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If it's shore caught and big enough could you take it to a bait shop and get it weighed in, get a slip then return to fishing?
I don't remember all the fact about osmosis but if you keep it in cold fresh water it might actually absorb some of the freshwater. I'm getting older so I don't recall all the facts about osmosis and how fish control fluid transfer so this might just be what my twisted mind comes up with.
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