Actually, only two are tankers. The one in the thumbnail photo with the red deck and the one to the east that is pointing in a different direction from the rest.. The rest are dry cargo carriers (big squareish hatches with cranes on deck) or carriers of bulk cargo such as coal (big square hatches, no cranes). Also, they're all anchored. None are underway. They're most likely waiting to pull in to either load or unload.
Plenty of sail and power boats on the water though.
Sea - Cargo 
Plenty of sail and power boats on the water though.