The Indo-Pacific Humpback Dolphin (Sousa chinensis) is a marine mammal that inhabits the warm coastal waters of the Indian and western Pacific Oceans. Adults can appear white, pale gray, or even pink, and some populations are particularly famous for their striking pink coloration. These dolphins usually live in shallow coastal waters and estuaries, where they feed mainly on fish, squid, and other marine animals.

In this article, we’ll explore the characteristics, habitat, behavior, diet, reproduction, and ecological importance of the Indo-Pacific Humpback Dolphin.

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What Is the Indo-Pacific Humpback Dolphin?

The Indo-Pacific Humpback Dolphin belongs to the family Delphinidae and the genus Sousa.

Its scientific name is Sousa chinensis, and it is commonly known in English as the Indo-Pacific Humpback Dolphin.

It is primarily found in coastal waters around southern China, Hong Kong, Southeast Asia, and parts of the Indian Ocean region.

Adult dolphins typically measure:

• Body Length: Approximately 2–2.8 meters (6.6–9.2 feet)
• Weight: Approximately 150–250 kg (330–550 lb)
• Lifespan: Around 30–40 years or more

Body size and coloration can vary depending on the individual and geographic population.

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Characteristics of the Indo-Pacific Humpback Dolphin

1. White or Pinkish Body

One of the most distinctive features of this dolphin is its unusual body coloration.

Young dolphins are generally darker gray, but their bodies gradually become lighter as they mature. Some adults may appear almost white, while others develop a beautiful pink coloration.

The dolphins found around Hong Kong are especially famous for their pink appearance and are sometimes called “pink dolphins.”

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2. Distinctive Hump on the Back

As its name suggests, the humpback dolphin has a slightly raised area around the dorsal fin that can create a hump-like appearance.

It has a relatively robust body, a long beak, and a rounded forehead.

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3. Excellent Echolocation Ability

Like other dolphins, the Indo-Pacific Humpback Dolphin uses echolocation to understand its surroundings.

It produces sounds and analyzes the echoes that return after bouncing off objects or prey.

This ability allows the dolphin to locate food effectively even in murky coastal waters and estuaries where visibility is limited.

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Behavior

The Indo-Pacific Humpback Dolphin is a social marine mammal that is often observed interacting with other members of its species.

Typical behaviors include:

• Living in small groups
• Preferring shallow coastal waters
• Frequently entering estuaries
• Using echolocation to locate prey
• Communicating through various sounds
• Providing extended care for calves

When food is abundant, several dolphins may gather together to hunt.

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Diet and Habitat

The Indo-Pacific Humpback Dolphin is carnivorous.

Its main food sources include:

• Small fish
• Mullets
• Croakers
• Squid
• Crustaceans

Its preferred habitats include:

• Tropical and subtropical coastal waters
• Shallow seas
• Estuaries
• Bays
• Waters near mangrove forests

It generally prefers shallow coastal environments where prey is abundant.

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Reproduction and Calves

Female Indo-Pacific Humpback Dolphins generally give birth to one calf at a time.

After birth, the calf depends on its mother’s milk and protection while gradually learning essential survival skills such as swimming, social behavior, and finding food.

Like many dolphin species, mothers provide extended parental care, resulting in a strong bond between mother and calf.

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Ecological Importance

The Indo-Pacific Humpback Dolphin is an important upper-level predator in coastal marine ecosystems.

By feeding on fish, squid, and other marine organisms, it helps regulate prey populations and contributes to maintaining a balanced coastal food web.

Because these dolphins are sensitive to changes in coastal environments, their population size and health can also provide valuable information about the condition of local marine ecosystems.

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Relationship with Humans

The Indo-Pacific Humpback Dolphin attracts considerable attention from researchers, conservationists, and wildlife tourists because of its unusual coloration and charismatic appearance.

However, because it lives close to heavily populated coastlines, it is particularly vulnerable to human activities.

Major threats include:

• Coastal development
• Marine pollution
• Increased vessel traffic
• Underwater noise
• Accidental entanglement in fishing gear
• Habitat loss and degradation

Protecting important coastal habitats is therefore essential for the long-term survival of this species.

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The Indo-Pacific Humpback Dolphin is a remarkable marine mammal known for its distinctive white or pink coloration. Living primarily in the warm coastal waters of the Indian and western Pacific Oceans, it possesses excellent echolocation abilities, complex social behavior, and an important ecological role as a coastal predator.

However, its preference for coastal habitats also places it in close contact with human activities. Protecting clean marine environments, reducing pollution and disturbance, and conserving important coastal habitats will be essential to ensure that these beautiful dolphins continue to thrive in the wild for generations to come.