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I assume you are talking about the Fish River near Magnolia Springs/Marlow?

Depending upon rainfall and your location on the river you can get sufficient water from Weeks Bay to make the water brackish. Do you also fish in Weeks Bay, the Magnolia River and Mobile Bay?

I concur with the earlier recommendation to apply antifouling bottom paint to your Whaler. Nothing else will keep growth off the bottom. I recommend a good quality ablative water based paint carefully applied to a properly prepared hull. I use Petit Hydrocoat for my Whaler used mostly in Little Lagoon and other salt water around Gulf Shores and Orange Beach.