How to Identify Atlantic Herring

To identify Atlantic Herring (Clupea harengus), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

Dorsal side is typically dark blue to greenish-blue, fading to silvery flanks and a white belly. This countershading provides camouflage in the open ocean.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Deeply forked caudal fin, Single, relatively short dorsal fin located mid-body, Absence of a lateral line on the body (though neuromasts are present), Smooth, cycloid scales that are easily shed, Ventral keel of modified scales (scutes) along the belly, though not as pronounced as in some other clupeids.

Dorsal fin

Single, short dorsal fin with 17-21 soft rays, positioned approximately at the midpoint of the body.

Tail fin

Deeply forked, homocercal caudal fin, highly efficient for sustained swimming.

Pectoral fin

Small, low-set pectoral fins with 16-19 rays.

Distinctive fins

Pelvic fins are small, abdominal, and located beneath the dorsal fin. Anal fin is short, positioned far back on the body, with 16-20 soft rays.

Identification Tips

1. 1

   Body Shape and Coloration

   Look for the classic streamlined, torpedo-shaped body with a dark blue-green back and silvery sides/belly. This countershading is a key characteristic.

2. 2

   Fins

   Note the single, short dorsal fin located centrally, and the deeply forked caudal fin. The absence of spines in all fins is also diagnostic for Clupeidae.

3. 3

   Scales

   Herring have relatively large, smooth, and easily shed cycloid scales. A ventral keel of scutes is present but not sharply serrated like in some other clupeids.

4. 4

   Size

   Adult Atlantic Herring typically range from 20 to 38 cm (8 to 15 inches) in length, with some individuals reaching up to 45 cm (18 inches). Weight can range from 100 to 500 grams (0.2 to 1.1 lbs).

5. 5

   Absence of Lateral Line

   Unlike many fish, the Atlantic Herring lacks a visible lateral line along its body, although sensory neuromasts are present.

Explore Atlantic Herring