Intimidation in Gaza waters

This footage, according to @CPSGaza on Twitter, was lost at sea during this attack by Israeli Navy water cannon (and apparently live fire?), but since recovered from the sea:

Who is giving the orders to this Israeli Naval vessel to attack this monitoring boat with a water cannon? Who is allowing the use of live fire, on this boat, and on the boats of Palestinian fishermen (who also sometimes are targetted by water cannon?
What is the justification?

On Saturday, some of those earlier on board the Olivia, now disabled from the attacks of the Israeli Navy, went out on a Palestinian fishing boat instead.

One on board reported that the Israeli Navy “fired live rounds both in the water and directly at the boat for around 15 or 20 minutes”, and she confirmed here that the “Oliva project is currently on an indefinite hiatus”…