Looking for a little info about crabs

[BayouCowboy]

I have 150 gallon tank. I plan on putting local freshwater fish like crappie and large mouth bass. I would like to also put a few crabs, but I don't know what is the salt content the water must be for the fish and crabs to live together.

Can anyone help with this info?

Thanks
Mike

 

[GodFan]

There are freshwater crabs but they will be eaten lol