If you are referring to the Red Tide, then, it is a form of algae called "Gymnodinium breve". Not everyone agrees on the reason the algae booms, and causes the water to appear red, but it is said to be a natural phenomena and it's not good for the ocean life or people. you shouldn't eat fin fish that are from a red tide area, red tide produces potent neurotoxins.
George Armytage Rounsefell was an American author known for his works on fly fishing. He authored books such as "Fly Fishing 101" and "The American Line: Fly Fishing Techniques for Trout and Panfish." Rounsefell's writings have been praised for their practical tips and insights into the sport of fly fishing.