Its enemies are frogs and fish.
nobody knows for sure what this spider eats exactly, but we know that its a meal itself.
Argyroneta Aquatica
Apparently they make good pets - "The waterspider is an easy housepet, and can be fed with a lot of freshwater animals". http://www.waterwereld.nu/waterspineng.phpI want one too god knows where you...
I'm pretty sure it's red and black.