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Originally Posted by DustyPorViva

Move is a preexisting function :P Try renaming it.

Also, you can just do something like this:

PHP Code:

function MoveFish() {
  if (!onwater(this.x+1.5,this.y+2)) return;
  this.return = int(random(0,50));
  if(this.return > 45) {
    // stuff
  }
} 


'return' will stop the function immediately.

Also, it may be a problem with some sort of level thing... I doubt it, but try something like:
this.level.onwater(x,y);

Neither works.