../res/sprites/fish.png
../res/sprites/fish_frames.txt
still[down]: 0,1,2
still[left]: 3,4,5
still[up]: 6,7,8
still[right]: 9,10,11
walk[down]: 0,1,2
walk[left]: 3,4,5
walk[up]: 6,7,8
walk[right]: 9,10,11