About dolphins you can meet in the Hayasaki Strait

Go on a boat to meet wild dolphins. It will surely be a special time. In order to make you feel closer to dolphins, I would like to introduce you to some of them.

Types of dolphins

Minami bottlenose Dolphin

Kinds that you can meet with high probability throughout the year

English name Indopacific bottlenose dolphin
Scientific name Tursiops aduncus
Classification Mammalia-Cetartiodactyla-Cetartiodactyla-Delphinoidea-Bottlenose dolphin
Maximum body length 2.6m
Maximum weight 240kg
Habitat Temperate to tropical coastal areas of the Indian Ocean and Western Pacific
feature Curious and friendly personality.
As you grow up, you will see black spots on your abdomen.


If you are lucky you may meet

English name Finless porpoise
Scientific name Neophocaena phocaenoides
Classification Mammals-Cetartiodactyla-Cetartiodactyla-Delphinoidea-Porpoises Indo-Pacific
Maximum body length 1.8m(There seems to be a difference depending on the region)
Maximum weight 50~60kg
distribution Coastal waters from the Middle East to Asia
feature The whole body is light gray, the head is round and the beak, and there is no dorsal fin.
In this area, it is also called "Naminouo".

Dolphin's body

Dolphins who are the same mammals as us but have chosen to live in the ocean. Introducing their mystery of the body.

Body shape

Body shape

The bodies of dolphins living in the water are streamlined to reduce water resistance. It is said that the skin of dolphins is smooth and has excellent elasticity, and even if water flows on the surface, the skin bends according to the flow, making it difficult for vortexes to form and the resistance of water is low.



The hole above the head is the nose of the dolphins and is called the "fumarole". This fumarole is closed when underwater and opens when it rises to the surface of the sea to breathe. Dolphins living in the water need to breathe efficiently. It is said that most of the air in the lungs can be replaced with a single breath. By the way, regarding the sense of smell, it seems that the olfactory nerve that smells degenerates in the process of evolution and is hardly functioning.



The eyes of dolphins living in the sea are slightly sideways to prevent water from entering when swimming. The dolphin's eyes are protected by mucous membranes, so you can open your eyes and swim in the water. By the way, the visual acuity of dolphins is said to be about 0.1 when compared to our human vision test.



The number of teeth depends on the type. The Minami bottlenose dolphin has about 80 teeth. The teeth of dolphins do not grind food, but mainly to catch prey and prevent it from escaping, and to protect themselves. Also, unlike us, we do not regenerate and spend the rest of our lives with the same teeth.

3 fins


The dolphins have three fins, each with its own role. The dorsal fin stabilizes your posture when you swim. The pectoral fin has the role of steering and braking. The tail fin is the driving force for swimming. The tail fin and back fin are made only of muscles, and the chest fin is characterized by bones.

Ringing sound


There are three main sounds of dolphins. The "whistle" used to communicate, the "clicks" used to grasp the position and size of things, and the "perst pulse" dolphins that make when intimidating or angry seem to use different sounds depending on the situation. am.

Dolphin behavior

Free-spirited wild dolphins show us various behaviors. Here are some of their behaviors that we were able to observe during dolphin watching.



Curious dolphins seem to like playing in the waves. When the waves are high, you can observe them surfing like a surfer.
You may also get on the waves and trailing waves that form on the bow of the ship.
Riding the waves on the bow is called "bow ride", and it seems that dolphins can swim comfortably without using much energy by riding the waves of the ship.



You may be able to observe a large yellowtail or tie that sticks out of your mouth. By the way, when you eat food, you eat it as a whole. Dolphins also rehydrate from food.

Spy hop

Spy hop

The act of sticking out your face from the surface of the sea and looking around is called "spy hop". Dolphins are said to have poor eyesight, but they seem to be able to visually check the surrounding conditions.



Wild dolphins sleep while swimming. When the left eye is closed, the right brain is rested, and when the right eye is closed, the left brain is rested.
Mammals, dolphins, need to breathe regularly. It is also believed to sleep this way to protect themselves from the enemy.



Dolphins jump for various reasons, such as playing, appealing to the opposite sex, and removing parasites and red worms on their bodies.
By the way, it is said that you can swim faster by removing the red on your body. Dolphins usually swim at a speed of 15km / h, but when they "escape from their enemies" or "chase their prey", they accelerate to a top speed of 40km.



Playful dolphins sometimes catch seaweed with their fins and play. Sometimes it shows a lively appearance by holding it in the mouth and throwing it.

Parenting dolphins

Because dolphins have settled in the Hayasaki Strait You can observe the growth process of dolphins.

Birth of a baby

Birth of a baby

Dolphins living in the water have to swim by themselves immediately after they are born. Mothers and adult dolphins around them will support swimming by snuggling up to babies who are not good at swimming yet.

Fetal wrinkles

Fetal wrinkles

From early spring to summer is the season for dolphins to give birth. The body of a newborn baby dolphin has a striped line called "fetal wrinkle". This is the line of remnants of when I was in my mother's stomach.



Mammal dolphins grow up on their mother's milk when they are babies. The dolphin's boobs are attached to the back of the body and are usually stored in a groove called a milk groove. When the baby pokes around the cleavage and stimulates it, the nipple comes out and you can drink milk.

Dolphins of the same age

Dolphins of the same age

By the time the swim begins to stabilize, you may see baby dolphins playing with each other.

Until you grow up

Until you grow up

I will grow up while being protected near my mother for about 3 years. Females are about 6 to 7 years old, and males are about 10 years old and mature and join the ranks of adults.

Protect in a flock

Protect in a flock

The dolphins protect and raise their babies in a flock while working together. The Hayasaki Strait is a very important environment for dolphins to nurture their lives. In order to keep the life of dolphins living strong. Don't forget to be considerate so as not to stress the dolphins.


Photo collection


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