The ferries depart from Puerto De Mogan several times daily, to Puerto Rico, Anfi beach and Arguineguin. There are 2 different companies operating on these routes, the blue ferries are "Linia Bluebird" and the green is "Linia Salmon"
Both companies have boats with glass bottom, and at certain points along the way, you stop and feed the fish, which you can observe through the thick glass panes. It seems as if the fish know that there is food in store, as soon as the boats are stationary, the water surface completely alive.
There are departures from Puerto De Mogan several times a day and the trip to Puerto Rico takes about 30 minutes. If one of the "long" trip to Arguineguin, it is about 1 hour.
If you want to see the southcoast of Gran Canaria and the beach from a slightly different page, this is a good option and you decide when you will return again, you just remember to sail with the same company both ways, and you must return the same day.