Atlantic menhaden is a silvery-blue herring with dark spots on the sides. Large schools of menhaden visit the Chesapeake Bay from spring through autumn.
The Atlantic menhaden has a blue, bluish-green or bluish-brown body. It grows to 14 to 18 inches in length. Its sides, fins and belly are silvery, often with a yellowish sheen. A dark, round spot on its shoulder is followed by smaller spots arranged in somewhat horizontal rows. It has a projecting lower jaw and a deeply forked tail fin.
Menhaden live throughout the Chesapeake Bay, forming large schools that swim just below the water’s surface.
Menhaden visit the Bay from spring through autumn, leaving for deeper, warmer ocean waters in winter. Juveniles sometimes overwinter in the Bay.
The menhaden is a filter-feeder that feeds by swimming rapidly to capture water in its open mouth, then filtering out plankton in the water.
Menhaden are one of the most important food sources for larger predators, including bluefish, weakfish, striped bass, sharks, mackerels, and fish-eating seabirds and mammals.
Spawning occurs over the mid-Atlantic continental shelf in spring and autumn. Eggs hatch at sea. Larvae spend about two months there before drifting into the Bay and other estuaries. Larvae eventually move into brackish waters, where they grow rapidly throughout the summer. Menhaden can live 10 to 12 years.