Scienceray > Biology > Marine Biology

Monster Leviathans: The Planet’s Largest Freshwater Fish That You Probably Didn’t Know About

Obviously the world’s oceans are known to support the majority of the planet’s fish species, but did you know that there are monsters patrolling the world’s fresh waters that are as big as the cars that we drive or can swallow a person whole if they were hungry enough?

When considering day fishing at our favorite fishing holes, generally we catch fish not bigger than 60 to 75 pounds on a rod and reel. Larger fish are always possible using a trotline or net in deeper water or along river channels. Usually, the majority of us catch hand size bluegill bream, slab crappie, largemouth bass, carp, or catfish (best chance to catch a large fish).

In the United States of America, there are some pretty large freshwater fish lurking the deeps of thousands of miles of rivers, deep lakes, ghostly swamps and the endless tributaries that are the life support of healthy rivers. There are bigger and more formidable freshwater fish prowling the freshwater basins in the more remote parts of the world. Monstrous fish, so huge that some of them are as big as the cars that we drive and others so aggressive that they could possibility swallow a man whole, if they were hungry enough.

Let's take a look together at the Monster Leviathans: “The Planet's Largest Freshwater Fish That You Probably Didn't Know About” and thank our lucky stars that we haven't come face-to-face with one of these monsters at our favorite fishing or swimming hole.

Arapaima


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The Arapaima (as known as the “Paiche”) is one of the largest freshwater fish in the world reaching lengths up to 14 ¾ feet and weighing as much as 440 lbs. A native fish to the Amazon, these fish are commonly raised in commercial farm ponds, because of its delicious meat and protein many poor rural regions of the Amazon can easily obtain.

Mekong Giant Catfish


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The Mekong Giant Catfish is considered the most endangered fish in Southeast Asia and in a last ditch attempt to save the fish from complete extinction, the World Conservation Union has classified the Mekong Giant Catfish as critically endangered making it a crime to harvest. The Mekong Giant Catfish can grow to more than 660 pounds in the Cambodian Mekong River Basin and grow to lengths as big as a Volkswagen.

Giant White Sturgeon


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The Giant White Sturgeon is a freshwater prehistoric looking fish with sweet meat that is considered to be a delicacy in many parts of the world. Found mainly in the Yangtze River in China, the Giant While Sturgeon can reach lengths of exceeding 12 feet and weigh more than 950 pounds. There have been some documented cases in which Giant White Sturgeons have been caught by sports fishermen weighing in at more than 1,100 pounds and nearing 16 feet in length.

Chinese Paddlefish


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The Chinese Paddlefish are considered one of the planet's largest freshwater fish, which are found in the Yangtze River in China. These fish are quickly disappearing and quiet frankly, the scientists are scratching their heads as to the reason why, but commercial fishing and pollution are two possible reasons as to why. The Chinese Paddlefish can grow to more than 1000 lbs and reach lengths of 23-feet or greater. Everything is bigger in China.

Giant Stingray


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The Giant Stingray found mostly in the river basins of Cambodia and China, but are found in other freshwaters throughout Asia, can grow up to 5 meters (16.4 feet) in length and weigh as much as 1,100 lbs. Just like with other stingray species, the Giant Stingray has a sharp, deadly spear-like barb at the tip of its tail that can be used to defend itself with a potentially deadly outcome.

Bull Shark


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The Bull Shark is considered to be one of the most dangerous sharks in the world, because it can survive both in the salt waters of the oceans and the brackish and freshwaters of inland rivers and tributaries. The Bull Shark can grow to 500 lbs and reach lengths of nearly 12 feet. They have been known to attack and kill humans. This type of shark is found in the Ganges River basin of India, the Mississippi River Basin in North America, the Amazon River in Peru, and in Lake Nicaragua in Central America.

Northern River Shark (Glyphis sp. C.)


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The Northern River Shark is only known to inhabit the Adelaide and Alligator River systems in the Northern Territory of Australia, but the numbers are apparently on the decline due to heavy fishing and environmental toxins. The Northern River Shark can reach 2 to 3 meters in length and have rows razor-sharp teeth, just like its saltwater cousins.

Alligator Gar


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The Alligator Gar can reach weights up to 300 pounds and are commonly found long the Mississippi River basin of North America, but can be found in lakes and other rivers that connect with the Mississippi River. The larger fish can grow to lengths greater than six-foot and there have been reported attacks on humans, but most are believed to have been accidental attacks as the fish probably mistaken hands and feet as food. Alligator Gar have razor-sharp needle-like teeth filling the short snout and armor-like scales covering its body.

Blue Catfish


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The Blue Catfish is closely related to the channel catfish and are found in rivers and reservoirs throughout North America, northern Guatemala east of the Appalachians. These fish have been documented to grow up to 150 pounds, but some legends exist that the Blue Catfish can reach weighs up to 350 pounds, but there hasn't ever been a Blue Catfish scientifically documented in that size category.

Giant Carp


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The Giant Carp often harvested for its meat, which is considered to be a delicacy throughout Asia can reach weighs up to 660 pounds and easily achieve lengths of 6 ½ feet.

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Comments (30)
#1 by R J Evans, Aug 17, 2008
Hey Nelson!

Cool article. I used to go fishing with my father and brother and would run amile if anything longer than the length of my forearm was pulled out of the water. What I would do with the sight of these babies coming at me I have no idea! Very informative! Cheers!
#2 by Timberland, Aug 17, 2008
Those are some very big fish. I only was aware of maybe 2 or 3 of them before reading this piece and they seems to be the tame ones on this list. Although, I would really have a blast trying to land a 660 pound catfish that would be cool.
#3 by Leo Reyes, Aug 17, 2008
very informative. i did'nt know that freshwater fish would grow so big, even bigger than those found in the deep of the ocean.
#4 by Lauren Axelrod, Aug 17, 2008
Wow. Very cool article. You should check out my monster Goliath on amazing creatures. Well researched.
#5 by Ruby Hawk, Aug 17, 2008
My son and I had a catfish swim along with our boat that was almost as long as the boat at Sloppy Floyd lake near Summerville Ga. It was amazing.
#6 by nobert soloria bermosa, Aug 17, 2008
another nice article,those are really huge fishes,thanks Nelson
#7 by Neverty Agisti, Aug 18, 2008
Great!! I don't know the fish are great or your article is great!!
Good Job!
#8 by Jace Matthews, Aug 19, 2008
It's so nifty to see the size some of these things can get to be, bit scary though. We sell alligator gar at the pet store I work in. The African tiger characin is another one that gets close to 6 feet. We sell those too.
#9 by boo, Aug 19, 2008
i hate seeing these monsters caught. they should be left alone as they are truly natural marvels.
#10 by s hayes, Aug 19, 2008
These are monsters - Great article
#11 by Unofre Pili, Aug 19, 2008
I learned. Thank you.
#12 by Sean Durham, Aug 19, 2008
really informative article. I didn't know half of this stuff and I'm not going swimming down in those rivers!
#13 by Rachel Faye, Aug 19, 2008
I love this article, thanks.
#14 by Blue, Aug 19, 2008
Clearly Photoshopped.
The shadows are all wrong. I've seen a lot of 'shops in my time, and i can clearly see this isn't real.
You people are so ignorant for falling for this blatant fake.
#15 by The Dentist, Aug 19, 2008
That's why I am afraid of lakes right there. Through in a pic of a big ass turtle and I am staying on land forever
#16 by Matt McG, Aug 19, 2008
Magikarp!!!
#17 by Henrietta, Aug 20, 2008
Blue: seriously? These fish are in scientific journals.... and encyclopedias.

Hint: get an education and stop wasting your time telling everyone

\"TOTALLY FAKE< LIKE OMG LOLCOPTRS PH0T0SH0P, VIsIt mY Pr0n site.\"

get a lifeeeee
#18 by Kristi, Aug 20, 2008
Thank you for posting this... amazing pictures! The arapaima picture took my breath away. I am pretty sure I would have a heart attack if I ever encountered one of these monsters while in the water.

I agree with Henrietta.. People who go around shouting "fake, fake" are truly missing out on some wonderful things in life, such as this article.

Well done.
#19 by Verniel Cutar, Aug 20, 2008
I don't need to know if they're fake. I enjoyed this article. :-)

(films and TV shows portray fake stories, so what the heck)
#20 by Elle Millay (Leslie), Aug 20, 2008
Great Article!
I don't fish but I have always had an interest in Marine Biology.
You should contact the Imageing Foundation - perhaps write some articles for them - they're a great foundation that is focused on saving our oceans, lakes, rivers,etc.. The founders name is Georgienne.

Leslie Thompson (Elle Millay)
#21 by Mary Contrary, Aug 20, 2008
I can definitely vouch for the aligator gars! We have them here and they get as long are longer than I am tall. I am 5'5". Great article!
#22 by Kalista Leow, Aug 20, 2008
Fascinating article and well informative too. Good job!
#23 by dawn haynes-grimes, Aug 21, 2008
This article is amazing and very informative.(the fish look delicious too)
#24 by jill, Aug 21, 2008
Everything is not photoshopped. If that was true, nobody would have allowed you to remain, Blue. Background eraser and a supermodel cut and pasted into your spot, that's what'd happen to you.
#25 by dan, Aug 26, 2008
the fishes mentioned in this post do get that big and
i have seen most of em.

the pics may have been tweked, not sure, but anyway there are
these creatures which grow these sizes.

see it to believe and then make a comment or
just shut and enjoy the post.
#26 by fuzzyalien001, Oct 9, 2008
any of you that doubt these fish have the potential to grow to these massive sizes should check in any archive in their library and while your at it check on the sizes of snakes. you will be amazed.
#27 by ninjastar, Oct 26, 2008
wow thats so cool me and my dad caught this fish and it was longer than my arm and i thought that was big now that i see these i soooo want to go see them in real life
#28 by RAPTORsores, Nov 13, 2008
well..that amaze me much..did not think those giant fish really can survive our poluted water now...wow.....i catch many big fish in my entire life....but never so big like that....
#29 by gryfkat, Nov 17, 2008
blue has no clue. This has been documented for many years before photoshopping came into existence. I\'ve lived in the Far East, the sting ray looks as big as a VW if it comes near a boat. There are also other Asian fish almost as big. Down in the Mekong Delta some of them look like pickup trucks. One fish would feed a village for a month if they dried the flesh. I\'ve seen fishing boats being towed around for hours by one giant fish before it was tired enough to get to the shore.
#30 by Anon a Moose, Nov 18, 2008
Anyone who is interested in fish or ichthyology knows all of the fish mentioned above. Yawn.
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