Dolphins in The River and Dolphins in The Ocean

Have you ever saw river dolphins?

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As we know so far, most dolphins are friendly animals, perhaps because dolphins are types of intelligent animal. The size of dolphin's brain according to scientists is largest if compare with some species of whales (fin whale and sperm whale). There are some species of dolphins that lives in the river and some of them live in the ocean. Let’s take a look furthers the difference between dolphins that lives in the river and dolphins that lives in the ocean. But first, let find out about the types of dolphins and their habitat.

All dolphins, either river dolphins (dolphins that live in the river) or oceanic dolphins (dolphins that live in the ocean) are toothed whales. Both river dolphins and oceanic dolphins belong to sub-order odontocetes, the order of cetacean. Although dolphin's size usually smaller than other types of cetacean species such as humpback whales, some species of dolphins are quite large and can attain lengths over 20 feet.

There is species from the order of cetacean that have similarity with dolphin. The species is called porpoises. Porpoises are belonging to family Phocoenidae. The differences between dolphins and porpoises are dolphin have distinct beak while porpoises are not. Sizes of porpoises are smaller than any other oceanic dolphins. Some fishermen preferred to call porpoise for both dolphins and porpoises but some preferred to call dolphins to all type of dolphins and porpoises. Because some types of dolphins have large size, these large size dolphins even also called whales. For example, killer whale and orca. Porpoises and most various types of dolphins are more commonly found in the ocean. All porpoises habitat is in the ocean as well as certain type of dolphins and large size dolphins such as the killer whale. Porpoises and most various type of dolphins that live in the ocean called oceanic dolphins.

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The Blue Whale is The Largest Living Creatures on Earth

Yes, the blue whale is the largest living creatures on earth until now. The blue whale is the largest mammal ever recorded. The size of blue whale is average about 80 feet (25 meters)s long, with weigh about 120 tons or 109 tonnes. The size of blue whale is even bigger than dinosaurs that ever dominated the Earth.

There are 36 species of dolphins that has been found so far. Both, had habitat in the rivers and in the ocean. There are 32 oceanic dolphins and only 4 types of river dolphins ever found. Now let’s take a look at the difference between dolphins in the river (river dolphins) and dolphins in the Ocean (oceanic dolphins). Oceanic dolphins are belonging to super family Delphinoidea while river dolphins are belonging to super family Platanistoidea. River dolphins have poor eye sightings than oceanic dolphins because mostly they live in turbid water in the river. River dolphins are not active like oceanic dolphins and they have longer snouts than oceanic dolphins.

Type of dolphins in certain areas, either in the river or in the ocean depends on their environments such as food and temperature. The most common oceanic dolphins are Bottlenose Dolphin. We can recognize in Bottlenose Dolphin's shape because this type of dolphin is the common dolphins we often see, it can be in water parks, movies, sticker, or logo. It is because Bottlenose Dolphin is the type of dolphins that used to make a friend with human. Due to the largest scales of the ocean, oceanic dolphins like bottlenose dolphins can migrate, they usually migrate once every year. So they can live not only in one habitat like river dolphins but in certain places of the ocean. Because oceanic dolphins are the largest population on Earth, they have various types, not only Bottlenose Dolphins. Beside porpoises, there are certain species of whales are included in Dolphin’s family such as false killer whale, killer whale, long-finned pilot whales, short-finned pilot whales, pygmy killer whale and melon-headed whales.

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Which species of dolphins do you like?

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Unlike oceanic dolphins as mention above, there are only 4 types of river dolphins on earth. They live in 4 different rivers on the earth. Dolphins that lives in the river or freshwater, live in various types of rivers including in South America and Africa. The river dolphins that lives in the rivers are named like in the habitat where they live in the river; they are Indus River dolphin (Bhulan), Ganges River dolphin (Susu), Amazon River dolphins (Boto) and Chinese river dolphin (Baiji). However, there are some species of dolphins that can live both in the rivers and in the ocean. Because of that, these four types of river dolphins are called as true river dolphins. Some type of dolphins that can live in the rivers as well as in the ocean such as La Plata dolphins (Franciscana) that can be found in coastal Atlantic waters of southeastern South America and Tucuxi (Sotalia fluviatilis) that can also be found in the rivers of Amazon basins.

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Comments 12 comments

hawaiianodysseus profile image

hawaiianodysseus 3 years ago from Southeast Washington state

This was very interesting, Ryan, and one important thing I learned is that there IS a difference between porpoises and dolphins. Thank you for sharing!

Aloha!

Joe


Mhatter99 profile image

Mhatter99 3 years ago from San Francisco

Thank you for the research you put into this.


ryanjhoe profile image

ryanjhoe 3 years ago from Somewhere over the rainbow Author

Thank you for stopping by and read my hub. I'm glad this article is useful for you. I really appreciate it. :)


ryanjhoe profile image

ryanjhoe 3 years ago from Somewhere over the rainbow Author

Haha yes, I'm really doing research about this. Thanks for noticing that. :)


dilipchandra12 profile image

dilipchandra12 3 years ago from India

Beautiful and interesting hub on the friendly animal. Great work!


jcibme 3 years ago

Great article :)


ryanjhoe profile image

ryanjhoe 3 years ago from Somewhere over the rainbow Author

Thank you! :)


ryanjhoe profile image

ryanjhoe 3 years ago from Somewhere over the rainbow Author

Thank you for your compliment of this hub! I appreciate it. :)


shiningirisheyes profile image

shiningirisheyes 3 years ago from Upstate, New York

I commend you for providing us with a well-researched, informative and interesting hub. I am a fan of dolphins while my mother uses them as her life charm.

I have always known dolphins to be a gentle, kind and highly intelligent breed but was surprised to recently learn about rogue dolphins as well.


Ingenira profile image

Ingenira 3 years ago

Interesting to know there are river dolphins ! Thanks for the well-researched information. :)


ryanjhoe profile image

ryanjhoe 3 years ago from Somewhere over the rainbow Author

@shiningirisheyes Thank you for stopping by and yes, indeed, dolphins are intelligence mammals, which is why they are friendly to human as well. I also had a desire to write some rare species of dolphins. You gave me an idea about this. Good luck to you and thanks again! :)


ryanjhoe profile image

ryanjhoe 3 years ago from Somewhere over the rainbow Author

@Ingenira Yes, and thank you for stopping by and for the compliment as well. I really appreciate it. :)

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