Bihar has emerged as the second-highest river dolphin habitat in India, holding nearly 35% of the country’s dolphin population. According to a report released by the National Board for Wildlife, Bihar has 2,220 dolphins — just 177 less than Uttar Pradesh, which tops the list with 2,397 dolphins.

The first-ever River Dolphin Population Estimation Report was published by the central government, covering 8 states and 28 rivers across 8,507 km of survey distance.

Top 5 States by Dolphin Population

  • Uttar Pradesh – 2,397
  • Bihar – 2,220
  • West Bengal – 815
  • Assam – 635
  • Jharkhand – 162

Why Bihar Is a Dolphin Haven

According to dolphin expert R.K. Sinha, the rivers in Bihar provide ideal water conditions and climate for dolphins to thrive. Unlike other states, Bihar’s rivers retain sufficient water, especially the Ganga, making them a natural sanctuary for river dolphins.

“Bihar is the most favorable state for dolphins,” said R.K. Sinha.
“However, dolphins in rivers like the Son have vanished due to water scarcity.”

Rivers in Bihar Where Dolphins Are Found

Dolphins are spotted in the following rivers:

  • Ganga
  • Gandak
  • Kosi
  • Mahananda
  • Kamla-Balan
  • Bagmati
  • Also found in small numbers in Punpun, Karmanasha, and Dhora

Previously, the Son River also had dolphins, but their population there has now dwindled to near extinction.

Ganga: The Dolphin’s Favorite Home

The Ganga River remains the most suitable habitat for dolphins. It supports a healthy aquatic ecosystem rich in:

  • Small fish
  • Aquatic plants
  • Balanced oxygen levels

Experts consider dolphins an indicator species — their presence means the river’s ecosystem is clean and well-balanced.

Did You Know?

  • India has only 6,327 river dolphins left
  • Bihar’s 6 rivers still host large dolphin populations
  • Dolphins were once most abundant in Bihar, and their numbers are now rising again
  • A healthy dolphin population means better river health for humans and aquatic life alike

FAQs

How many dolphins are there in Bihar?

There are 2,220 dolphins in Bihar, according to the national estimation report.

Which river in Bihar has the most dolphins?

The Ganga River hosts the majority of Bihar’s dolphin population.

What does a high dolphin count indicate?

It signals a healthy river ecosystem with clean water and rich biodiversity.

Why did dolphin numbers fall in some rivers?

Rivers like the Son have experienced declining water levels, making them uninhabitable for dolphins.

Which organization released the dolphin report?

The report was released by the National Board for Wildlife under the central government.