A BIRDNUT FOLLOWS THE BIRDS THAT FOLLOW THE FISH. Despite the tons of garbage, or perhaps because of that, this coastal portion of Manila Bay is teeming with fish.
This one looks like a school of "salinas" fish to me, the type used to make "tuyo." The school breaks out of the water for a few seconds when disturbed by birds flying overhead.
It took me a while to time the fish flight and get a recognizable capture. :)

Shooting info - Coastal Lagoon, Manila Bay, September 20, 2010, 1D4 + 500 f4 L IS + Canon 1.4x TC, 700 mm, f/7.1, ISO 400, 1/2000 sec, manual exposure in available light, 475B/3421 support.