Clupea harengusMelker(Also: Oriental cure; Pickling; Sea herring; Sild)

Ge­o­graphic Range

Older ref­er­ences of At­lantic her­ring in­di­cate that pop­u­la­tions may move be­tween dif­fer­ent coastal re­gions after a num­ber of years, dis­ap­pear­ing off the coast of Nor­way, while show­ing up on the shores of Ger­many (Buf­fon, 1793). This process can be ex­plained by cli­matic forc­ing of At­lantic her­ring mi­gra­tion oc­cur­ing on a decadal cycle (Al­heit and Hagen, 1997) as well as fluc­tu­a­tions in spawn­ing caused by switches in re­cruit­ment in be­tween north­ern and south­ern pop­u­la­tions in the North Sea (Corten, 1999). (Al­heit and Hagen, 1997; Buf­fon, 1793; Corten, 1999)

Clu­pea haren­gus are closely re­lated to the Pa­cific her­ring Clu­pea pal­lasii pal­lasii, which re­sides mainly in the north­ern Pa­cific Ocean. Re­cent ge­netic ev­i­dence in­di­cates that these two species di­verged roughly 1.3 mil­lion years ago (Do­man­ico, et al., 1996). (Do­man­ico, et al., 1996)

Habi­tat

At­lantic her­ring Clu­pea haren­gus are found in the palagic zone of ma­rine wa­ters, as well as coastal zones of through­out their ge­o­graphic reach. (Bigelow and Schroeder, 1953; Buf­fon, 1793; "Her­ring Bi­ol­ogy: What is a her­ring?", 2004; Jones, 1795; Leeuwen­hoek, 1798)

(Note: the max­i­mum depth value given is based on a value of 50 fath­oms (Bigelow and Schroeder, 1953)). (Bigelow and Schroeder, 1953)

  • Range depth
    36.576 to 0 m
    120.00 to 0.00 ft

Phys­i­cal De­scrip­tion

Clu­pea haren­gus grow to about 17 inches (45.72 cm) and can weigh up to 1.5 pounds (0.68 kg) (Bigelow and Schroeder, 1953; Gulf of Maine Aquar­ium, 2004d). At­lantic her­ring stocks in the Baltic Sea have re­cently seen sig­nif­i­cant de­creases in weight-at-age in all age-classes with larger de­clines in north­ern pop­u­la­tions than south­ern pop­u­la­tions, and in younger age groups than in older groups (Car­di­nale and Ar­rhe­nius, 2000). The re­sult of this de­crease in weight-at-age could be in­dica­tive of a change in the av­er­age size of all Clu­pea haren­gus pop­u­la­tions, or it may only be a case of Baltic Sea pop­u­la­tions. (Bigelow and Schroeder, 1953; Car­di­nale and Ar­rhe­nius, 2000; "Her­ring Bi­ol­ogy: What is a her­ring?", 2004)

Clu­pea haren­gus are lat­er­ally com­pressed, with a mod­er­atly pointed nose, a large mouth at the tip of the snout, and a pro­ject­ing lower jaw. They have a "saw-toothed keel" belly and a deeply forked tail. The keel is only weakly saw­toothed as com­pared to other mem­bers of its fam­ily. The dor­sal fin is sit­u­ated roughly mid­way down the back, and the ab­dom­i­nal fins are lo­cated al­most di­rectly below it. There is no adi­pose fin. The scales are large and loosely at­tached. The key anatom­i­cal dif­fer­ence be­tween Clu­pea haren­gus and other mem­bers of the fam­ily is an oval patch of small teeth on the vomer bone at the cen­ter of the roof of the mouth (Bigelow and Schroeder, 1953). (Bigelow and Schroeder, 1953; Bigelow and Schroeder, 1953)

The body color is of a deep steel blue or green­ish blue, with sil­ver sides and belly. Ven­tral and anal fins are translu­cent white. The pec­torals are dark at their base and along the upper edge. The cau­dal and dor­sal fins are also dark(Bigelow and Schroeder, 1953). (Bigelow and Schroeder, 1953)

  • Sexual Dimorphism
  • sexes alike
  • Range mass
    0.68 (high) kg
    1.50 (high) lb
  • Range length
    45.72 (high) cm
    18.00 (high) in

De­vel­op­ment

Clu­pea haren­gus eggs are laid on rocky to sandy sub­strate, rarely on mud, from 3.7 m to 54.9 m on the North Amer­i­can side of the At­lantic. In Scan­di­navia, depths of 182.9 m have been recorded. Fer­til­iza­tion may take place in spring, sum­mer, or au­tumn, ac­cord­ing to lo­cal­ity and sub­type of At­lantic her­ring (Bigelow and Schroeder, 1953). (Bigelow and Schroeder, 1953)

In­cu­ba­tion lasts any­where from 10 to 40 days, de­pend­ing on local water tem­per­a­tures. Colder tem­per­a­tures (roughly 3.3 deg C) in­di­cate a longer in­cub­tion time. In­cu­ba­tion can take place in water tem­per­a­tures of up to 15 deg C. Tem­per­a­ture ranges above and below these lim­its pro­duced no vi­able hatch­ings (Bigelow and Schroeder, 1953). (Bigelow and Schroeder, 1953)

At the time of hatch­ing, Clu­pea haren­gus are about 6 mm long. Their small yolk sack is usu­ally com­pletely ab­sorbed by the time they reach 10 mm in length. At 15 to 17 mm, the dor­sal fin forms. The anal fin forms when At­lantic her­ring reach about 30 mm. Ven­tral fins be­come vis­i­ble at 30 to 35 mm. The tail be­comes well-forked at around this length as well. Only when At­lantic her­ring reach 40 mm do they start to fully re­sem­ble ma­ture her­ring (Bigelow and Schroeder, 1953). (Bigelow and Schroeder, 1953)

At roughly 2 years of age, Clu­pea harenga are about 19 to 20.5 cm in length, and start to ac­cu­mu­late large amounts of fat in the body tis­sue and vis­cera dur­ing warm months. This fat is lost in the win­ter and at the ap­proach of sex­ual ma­tu­rity (Bigelow and Schroeder, 1953). (Bigelow and Schroeder, 1953)

Re­pro­duc­tion

At­lantic her­ring ag­gre­gate into mas­sive schools in the late sum­mer and early fall. In the west­ern At­lantic, they move into coastal wa­ters at var­i­ous lo­ca­tions in the Gulf of Maine and off­shore banks of Nova Sco­tia to spawn. Spawn­ing times vary for dif­fer­ent pop­u­la­tions of At­lantic her­ring. ("Her­ring Bi­ol­ogy: Ecol­ogy", 2004)

Clu­pea haren­gus uses ex­ter­nal fer­til­iza­tion of eggs. As fe­male her­ring re­lease eggs, male her­ring re­lease clouds of milt si­mul­ta­ne­ously. Her­ring are fat prior to spawn­ing, after months of eat­ing plank­ton blooms. ("Her­ring Bi­ol­ogy: Ecol­ogy", 2004)

Ma­ture eggs make up a large por­tion (20%+) of the fe­male's body weight. The fe­cun­dity of her­ring fe­males is typ­i­cally in the range of 20,000-50,000 eggs per fe­male, al­though a large fe­male her­ring can lay as many as 200,000 eggs. Her­ring are iteroparous and gen­er­ally live to spawn re­peat­edly for sev­eral years. After spawn­ing, their weight de­clines with the loss of ga­metes and as­so­ci­ated fat con­tent. ("Her­ring Bi­ol­ogy: Ecol­ogy", 2004)

  • Breeding interval
    Atlantic herring usually spawn after reaching 25.5cm.
  • Breeding season
    Atlantic herring may spawn in spring, summer, or autmn, depending on local conditions and the subspecies of herring.
  • Range number of offspring
    200000 (high)
  • Average number of offspring
    20000-50000
  • Range time to hatching
    10 to 40 days
  • Average time to hatching
    11 days
  • Range age at sexual or reproductive maturity (female)
    3 to 6 years
  • Average age at sexual or reproductive maturity (female)
    4 years
  • Range age at sexual or reproductive maturity (male)
    3 to 6 years
  • Average age at sexual or reproductive maturity (male)
    4 years

There is no ev­i­dence that At­lantic her­ring in­vest any en­er­gies to­ward par­ent­ing after they spawn.

  • Parental Investment
  • pre-fertilization
    • provisioning

Lifes­pan/Longevity

Clu­pea haren­gus may live up to 20 years.

Be­hav­ior

At­lantic her­ring ag­gre­gate into mas­sive schools in the late sum­mer and early fall. In the west­ern At­lantic, they move into coastal wa­ters at var­i­ous lo­ca­tions in the Gulf of Maine and off­shore banks of Nova Sco­tia to spawn (Gulf of Maine Aquar­ium, 2004c). ("Her­ring Bi­ol­ogy: Ecol­ogy", 2004)

Com­mu­ni­ca­tion and Per­cep­tion

Al­though lit­tle is known of the be­hav­ioral rea­sons be­hind their noise pro­duc­tions, Clu­pea haren­gus are known to pro­duce and per­ceive sounds. Noise is usu­ally pro­duced at night by is prob­a­bly the re­sult of force­ful ejec­tion of air from the anal duct. The fre­quency of noise pro­duc­tion did not change due to feed­ing. This noise pro­duc­tion tends to in­crease with in­creas­ing num­bers of her­ring in a school, lead­ing to spec­u­la­tion that there is a so­cial com­po­nent to noise pro­duc­tion (Wil­son, Batty, and Dill, 2003). (Wil­son, et al., 2003)

Food Habits

In the late 1700s, Leeuwen­hoek hy­poth­e­sized that Clu­pea haren­gus was a plank­ton feeder, stat­ing that "See­ing these things, I did not won­der that fish­er­men should imag­ine Her­rings have no food in their stom­achs, be­cause Her­rings do, in my opin­ion, feed on such small fishes ["an­i­mac­ules"], that they can­not take in suf­fi­cient quan­ti­ties of them to dis­tend their stom­achs, as we see in other fish; and hence it is said, that Her­rings have no food in within their stom­achs." (Leeuwen­hoek, 1798) (Leeuwen­hoek, 1798)

With the ad­vent of bet­ter mi­cro­scopes and ob­ser­va­tional tech­niques, it was found that plank­ton (the "an­i­maclues" of Leeuwen­hoek's time) that Clu­pea haren­gus feeds upon, start­ing with lar­val snails, di­atoms, peri­dini­ans when first hatched, mov­ing on to cope­pods, am­phipods, pelagic shrimps, and de­ca­pod crus­tacean lar­vae when they reach adult­hood (Bigelow and Schroeder, 1953). (Bigelow and Schroeder, 1953)

  • Animal Foods
  • fish
  • eggs
  • mollusks
  • aquatic or marine worms
  • aquatic crustaceans
  • other marine invertebrates
  • zooplankton

Pre­da­tion

As At­lantic her­ring are the prey species of many species of fish, mam­mals, and birds, her­ring are al­most al­ways found in schools (Bigelow and Schoreder, 1953). Some schools dis­play elab­o­rate pat­terns (Gulf of Maine Aquar­ium, 2004b). These schools may be quite large, stretch­ing sev­eral miles in length and vis­i­bly dark­en­ing the wa­ters (Jones, 1795). (Bigelow and Schroeder, 1953; "Her­ring Bi­ol­ogy: Life-Cy­cle", 2004; Jones, 1795)

Clu­pea haren­gus is a prey species of cod, pol­lock, had­dock, sil­ver hake, striped bass, mack­erel, tuna, salmon, dog­fish (Bigelow and Schroeder, 1953), har­bor por­poises Pho­coena pho­coena, har­bor seals Phoca vi­t­ulina, gray seals Hali­choerus gry­pus, At­lantic puffins Frater­cula arc­tica, ra­zor­bills Alca torda, com­mon terns Sterna hirundo, arc­tic terns Sterna arc­tica, killer whales, baleen whales (Gulf of Maine Aquar­ium, 2004b), and hu­mans Homo sapi­ens. (Bigelow and Schroeder, 1953; "Her­ring Bi­ol­ogy: Life-Cy­cle", 2004)

Ecosys­tem Roles

Her­ring are a crit­i­cal part of the At­lantic ecosys­tem, being a prey species for a large va­ri­ety of species. They are pelagic plank­ton feed­ers (Gulf of Maine Aquar­ium, 2004b). ("Her­ring Bi­ol­ogy: Life-Cy­cle", 2004)

At­lantic her­ring are also the host of sev­eral par­a­sitic species. In a study of 220 Nor­we­gian spring spawn­ing her­ring, Tolo­nen and Karls­bakk (2002) de­tected 11 par­a­sitic species: the coc­co­di­ans Gous­sia clu­pearum and Eime­ria sar­di­nae, spores of the myx­o­zoan Cer­ato­myxa auer­bachi, adult trema­todes Hemi­u­rus spp., adult and lar­val ne­ma­todes Hys­terothy­lacium adun­cum and Anisakis sim­plex, and Cryp­to­cotyle lin­gua metac­er­car­ial in­fec­tions. (Tolo­nen and Karls­bakk, 2003)

Eco­nomic Im­por­tance for Hu­mans: Pos­i­tive

Her­ring fish­eries in both Eu­rope and North Amer­ica have been im­por­tant sources of pro­tein in diets going back cen­turies. Jones (1795) in­di­cates that the Dutch fish­ery dates back to 1167, and Al­heit and Hagen (1997) in­di­cate the pres­ence of a Swedish fish­ery dat­ing back to the 10th Cen­tury. In North Amer­ica, the Na­tive Amer­i­cans were the first ones to use a sys­tem of weirs to catch her­rings, as they were dif­fi­cult to catch using the tra­di­tional meth­ods of hook or spear (Gulf of Maine Aquar­ium, 2004). (Jones, 1795)

The love of At­lantic her­ring as a food­stuff in Britain was well cap­tured by Jones (1795): "Yarmouth has long been fa­mous for its her­ring [fare], which was reg­u­lated by an act in the 31st [year] of Ed­ward the Third: and that town is obliged, by its char­ter, to send to the sher­iffs of Nor­wich 100 her­rings, to be made into twenty-four pies, by them to be de­liv­ered to the lord of the manor of East Car­leton, who is to con­vey them to the king." (Jones, 1795)

The At­lantic fish­ery con­tin­ues to be a pop­u­lar, if not a highly eco­nomic, one. In 2001, the New Eng­land her­ring fish­ery had an es­ti­mated total value of $15,615,237 in U. S. dol­lars (Parker, 2003). Sim­i­lar fish­eries are found through­out the range of Clu­pea haren­gus. (Parker, 2003)

The nu­tri­tional in­for­ma­tion for raw At­lantic her­ring is: 158 Calo­ries/100g, 17.96g pro­tien/100g, 0.0g car­bo­hy­drate/100g, 2.04g sat­u­rated fatty acid/100g, 3.736g mono­sat­u­rated fatty acid/100g, 2.133g polyun­sat­u­rated fatty acid/100g ("Calo­ries In Her­ring", 2004)

  • Positive Impacts
  • food
  • research and education

Eco­nomic Im­por­tance for Hu­mans: Neg­a­tive

Be­fore large-scale fish­ing op­er­a­tions started in North Amer­ica, the vast­ness of the shoals of At­lantic her­ring "be­came ab­solutely a nui­sance" in the Chesa­peake Bay area (Buf­fon, 1793). Clu­pea haren­gus can be very sus­cep­ti­ble to pol­lu­tion and being beached dur­ing large storms. Bigelow and Schoreder (1953) de­scribe a "slaugh­ter of her­ring" that started in Oc­to­ber 5, 1920 and re­sulted in a tidal har­bor be­com­ing com­pletely cov­ered with dead her­ring. The large anoxic zone re­sult­ing from the de­com­po­si­tion of the mas­sive num­ber of dead her­ring caused even more fish kills. (Bigelow and Schroeder, 1953; Buf­fon, 1793)

Con­ser­va­tion Sta­tus

Clu­pea haren­gus is not an en­dan­gered species. How­ever, with heavy fish­ing in the 1960s and a lack of re­cruit­ment in the 1970s, At­lantic her­ring fish­eries crashed. Al­though the fish­ery re­cov­ered since then, its vul­ner­a­bil­ity, es­pe­cially with in­creased po­ten­tial of cli­mate vari­abil­ity has lead the sev­eral coun­tries to con­duct stud­ies look­ing at sus­tain­able her­ring har­vests (Al­heit and Hagen, 1997). (Al­heit and Hagen, 1997)

Other Com­ments

The fol­low­ing is a late 18th Cen­tury Eng­lish recipe for her­ring pie, per­haps sim­i­lar to the one re­quired of the city of Yarmouth in its city char­ter. The au­thor of this taxon ac­count adds this recipe ONLY as proof that her­ring have been used in a va­ri­ety of dif­fer­ent food­stuffs for some time through­out his­tory, and NOT as a sug­ges­tion for any fu­ture meal.

"A HER­RING PYE: Scale, gut, and wash them very clean, cut off the heads, fins, and tails; make a good crust, cover your dish, then sea­son your her­rings with beaten mace, pep­per and salt; put a lit­tle but­ter in the bot­tom of your dish, then a row of her­rings; pare some ap­ples, and cut them in thin slices all over, then peel some onions, and cut them in slices all over thick, lay a lit­tle but­ter on the top, put in a lit­tle water, lay on the lid, and bake it well." (Gel­lory, 1762) (Gelleroy, 1762)

Con­trib­u­tors

Shaw Lacy (au­thor), Uni­ver­sity of Michi­gan-Ann Arbor, William Fink (ed­i­tor, in­struc­tor), Uni­ver­sity of Michi­gan-Ann Arbor, Renee Sher­man Mul­crone (ed­i­tor).

Glossary

Atlantic Ocean

the body of water between Africa, Europe, the southern ocean (above 60 degrees south latitude), and the western hemisphere. It is the second largest ocean in the world after the Pacific Ocean.

World Map

acoustic

uses sound to communicate

bilateral symmetry

having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.

chemical

uses smells or other chemicals to communicate

coastal

the nearshore aquatic habitats near a coast, or shoreline.

colonial

used loosely to describe any group of organisms living together or in close proximity to each other - for example nesting shorebirds that live in large colonies. More specifically refers to a group of organisms in which members act as specialized subunits (a continuous, modular society) - as in clonal organisms.

ectothermic

animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature

external fertilization

fertilization takes place outside the female's body

fertilization

union of egg and spermatozoan

food

A substance that provides both nutrients and energy to a living thing.

heterothermic

having a body temperature that fluctuates with that of the immediate environment; having no mechanism or a poorly developed mechanism for regulating internal body temperature.

holarctic

a distribution that more or less circles the Arctic, so occurring in both the Nearctic and Palearctic biogeographic regions.

World Map

Found in northern North America and northern Europe or Asia.

intertidal or littoral

the area of shoreline influenced mainly by the tides, between the highest and lowest reaches of the tide. An aquatic habitat.

iteroparous

offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).

migratory

makes seasonal movements between breeding and wintering grounds

motile

having the capacity to move from one place to another.

natatorial

specialized for swimming

native range

the area in which the animal is naturally found, the region in which it is endemic.

nomadic

generally wanders from place to place, usually within a well-defined range.

oviparous

reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.

pelagic

An aquatic biome consisting of the open ocean, far from land, does not include sea bottom (benthic zone).

phytoplankton

photosynthetic or plant constituent of plankton; mainly unicellular algae. (Compare to zooplankton.)

planktivore

an animal that mainly eats plankton

polygynandrous

the kind of polygamy in which a female pairs with several males, each of which also pairs with several different females.

saltwater or marine

mainly lives in oceans, seas, or other bodies of salt water.

seasonal breeding

breeding is confined to a particular season

sexual

reproduction that includes combining the genetic contribution of two individuals, a male and a female

social

associates with others of its species; forms social groups.

tactile

uses touch to communicate

visual

uses sight to communicate

year-round breeding

breeding takes place throughout the year

zooplankton

animal constituent of plankton; mainly small crustaceans and fish larvae. (Compare to phytoplankton.)

Ref­er­ences

weightlossforgood.​co.​uk. 2004. "Calo­ries In Her­ring" (On-line). Ac­cessed Oc­to­ber 26, 2004 at http://​www.​weightlossforgood.​co.​uk/​nutrition/​herring.​htm.

Gulf of Maine Aquar­ium. 2004. "Her­ring Bi­ol­ogy: Dis­tri­b­u­tion" (On-line). Ac­cessed Oc­to­ber 26, 2004 at http://​www.​gma.​org/​herring/​biology/​distribution/​default.​asp.

Gulf of Maine Aquar­ium. 2004. "Her­ring Bi­ol­ogy: Ecol­ogy" (On-line). Ac­cessed Oc­to­ber 26, 2004 at http://​www.​gma.​org/​herring/​biology/​ecology/​default.​asp.

Gulf of Maine Aquar­ium. 2004. "Her­ring Bi­ol­ogy: Life-Cy­cle" (On-line). Ac­cessed Oc­to­ber 26, 2004 at http://​www.​gma.​org/​herring/​biology/​life_​cycle/​default.​asp.

Gulf of Maine Aquar­ium. 2004. "Her­ring Bi­ol­ogy: What is a her­ring?" (On-line). Ac­cessed Oc­to­ber 26, 2004 at http://​www.​gma.​org/​herring/​biology/​what/​default.​asp.

Gulf of Maine Aquar­ium. 2004. "Her­ring Har­vest: Fixed Gear Fish­ery - Her­ring Weirs in the Gulf of Maine" (On-line). Ac­cessed Oc­to­ber 26, 2004 at http://​www.​gma.​org/​herring/​harvest_​and_​processing/​weirs/​default.​asp.

Al­heit, J., E. Hagen. 1997. Long-term cli­mate forc­ing of Eu­ro­pean her­ring and sar­dine pop­u­la­tions. Fish­eries Oceanog­ra­phy, 6:2: 130-139.

Bigelow, H., W. Schroeder. 1953. Fishes of the Gulf of Maine. FISH­ERY BUL­LETIN OF THE FISH AND WILDLIFE SER­VICE, 74: 88-99. Ac­cessed Oc­to­ber 26, 2004 at http://​www.​gma.​org/​fogm/​Clupea_​harengus.​htm.

Buf­fon, G. 1793. Nat­ural his­tory of birds, fish, in­sects and rep­tiles. Em­bell­ished with up­wards of two hun­dred en­grav­ings. In five vol­umes. .... Lon­don: J.S. Barr.

Car­di­nale, M., F. Ar­rhe­nius. 2000. De­creas­ing weight-at-age of At­lantic her­ring (Clu­pea haren­gus) from the Baltic Sea be­tween 1986 and 1996: a sta­tis­ti­cal analy­sis. ICES Jour­nal of Ma­rine Sci­ence, 57: 882-893.

Corten, A. 1999. The reap­pear­ance of spawn­ing At­lantic her­ring (Clu­pea haren­gus) on Ab­erdean Bank (North Sea) in 1983 and its re­la­tion­ship to en­vi­ron­men­tal con­di­tions. Cana­dian Jour­nal of Fish­eries and Aquatic Sci­ences, 56: 2051-2061.

Do­man­ico, M., R. Phillips, J. Schweigert. 1996. Se­quence vari­a­tion in ri­bo­so­mal DNA of Pa­cific (Clu­pea pal­lasii pal­lasii) and At­lantic her­ring (Clu­pea haren­gus). Cana­dian Jour­nal of Fish­eries and Aquatic Sci­ences, 53: 2418-2423.

Gelleroy, W. 1762. The Lon­don cook, or the whole art of cook­ery made easy and fa­mil­iar. Con­tain­ing a great num­ber of ap­proved and prac­ti­cal re­ceipts in every branch of cook­ery.. Lon­don: S. Crow­der, and Co., J. Coote; and J. Fletcher.

Jones, S. 1795. A nat­ural his­tory of fishes, and of rep­tiles, in­sects, wa­ters, earths, fos­sils, ... com­piled from the best au­thor­i­ties, and il­lus­trated by a great va­ri­ety of cop­per plates, .... Lon­don: E. New­berry.

Leeuwen­hoek, A. 1798. The se­lect works of Antony Van Leeuwen­hoek, con­tain­ing his mi­cro­scop­i­cal dis­cov­er­ies in many of the works of na­ture. Trans­lated from the Dutch and Latin edi­tions pub­lished by the au­thor, by Samuel Hoole. .... Lon­don: Henry Fry.

Parker, P. 2003. "CC­CHFA At­lantic Her­ring Scop­ing Com­ments" (On-line). Ac­cessed Oc­to­ber 26, 2004 at http://​www.​ccchfa.​org/​headlines/​headlines_​article.​php?​page=1055517776.

Tolo­nen, A., E. Karls­bakk. 2003. The par­a­site fauna of the Nor­we­gian spring spawn­ing her­ring (Clu­pea haren­gus L.). ICES Jour­nal of Ma­rine Sci­ence, 60: 77-84.

Wil­son, B., R. Batty, L. Dill. 2003. Pa­cific and At­lantic her­ring pro­duce burst pulse sounds. Pro­ceed­ing of the Royal So­ci­ety of Lon­don B, Sup­ple­ment: S1-S3. Ac­cessed No­vem­ber 11, 2004 at http://​www.​zoology.​ubc.​ca/​~bwil­son/her­ring/FRT­ing_her­ring_Wil­son_et_al.pdf.