Noramally the fresh water ponds heat up faster than the salt that gets flow from the cool ocean the main thing for a pen is it must have no corners it must be round the bigger the better I have a friend who has them till august every year .he has a big round pen in a river off the main flow of the current.U have to watch out for critters like otters an stuff like that. a good sorce for mesh is Memphis net an twine do a search.
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