fish

Menhaden are a small, bony, oily little fish that have been called "the most important fish in the sea" because of their key role in the food chain, providing nutrition for striped bass, osprey, dolphins and many other species. Menhaden are being overfished by industrial fleets, prompting the Atlantic States Marine Fisheries Commission on Friday to mandate a 20 percent reduction in the annual catch.

Aquaculture is growing in popularity around the world, but the high density of waste created by fish farms poses an environmental threat. David Love, a project director at the Johns Hopkins Center for a Livable Future, is trying to solve this problem through aquaponics -- the recycling of fish waste to feed vegetables growing on rafts.