I thought this was pretty funny, thinking "cleaning" means washing the fish (rather than removing guts, etc., which is what it really means) -- especially since this guy was using this weird vacuum-like device to do something vacuum-like in the fish tank.
But then he got all annoyed when
he saw me taking pictures of another sign which said words to the
effect "Osaka Supermarket is not legally liable if a crab should pinch
you," and started screaming at me, "No pictures allowed in the store!"
guess he thought by doing this I would steal the fishes' souls or