How about building a large fish tank in the ship, with piping that a small pump could use to suck oxygenated water from the ocean into the tank.
OK, the tank is hypothetical, but the piping is there--not as suitable as other means for pumping out the bilge but adequate, using a small hand pump, to maintain good water in a 4m^3 fish tank. Apparently the Romans transported live fish at least once (Pliny the Elder: to introduce a valuable species into a new region), and there'd be obvious luxury markets for live fish for ornamental purposes and for fresh exotic fish dinners. Mostly dinners.
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