Alewife and blueback herring (known as river herring) are relatively small fish that spend most of their adult life at see, but return to freshwater areas to spawn in the spring. Alewife spawn in rivers, lakes and tributaries from northeastern Newfoundland to South Carolina, but are most abundant in the Mid-Atlantic and Northeast. Blueback herring prefer to spawn in swift flowing rivers and tributaries from Nova Scotia to northern Florida, but are most numerous in waters from the Chesapeake Bay south. History of juvenile herring are sparce after they emigrate to the sea and before they mature and return to freshwater to spawn.
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