Identification
A silvery, compressed body and a dark spot behind the head are useful starting clues. The sharp-edged belly scales account for the familiar name “sawbelly.”
Alewife and Blueback Herring are different species despite their similar appearance and shared name, river herring. A photograph of a silver fish alone may not establish which is present.
Habitat and Natural Food
Alewives feed on tiny drifting animals, particularly zooplankton. Schools in open water provide food for larger predators.
Coastal populations travel into freshwater to spawn, while landlocked populations complete the cycle in freshwater. A record in a lake does not establish whether fish have a connection to the ocean.
Size and Weight
Great Lakes Alewives are commonly about 3–6 inches long. Coastal adults can be considerably larger, with roughly 10–12 inches frequently described.
These population-specific ranges are more useful than one combined average. No typical weight is assigned across both life histories.
Fishing and Management
Alewives are used as bait in some fisheries, but collection, possession and transport rules vary. Confirm the local requirements before catching or moving baitfish.
Coastal river herring recovery emphasizes access to spawning habitat. Inland introductions can have very different ecological consequences, so a thriving population in one setting does not justify moving fish to another.
One Fish, Two Ways of Living
An Alewife can belong to a sea-going population or a landlocked one. That distinction changes migration, adult size and the surrounding food web. It also explains why advice based on an Atlantic spawning run may not describe a Great Lakes school.
All Lakes With Alewife
Browse all lakes and reservoirs with confirmed Alewife records in our database, listed alphabetically.
Showing 1–24 of 122 lakes · Page 1 of 6
- Amos Lake Southeastern Connecticut, CT
- Ashland Pond Southeastern Connecticut, CT
- Ashokan Reservoir East Basin Ulster, NY
- Ashokan Reservoir West Basin Ulster, NY
- Aspinook Pond Southeastern Connecticut, CT
- Avery Pond Southeastern Connecticut, CT
- Ball Pond Western Connecticut, CT
- Beach Pond Northeastern Connecticut, CT
- Beardsley Pond Northwest Hills, CT
- Bigelow Pond Northeastern Connecticut, CT
- Billings Lake Southeastern Connecticut, CT
- Billington Sea Plymouth, MA
- Branford Supply Ponds South Central Connecticut, CT
- Buggs Island Lake (Kerr Reservoir) Mecklenburg, VA
- Bunnells Pond Greater Bridgeport, CT
- Cedar Lake Lower Connecticut River Valley, CT
- Chapmans Pond Lower Connecticut River Valley, CT
- Charge Pond Plymouth, MA
- Chauncy Lake Worcester, MA
- Chebacco Lake Essex, MA
- Cherokee Lake Hawkins, TN
- Claytor Lake Pulaski, VA
- Cliff Pond Barnstable, MA
- College Pond Plymouth, MA