TINY ZOOPLANKTON, often juvenile fish, feed on their plantlike cousins, the phytoplankton, at the base of the vast marine food web. Photos from the Cowen Lab show them in their wild and whimsical colorfulness, common names from left: sea butterfly, blue button jellyfish, lookdown, armored searobin, octopus and surgeon-fish. (Photos: Cedric Guigand)
