Can fish breathe in zero gravity? Does it affect their swim bladders?

Also, could a fish survive in deep space if it had a big bolus of water to swim around in?

NASA has studied fish in space on many occasions so apprently they can survive just fine. In order to breathe, a fish just needs to be in water that is sufficiently saturated with oxygen. A swim bladder would be mostly useless in space because there is no such thing as bouyancy in the absence of gravity. A fish in deep space that was not on board a space craft of some kind would probably not survive very long even if it had a large ball of water to swim in. First, the water would probably vaporize or freeze; and second, the fish would be exposed to large amounts of deadly radiation from the sun without the protective shielding found on a man-made craft.