sturgeon is anadromus and so not a real freshwater fish. Since the wels catfish gets much longer and heavier than the Arapaima, the pima is out of the race as well.
World's largest freshwater fish.
- Thread starter M4ttSyke
- Start date
Well the world record white sturgeon is under 500 lbs anyway. The pima only reaches an estimated 300 lbs, the wels only reaches around 250. Largest Mekong giant catfish tipped the scales at 646 lbs, while the largest freshwater stingray weighed in at 772 lbs.
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It depends if you measure size or weight. With weight it is clearly the mekong catfish 
But by now Beluga Sturgeon are being kept in freshwater by fisheries.. Meaning they would count as freshwater. So in 20 years, when these sturgeon have grown bigger, this discussion will hopefully be history!
I know of a white sturgeon(they grow smaller than belugas) in Austria which is 10' 5". Thats already the size of a record pima.
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But by now Beluga Sturgeon are being kept in freshwater by fisheries.. Meaning they would count as freshwater. So in 20 years, when these sturgeon have grown bigger, this discussion will hopefully be history!
I know of a white sturgeon(they grow smaller than belugas) in Austria which is 10' 5". Thats already the size of a record pima.
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Mekong freshwater ray is the largest freshwater fish.
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I would consider the piraiba larger than the wels because they reach a greater mass, but Mekong probably gets bigger
It could also technically be a bull shark since they're able to survive in freshwater and grow to about 12'
