Do boats float more in salt water?

Because according to the principle of Archimedes: "Any body immersed in a liquid undergoes a bottom-up thrust equal to the weight of liquid displaced"

When submerged, the boat displaces water.

Since salt water has greater weight per unit volume (density) than fresh water, the weight of the displaced salt water is higher. So the ship receives a bigger push in salt water than in fresh water. So it floats more.