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10 Biggest Fishes in the world

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The world’s oceans are home to a fascinating array of creatures, from the tiniest of plankton to the mighty giants that roam the deep waters. Among these giants, the largest fishes capture our imagination with their sheer size and presence. In this blog post, we will explore the top 10 biggest fishes in the world, uncovering their remarkable features and the awe-inspiring nature of these magnificent creatures.

10 Biggest Fishes in the World

1. Whale Shark

The whale shark, known as the largest fish in the world, is an awe-inspiring creature that roams the tropical and warm waters of the oceans. Despite its enormous size, reaching up to 40 feet in length, this gentle giant feeds on tiny plankton and small fish. Its distinctive pattern of spots and stripes, along with its wide mouth, creates a magnificent sight underwater.

Whale Shark

With a weight exceeding 20 tons, the whale shark’s presence commands respect and admiration from divers and marine enthusiasts fortunate enough to encounter it. Despite its colossal appearance, the whale shark poses no threat to humans, making it a symbol of grace and wonder in the underwater world.

2. Basking Shark

The basking shark, with its massive frame and impressive size, holds the title of the second-largest fish in the world. Growing up to 33 feet long, this filter-feeding giant inhabits the cooler waters of the Atlantic and Pacific oceans. Its most striking feature is its cavernous mouth, which can stretch wide open to filter large amounts of plankton and small fish.

Basking Shark

Despite its intimidating appearance, the basking shark is harmless to humans, preferring a peaceful and solitary existence. It spends much of its time near the water’s surface, hence its name, basking in the sunlight while skimming the water for its microscopic meals. Witnessing the sheer size and unique characteristics of the basking shark is an unforgettable experience, showcasing the wonders of the natural world.

3. Great White Shark

The great white shark, often feared and revered, is undeniably one of the most famous and formidable predators in the oceans. With its powerful build, sharp teeth, and sleek, torpedo-like body, this apex predator commands respect. Growing up to 20 feet in length, the great white shark is an efficient hunter, capable of reaching remarkable speeds as it ambushes its prey.

Great White Shark

While its reputation may evoke fear, human encounters with great white sharks are extremely rare, and they typically do not view humans as a food source. Instead, these magnificent creatures play a crucial role in maintaining the balance of marine ecosystems. The great white shark’s iconic status, showcased in popular culture, reflects its place as a powerful and captivating symbol of the oceans’ wild beauty.

4. Tiger Shark

The tiger shark, with its distinctive stripes and powerful presence, is a formidable predator found in tropical and subtropical waters around the world. Named after its unique markings resembling those of a tiger, this species can reach lengths of up to 16 feet. Known for its voracious appetite and opportunistic feeding habits, the tiger shark is often referred to as the “garbage can of the sea” due to its ability to consume a wide variety of prey, including fish, turtles, seals, and even other sharks.

Tiger Shark

Despite its reputation as a top predator, tiger sharks are not typically aggressive towards humans unless provoked. Their sleek and muscular bodies, combined with their sharp teeth, make them efficient hunters in their marine habitat. Observing a tiger shark in its natural environment is both thrilling and humbling, offering a glimpse into the power and beauty of the ocean’s apex predators.

5. Mekong Giant Catfish

The Mekong giant catfish, also known as the “king of freshwater fishes,” is an incredible species found in the rivers of Southeast Asia. Growing to astonishing lengths of over 10 feet and weighing up to 700 pounds, this behemoth is a true aquatic giant. The Mekong giant catfish is recognized for its massive size and distinct appearance, with a broad head and a scaleless body that ranges in color from gray to brown.

Mekong Giant Catfish

Sadly, this magnificent fish is critically endangered due to habitat destruction, overfishing, and dam construction. Efforts are being made to conserve and protect this species to ensure its survival in the wild. The Mekong giant catfish represents the importance of preserving the delicate balance of our freshwater ecosystems and serves as a poignant reminder of the threats facing many of our planet’s extraordinary species.

6. Beluga Sturgeon

The beluga sturgeon, an ancient and majestic fish, holds a special place in the world’s waters. Known for its enormous size and the valuable commodity it produces, beluga caviar, this species has faced significant challenges due to overfishing and habitat degradation. Growing up to 20 feet in length and weighing over 3,000 pounds, the beluga sturgeon is a true giant of the aquatic realm.

Beluga Sturgeon

Its elongated body, covered in tough scales, gives it a prehistoric appearance. Beluga sturgeons are primarily found in the Caspian Sea and Black Sea basins. Unfortunately, due to their slow growth and late maturity, these magnificent fish are highly vulnerable to exploitation. Conservation efforts and regulations are being implemented to protect the beluga sturgeon and preserve this iconic species for future generations. The beluga sturgeon serves as a reminder of the delicate balance between human consumption and the preservation of our natural wonders.

7. Ocean Sunfish (Mola Mola)

The ocean sunfish, also known as the Mola Mola, is a peculiar-looking fish that resides in the world’s temperate and tropical oceans. While it may not possess the same colossal length as some other large fishes, its unique shape and size make it a fascinating creature. The ocean sunfish holds the title for being the heaviest bony fish, weighing up to a whopping 2.5 tons.

Ocean Sunfish (Mola Mola)

Its distinct feature is its flattened body, which resembles a large floating disc, with its characteristic tall dorsal and anal fins extending from the top and bottom. Despite its size, the ocean sunfish feeds primarily on jellyfish, utilizing its specialized dentition to consume these gelatinous creatures. Encountering an ocean sunfish is a rare treat due to their elusive nature, and witnessing their enormous presence in the water is a testament to the diversity and wonder of marine life.

8. Giant Freshwater Stingray

The giant freshwater stingray is an impressive and enigmatic species that inhabits the rivers and estuaries of Southeast Asia. This massive ray holds the record for having the largest disc size of any ray, with some individuals reaching widths of up to 7.5 feet. Growing up to 16 feet in length and weighing over 1,300 pounds, the giant freshwater stingray is an imposing presence in its freshwater habitat.

Giant Freshwater Stingray

With its whip-like tail armed with a venomous stinger, this species should be approached with caution. Despite its potentially dangerous sting, the giant freshwater stingray is a shy and elusive creature, typically found buried in sandy or muddy riverbeds. Due to overfishing and habitat degradation, the populations of giant freshwater stingrays have suffered, highlighting the importance of conservation efforts to protect these magnificent creatures.

9. Arapaima

The arapaima, also known as the pirarucu, is a massive fish found in the rivers and lakes of the Amazon basin. Renowned as one of the largest freshwater fishes, the arapaima can grow up to lengths of 10 feet and weigh over 400 pounds. With its elongated body, powerful jaws, and bony scales, this species is well-adapted to its aquatic environment.


Arapaimas possess the ability to breathe atmospheric air, thanks to a modified swim bladder that functions as a primitive lung. This adaptation allows them to survive in oxygen-deprived waters and even venture into stagnant pools during the dry season. The arapaima is an important species both ecologically and culturally, playing a vital role in the Amazonian ecosystem and serving as a source of sustenance for local communities. However, unsustainable fishing practices and habitat destruction pose significant threats to their survival.

10. Greenland Shark

The Greenland shark, inhabiting the cold waters of the North Atlantic and Arctic Oceans, is a mysterious and intriguing creature. Known for its sluggish nature and slow metabolism, this shark grows at a remarkably slow pace, taking several decades to reach maturity. With a maximum recorded length of around 24 feet, the Greenland shark is one of the largest shark species in existence.

Greenland Shark

These sharks have a unique feature – their bodies contain a high concentration of urea and trimethylamine oxide, making their flesh toxic and unfit for human consumption. The Greenland shark’s diet consists of a variety of prey, including fish, seals, and even other sharks. Their deep-sea habitat and elusive behavior make them challenging to study, adding to the air of mystery surrounding this ancient species. The Greenland shark’s ability to thrive in extreme conditions serves as a testament to the resilience and adaptability of marine life.

Frequently Asked Questions

Are there any even larger fish than the ones mentioned in this blog post?

While the fishes listed in this blog post represent some of the largest known species, it’s important to note that new discoveries can always be made. The world’s oceans are vast and largely unexplored, so there may be additional species waiting to be documented and studied.

Are any of these large fishes endangered?

Yes, several of the fishes mentioned in this blog post are endangered or face conservation concerns. For example, the Mekong giant catfish, beluga sturgeon, and giant freshwater stingray are all critically endangered due to factors such as habitat loss, overfishing, and pollution. Efforts are being made to protect and conserve these species to ensure their survival.

Can I swim or dive with these large fishes?

Swimming or diving with large fishes like whale sharks and basking sharks is a popular activity in some regions. However, it’s essential to follow responsible ecotourism practices and respect the animals’ natural behavior. Ensure you are accompanied by trained guides who prioritize the well-being of marine life and adhere to sustainable tourism guidelines.

Are any of these large fishes dangerous to humans?

While some of the large fishes mentioned, such as great white sharks and tiger sharks, are apex predators, they do not typically view humans as prey. Incidents involving these sharks are extremely rare. However, it’s important to exercise caution and follow appropriate safety protocols when encountering any wild animal in its natural habitat.

What role do these large fishes play in their ecosystems?

Large fishes have significant ecological roles. They can regulate prey populations, maintain the balance of marine food webs, and contribute to nutrient cycling.


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  • Hey pet lovers ! I am Deepali H passionate pet lover and writer who enjoys sharing tips, facts and information about Pets .With 3 years of experience in the pet industry, I have a wealth of knowledge to offer readers. I hope you will like my articles. Thank you !

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