Atlantic Menhaden

The Atlantic Menhaden is a deep-bodied schooling fish in the herring family (Clupeidae), found in enormous numbers along the eastern coast of North America from Nova Scotia to Florida. It belongs to the genus Brevoortia, a group of filter-feeding coastal pelagic fish sometimes called bunker or pogy. Menhaden are ecologically important as one of the primary forage species along the Atlantic seaboard, filtering huge volumes of phytoplankton and zooplankton from the water column and, in turn, supporting striped bass, bluefish, ospreys, and other predators. The species forms massive, visible surface schools and is closely monitored by coastal fisheries agencies due to its outsized role in the marine food web.

Field marks:

• Deep, laterally compressed body with a large head relative to body length
• Strongly silvery flanks with a greenish to bronze-colored back
• One large, dark spot immediately behind the gill cover, followed by a row of smaller, fainter spots toward the tail
• Sharp scutes along the belly midline
• Deeply forked tail, single dorsal fin
• Adults typically 20-37 cm

Atlantic Menhaden are distinguished from American Shad and river herrings by their proportionally larger head, deeper body, and the single prominent shoulder spot followed by smaller secondary spots, along with their oilier, less compressed profile.

Atlantic Menhaden inhabit coastal and estuarine waters along the eastern seaboard of North America, ranging from Nova Scotia to central Florida. They are found from the surface to moderate depths over the continental shelf and make extensive use of estuaries and bays, particularly as nursery habitat for juveniles. Adults undertake seasonal migrations, moving northward along the coast in warmer months and southward toward wintering grounds off the Carolinas and Florida as waters cool. The species tolerates a wide salinity range and is commonly found in brackish estuarine systems as well as fully marine coastal waters.

Atlantic Menhaden are obligate filter feeders, swimming with their mouths open to strain phytoplankton and zooplankton from the water using fine gill rakers, a feeding mode that allows them to process enormous volumes of water. They form dense, highly visible surface schools that can stretch for considerable distances, often observed as coordinated dimpling or rippling at the surface. Schools undertake seasonal coastal migrations tracking water temperature. Spawning occurs offshore over an extended season, with eggs and larvae subsequently transported into estuaries, where juveniles spend their first year growing before joining coastal adult populations. As a dominant plankton-to-predator energy link, menhaden support major populations of predatory fish, seabirds, and marine mammals along the Atlantic coast.