I know you're proud of that fish...death sucks

is it illegal to have p bass in Oz? or the laws are just so strict it is hard to get fish into the country? What causes "swim bladder infection or disease?" Is there some kind of treatment? I know when I went fishing, if a fish has the bloated swim bladder, we just use a syringe needle to let the air out of the bladder and release the fish, and it's fine. Is it the same thing?