public void Remove(Fish fish)
{
_fishes[fish.Location.X, fish.Location.Y] = null;
}
public void AddFish(Fish fish)
{
_fishes[fish.Location.X, fish.Location.Y] = fish;
}
public void MoveTo(Fish fish, Point newLocation)
{
Remove(fish);
_fishes[newLocation.X, newLocation.Y] = fish;
}