Dolphin deterrence

Is there a way to stop dolphins from being annoying? The last time I was bottom fishing in the Gulf, we caught lots of fish in the presence of a dolphin pod.

The dolphins hung right near us and quickly snatched up any fish we released. Some of these fish would have been keeper snapper if they were in season.

In the past, I have just moved from a successful fishing spot to rid myself of them. Someone suggested that blasting an air horn underwater works. I wont do that because I am concerned it may harm the dolphin.

Is there another way that is not harmful to the dolphins?

Thanks