Fish can be convenient pets, particularly if you are absent from home for long hours. But you may miss out on fun activities with them, such as going on walks. Fish have notoriously low endurance for strolls through the neighborhood.
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The Katsugyo Bag may change that. It appears to be a a pressurized water tank with a port on one end. The only information that I can find in English is second-hand, so we will have to wait for details about this invention will change human-fish relations.
-via Design You Trust