In The Netherlands, herring have played a major role in historical and economic development dating back to the 14th century.

Morphology

All of the 200 species in the family Clupeidae share similar distinguishing features. They are silvery colored fish that have a single dorsal fin. Unlike most other fish, they have soft dorsal fins that lack spines, though some species have pointed scales that form a serrated keel. They have no lateral line and have a protruding lower jaw. Their overall size varies from species to species: the Baltic herring is small, usually about 14 to 18 centimeters in length, the Atlantic herring can grow to about 46 cm (18 inches) in length and weigh up to 1.5 pounds (680 g), and Pacific herring grow to about 38 cm (15 inches).

Predators

Predators of adult herring include seabirds, dolphins, porpoises, seals, sea lions, whales, and humans. Sharks, dog fish, tuna, cod, salmon, halibut and other large fish also feed on adult herring. Many of these animals also prey on juvenile herring.

Diet

Young herring feed on phytoplankton and as they mature they start to consume larger organisms. Adult herring feed on zooplankton, tiny animals that are found in oceanic surface waters, and small fish and fish larvae. Copepods and other tiny crustaceans are the most common zooplankton eaten by herring. During daylight herring stay in the safety of deep water, feeding at the surface only at night when there is less chance of predation. They swim along with their mouths open, filtering the plankton from the water as it passes through their gills.

See Atlantic herring for videos of feeding juvenile herring, catching copepods.

Economy

Herring are an important economic fish. Adult fish are harvested for their meat and eggs. In Southeast Alaska herring is sold as baitfish. Environmental Defense suggests Atlantic herring (Clupea harengus) as one of the more environmentally responsible fish available.1

Cuisine

Herring has been a known staple food source since 3000 B.C. There are numerous ways the fish is served and many regional recipes: eaten raw, fermented, pickled, or cured by other techniques. The fish was sometimes known as "two-eyed steak".

Nutrition

Herring are very high in healthy long-chain Omega-3 fatty acids, EPA and DHAFact: date=October 2007. They are a source of vitamin D.