21 But Moses said, "Here I am among six hundred thousand men on foot, and you say, 'I will give them meat to eat for a whole month!' 22 Would they have enough if flocks and herds were slaughtered for them? Would they have enough if all the fish in the sea were caught for them?" 23 The LORD answered Moses, "Is the LORD's arm too short? You will now see whether or not what I say will come true for you."
Moses still isn't convinced that God is going to do what he says and God responds with a bit of (godly) sarcasm. I imagine him sitting back with His legs up on pluto, juggling a couple of galaxies saying, "Moses, is my arm to short to reach down there and gather up all the fish in the sea?" Our God does not have short arms. We worship a long-armed God and nothing is impossible for Him!