High Island and Plover Cove reservoirs, from about 500m in the air. The colour difference is in part due to the depth, apparently - High Island, though smaller in surface area, is the deeper of the two and has the greater volume of water.
... seems to be the reaction of the average fish when approached by a cumbersome, bubble-making tank-wearing human in neoprene. This results in a lot of photos of fish tails. But I find that if I sneak along quietly without making any bubbles I can get close enough to take a cute little group of grazing fish by surprise.
Goatfish in HK
''little green jobs'' and a wrasse, Cebu
I suspect this is the strategy used by sharks to get their lunch.