Where freshwater and saltwater come together, you can see a variety of colors and color changes in the water. River water is typically brown and when it slides across the top of the saltwater, it can create a variety of colors. As the freshwater begins to mix with the saltwater, you’ll see more green water and as it gets to blue water, you’re in the good offshore saltwater. There are more differences in this water besides color and type. There are oxygen, salinity, temperature, and visibility differences, which attract different types of fish. For the best offshore fishing, look for blue water.