Largest Fish in the World: Everything You Need to Know

largest fish in the world

If you’re a fan of all things aquatic, then you’re probably interested in learning about the largest fish in the world. These magnificent creatures can be found in various bodies of water around the world, and they never cease to amaze us with their sheer size and power.

What is the Largest Fish in the World?

The world’s largest fish is the whale shark, which can grow up to 40 feet long and weigh as much as 20 tons. They’re not actually whales, but rather fish, and they’re known for their distinctive appearance, which includes a wide mouth and massive size.

Where Do Whale Sharks Live?

Whale sharks can be found in warm waters all across the globe, including places like the waters around Australia, the Caribbean Sea, and the Gulf of Mexico. They’re also found in the Indian and Pacific Oceans and have been known to travel as far north as Norway and as far south as New Zealand.

What Do Whale Sharks Eat?

Despite their massive size, whale sharks are filter feeders, which means that they mostly eat plankton, krill, and small fish. They’re also known to eat squid and sea jellies, but their diet mostly consists of small creatures that they suck into their giant mouths while swimming through the water.

Are Whale Sharks Endangered?

Despite their size, whale sharks are actually listed as “vulnerable” on the IUCN Red List of Threatened Species. This is due to a number of factors, including overfishing, habitat loss, and collisions with boats.

How Can We Protect Whale Sharks?

If you’re interested in helping to protect these amazing creatures, there are a few things you can do. One of the biggest things is to support organizations that work to protect marine life, such as the World Wildlife Fund or the Shark Trust. You can also reduce your own personal impact on the environment by using less plastic and using eco-friendly products whenever possible.

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Other Large Fish Species

While the whale shark is the largest fish in the world, there are plenty of other large fish species out there to discover. Here are a few other notable examples:

Giant Oceanic Manta Ray:

While not technically a fish, the giant oceanic manta ray is still an impressive sea creature, with a wingspan of up to 23 feet. They’re found in tropical waters around the globe and are known for their graceful movements through the water.

Beluga Sturgeon:

This massive fish, which can be found in the Caspian and Black Seas, can weigh up to 1,500 pounds and grow up to 20 feet long. They’re known for their prized caviar, which has led to overfishing and a decline in their population.


This freshwater fish can be found in the Amazon River and can grow up to 10 feet long and weigh as much as 400 pounds. They’re known for their unique ability to breathe air, which allows them to gulp in oxygen from the surface of the water.

Ocean Sunfish:

The ocean sunfish, also known as the Mola mola, is a bizarre-looking fish that can grow up to 10 feet long and weigh as much as 5,000 pounds. They’re found in open waters around the world and are known for their round, disc-like shape.


The largest fish in the world, the whale shark, is truly a marvel of nature. While there are plenty of other large fish species out there to discover, the whale shark’s massive size and gentle nature make it a true standout. By supporting efforts to protect these incredible creatures, we can help ensure that they continue to thrive for generations to come.

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