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.
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Because of salt. When salt is dissolved in water, as it is in ocean water, that dissolved salt adds to the mass of the water and makes the water denser than it would be without salt.
Yes. The boat in saltwater will float better because less water per volume has been displaced. The boat in freshwater is floating in a more H2O-concentrated area.