The concept of our Ecological Footprint when considering the ocean resources, is the literal footprint of bottom trawling and other destructive practices in marine harvest. The same with unsustainable examples of aquaculture leading us to realize there are implications for ecological footprint in our choice of marine food menues.
The work of Dr.Bill Reese could be profiled here.
See the reference from http://www.unep.org/geo/geo4/report/06_Regional_Perspectives.pdf
WATER: http://www.unep.org/geo/geo4/report/04_Water.pdf