The following exert is an eye witness statement. Please read into it what you will. This has been reported to mufon who I am sure are investigating:
These fin-like objects move fast and seamless trough water often close to kiters. appears 2 times in this video. it was a semi-clear day with a very strong warm wind. i have seen dolphins in the area, but they don’t look anything like this. the object would also be way too large to be a dolphins fin. it is also too big to be a seagull and the wind was very strong that day, so no drones either. it doesn’t seem to experience any drag from the water and maintains a constant speed. i have no clue what this is.