This was an exercise to display a lot of 16-bit images on screen at once that are all animated/moving and randomized placement by the computer. You can press the “B” button to randomize the fish endlessly (within the range given in the program) while it plays back a soft melodic tune.
You can control the main fish, scale him up and down by using numeric keypad on right side and enable a red jellyfish.
Turned this into an aquarium demo of sorts and is a testing ground / lead-in to a bigger projected called Fish Feast Fury 64.
You can download the ROM HERE