The water intermingles and becomes (I think it’s called) brackish water. The fish that live there adapt for a ways each direction to this water.
In New Orleans, on Lake Ponchatrain, you can drive your boat through bayous and canals into the Gulf of Mexico. I have seen shrimp trawlers in the lake, which is fresh water where the Gulf is salt water. I fished an area in Florida one time where the two waters met, I caught some Reds (salt water) and some catfish (fresh water).
I live a long ways from salt water so some of my info may need corrected, hopefully some salt water folks can add to this.
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