Roman ship had on-board fish tank : Nature News: "A Roman ship found with a lead pipe piercing its hull has mystified archaeologists. Italian researchers now suggest that the pipe was part of an ingenious pumping system, designed to feed on-board fish tanks with a continuous supply of oxygenated water. Their analysis has been published"
We do transfer farmed salmon from the pens to the processor with large oxygenated tanks in the Puget Sound. The fish are still alive when they reach the plant this way!