River Herring

About the River Herring

River Herring, encompassing both Alewife and Blueback Herring, are sleek, silvery fish recognized by their somewhat compressed bodies and a distinct, often iridescent blue or green hue on their backs that fades to gleaming silver sides. They possess relatively large eyes, especially the Alewife, and a small, pointed head. Typically, these migratory fish grow to an average size of 10-15 inches, making them a modest but abundant catch during their spawning runs. Identifying the two species apart can be subtle, often requiring close inspection of eye size and body depth.

Source: FishBase & iNaturalist

Habitat

These anadromous fish spend the majority of their adult lives in coastal marine waters and estuaries. During their spawning migrations, they ascend into freshwater rivers and streams, pushing far inland to reach lakes, ponds, and slower-moving river sections. They favor brackish water transitional zones before entering purely fresh environments for reproduction.

Distribution

River Herring are found along the Atlantic coast of North America, with their range extending from Nova Scotia in Canada down to Florida. While Alewives tend to be more prevalent in northern waters, Blueback Herring are commonly found further south, with significant overlap in their distribution.

Behaviour

River Herring are strong schooling fish, undertaking impressive annual migrations from the ocean into freshwater to spawn, typically in spring. They are primarily planktivorous, filtering vast quantities of zooplankton and small invertebrates from the water column using their gill rakers. After spawning, adults return to the ocean, and the juvenile herring will follow in late summer and fall.

Edibility

★★★★★

River Herring are considered flavorful, albeit somewhat bony, with an oily flesh that holds up well to specific preparations. They are highly prized for smoking, pickling, or salting, which enhances their rich taste and extends their shelf life. While not often pan-fried, their unique flavor makes them a traditional delicacy for many.

Lure suggestion

Anglers often target River Herring during their spring spawning runs using light tackle. Small, flashy artificial lures such as tiny spoons (e.g., silver or gold Darters), spinners, or weighted flies (like wet flies or small streamers) are highly effective. For bait fishing, small pieces of worm or fish roe presented on a small hook under a bobber or on a simple bottom rig can also yield good results.