are able to hold their breath for several minutes. They use their long beaks to find food along the river bottom and groups of dolphins sometimes work together to find prey. Their fang-like teeth help them eat clams, fish, and shrimp.

Where They Live

Historically, the Indus River dolphin occurred from the Indus River delta to the shallow foothills of the Himalayas. It was also found in the tributaries of the Indus River. Today, its range is limited to the lower and middle areas of the Indus River in south-central Pakistan. This area represents only 20 percent of its historic range.

Indus River dolphins only occur in freshwater. They usually prefer shallow, murky waters, but are sometimes found in the main channels of rivers and tributaries during the flood season.

Indus river dolphin range map World map providing approximate representation of the Indus River dolphin's range.

Lifespan & Reproduction

Indus River dolphins can live for about 30 years. They reach sexual maturity when they are 6 to 10 years old. Adults breed throughout the year and females give birth to a single calf. Mothers nurse their calves for about one year.

Threats

Entanglement

One of the main threats to Indus River dolphins is getting entangled or caught in fishing gear, including gillnets and longlines. Indus River dolphins are accidentally captured in fishing gear mainly in the side channels and adjacent pools along the Indus River where fishing activity is greater due to higher densities of fish.

Habitat Degradation

Indus River dolphins are susceptible to habitat degradation and destruction. Human activities such as dredging and water withdrawals can damage Indus River dolphin habitats. Dams and irrigation canals also prevent Indus River dolphins from moving upstream and can separate populations from one another.

Ocean Noise

Underwater noise pollution interrupts the normal behavior of Indus River dolphins that rely on sound to communicate and echolocate. Noise interference from vessels, as well as industrial activities, disturbs Indus River dolphins’ feeding, communication, and orientation. If loud enough, noise can cause permanent or temporary hearing loss.

Chemical Contaminants

Contaminants enter the Indus River from many sources, such as wastewater discharges, agriculture, and other industrial processes. Indus River dolphins can accumulate chemicals in their bodies because of their long lifespan and position near the top of the food chain. These pollutants can harm river dolphins’ immune and reproductive systems. Chemicals can also kill fish, which reduces the amount of prey available for Indus River dolphins.

Vessel Strikes

Inadvertent vessel strikes can injure or kill Indus River dolphins. These dolphins are vulnerable to vessel collisions throughout their range, but the risk is much higher in some areas with heavy vessel traffic.

Scientific Classification

Kingdom Animalia
Phylum Chordata
Class Mammalia
Order Cetacea
Family Platanistidae
Genus Platanista
Species gangetica minor

Last updated by NOAA Fisheries on 01/16/2025


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Management Overview

The Indus River dolphin is listed as endangered under the Endangered Species Act.

The Indus River dolphin is protected throughout its range under the Marine Mammal Protection Act.

The Indus River dolphin is depleted under the Marine Mammal Protection Act.

Additionally, the Indus River dolphin is listed under:

  • Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) 

Regulatory History

In 1991, the Indus River dolphin was listed as endangered under the Endangered Species Act.

Key Actions and Documents

Actions & Documents

5-Year Review for the Endangered Indus River Dolphin

We are required by the Endangered Species Act to conduct 5-year reviews of all listed species. The 5-year review must be based on the best scientific and commercial data available at the time of the review. We previously requested submission of any such…
  • Notice of Initiation of 5-year review; request for information (89 FR 70172, 08…
  • Notice of Initiation (81 FR 8923, February 23, 2016)
  • 2024 Indus River Dolphin 5-year Review
  • 2016 Indus River Dolphin 5-year Review
Notice,
Foreign
Published
November 12, 2024

Listing of the Indus River Dolphin as an Endangered Species

The Service is adding the Indus River dolphin (Platonista minor) to the List of Endangered and Threatened Wildlife. This measure, required by section 4(a)(b) of the Endangered Species Act of 1973 corresponds with the final determination of endangered…
  • Final Rule (50 CFR Part 17, 01/14/1991) (PDF, 156 pages)
  • Proposed Rule (50 CFR Part 222, 11/09/1989) (PDF, 132 pages)
Final Rule,
Foreign
Effective
January 14, 1991

Last updated by NOAA Fisheries on 01/16/2025

Documents

Document

Indus River Dolphin 5-Year Review (2024)

This document is the ESA 5-year review of the species based on the best available data.

International
Document

2016 Indus River Dolphin (Platanista gangetica minor) 5-Year Review: Summary and Evaluation

This 5-year review is a periodic analysis of the Indus River dolphin's status and ensure the…

International
More Documents

Last updated by NOAA Fisheries on 01/16/2025

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