bait tanks
if you look at the bait tanks that the marinas use ,They are constantly recirculating the water. They pull the water from down in the water column cause it's cooler than the surface temp. they have a pump to pull water in and spray it and usually a overflow drain so as the water in the tank tops the drain it runs out. constant supply of cool fresh water is the key.
Same pricipal as a bait well on boat.
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