This will only take a few minutes. Pat the shrimp dry with a paper towel. Warm the oil or butter over medium-high heat: Tilt the pan as the oil warms, or butter melts, to coat the bottom of the pan. Add the shrimp to the hot pan: When the oil is hot and flows easily, add the shrimp to the pan. The shrimp should sizzle on contact (if not, warm your pan a little longer next time).
It is to be noted that the variations in salinity are the result of certain physical processes like evaporation, precipitation and freezing. Salinity decreases in case fresh water is added to the ocean water. It may be through any of the processes such as precipitation, influx of fresh water by rivers, surface runoff or the melting of snow and ice etc.
In colder climates, this leads to a phenomenon called stratification. During the summer, warm water, which is less dense, will sit on top of colder, denser, deeper water with a thermocline separating them. The warm layer is called the epilimnion and the cold layer is called the hypolimnion.