Ha, one would sure need a lot of salt in the water to stop it from freezing around here in the winter when the temperature can drop to 30 or 40° below zero, F.
Quote: "At least 15 percent of the ocean is covered by sea ice some part of the year. Ocean water freezes just like freshwater, but at lower temperatures. Fresh water freezes at 32 degrees Fahrenheit but seawater freezes at about 28.4 degrees Fahrenheit , because of the salt in it."
From:
https://oceanservice.noaa.gov/facts...text=At least 15 percent of,of the salt in it.