The world's largest fish is the whale shark， It belongs to the elasmobranch subclass and holds the title of the largest known fish species. The whale shark can reach an impressive body length of over 20 meters, with an average length ranging from 9 to 14 meters.

In terms of weight, these majestic creatures can exceed 20 tons.

Let's delve into a detailed description of the ten largest fish species in the world:

1. Whale Shark :

The whale shark is not only the largest fish species but also the largest known fish overall. Growing up to a staggering length of over 20 meters and weighing over 20 tons, these gentle giants inhabit warm oceans.

Their diet consists of plankton and they employ filter feeding by utilizing their enormous mouths to extract food from seawater.

2. Sunfish :

The sunfish also referred to as the Mola mola, holds the distinction of being the heaviest bony fish in the world. Growing up to 3 meters in length and weighing up to 2.3 tons, the sunfish possesses a unique flattened and round body shape.

Often found near the ocean surface, they feed on jellyfish, hydra, and other planktonic organisms.

3. Albacore Tuna :

The albacore tuna is a large fish species that can reach lengths of over 3 meters and weigh up to 600 kilograms. These pelagic fish are known for their migrations in warm oceans. Albacore tuna are formidable predators, preying on smaller fish, and are renowned for their high-speed swimming and acute senses.

4. Atlantic Great White Shark :

The Atlantic Great White Shark is one of the world's most famous and largest predatory fish. Grownup specimens can grow between 6 to 8 meters in length and weigh up to 2 tons.

They have a wide distribution and prefer warm oceans for hunting. As apex predators, they prey on seals, sea lions, and various other marine creatures.

5. Arapaima :

The arapaima, also known as the "imperial tongue fish," is an incredibly long fish species, capable of reaching lengths of 11 meters. Their elongated bodies with distinctive bands resemble giant belts. Arapaimas primarily inhabit deep-sea environments and feed on plankton.

6. Anglerfish:

Anglerfish are large fish that can grow up to 1.5 meters long and weigh up to 20 kilograms. They are found in tropical and subtropical seas worldwide. These aggressive fish primarily feed on other fish and crustaceans.

7. Damselfish :

The damselfish, also known as the gigantic damselfish, is a colossal fish species that can grow up to 2.7 meters in length and weigh up to 400 kilograms. They are predominantly found in the warm waters of the southern hemisphere. Damselfish are apex predators, feeding on fish, crustaceans, and mollusks.

8. Antarctic Cod :

The Antarctic cod is a massive deep-sea fish, reaching lengths of up to 2.2 meters and weighing up to 200 kilograms. They primarily inhabit Antarctic waters and thrive in cold environments. Antarctic cod are carnivorous, preying on other fish and invertebrates.

9. Green Giant Whale Shark :

The green giant whale shark, also known as the Florida shark, is a large shark species that can grow to be 9 to 14 meters long and weigh up to 12 tons. They are mainly found in warm oceans and feed on plankton. The green giant whale shark is a gentle species and poses no threat to humans.

10. Bigfin Grouper :

The bigfin grouper is a sizable reef fish that can grow up to 3 meters long and weigh up to 400 kilograms. They inhabit coral reefs in tropical and subtropical seas. Bigfin groupers are carnivorous and feed on other fish and crustaceans.

These ten remarkable fish species represent the pinnacle of size and ecological significance in the underwater world. Whether it's their immense proportions or their predatory behaviors, they showcase the captivating diversity and enchantment of marine life.