Is there such a thing as a freshwater grouper? 10 points for first answer!?

Question

I want to put a freshwater grouper with my silver arowana

Answer 1

Bumble Bee Grouper.

Answer 2

I was looking it up and there are brackish groupers, but they grow big!

*Edit* - I found this nifty video if you want to see what a bumblebee grouper looks like :) http://www.youtube.com/watch?v=_BWfljD-x...

They are actually ocean dwellers but like salmon, swim up stream into rivers to feed or breed... They are quite interesting little creatures too...

Answer 3

I couldn't find any FW groupers on the sites I checked, including the monsterfish one. So I'd have to say no.  There's a lot of good info on the following sites about bumblebee groupers.  Although they can be kept in FW for a while, as they grow they need to be put in a marine tank.  They aren't naturally FW, but brackish water for juveniles.  Groupers are not recommended for home aquaria due to their large size (over 8', 1000 lbs.) and voracious appetite, even eating fish the same size they are.

"Epinephelus lanceolatus is sometimes sold as a freshwater species or claimed to be a “marine species adapted to freshwater”.  This is very far from the truth since the Bumblebee grouper is a marine fish living in the ocean. It is however capable of handling brackish conditions and can therefore venture into estuaries and similar. Young specimens are more adaptable than old ones and can even survive in freshwater for a while. Purchasing a Bumblebee grouper for your freshwater aquarium is not recommended. The older your fish becomes, the harder it will be for it to cope with not being in marine conditions. There are aquarium keepers that have kept bumble bee groupers successfully in freshwater for several years but this is not recommended and they will eventually need to be moved to saltwater environment.

If you want to keep a Bumblebee grouper, you must provide it with an aquarium that mimics its natural habitat in the ocean. If possible, give your grouper a suitably sized cave or similar where it can live, just as it would in the wild.  

The Bumblebee grouper will not harm corals in the aquarium, but it will eat any fish small enough to defeat. This includes fishes of the same size as the grouper. The Bumblebee grouper is also fond of eating crustaceans."