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Theoretically yes, but practically probably not as much as I thought (if my math is right).
Sea water around here weighs about 64 lbs/cubic foot and freshwater 62.2 lbs. If you float a 2 oz surface swimmer in freshwater that displaces 1 oz of water (ie the plug is 1/2 submerged) it has displaced 28.4 grams of water. In order for it to displace a similar amount of heavier sea water and float 1/2 way down it needs to displace 29.2 grams (28.4/62.2 = 29.2/64) so your plug needs to be 1 gram heavier to float the same. That is not much but if it worries you use a slightly heavier belly weight or hooks in salt.
What lip are you using in the plug?
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