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Herring

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Herring
Atlantic herring,Clupea harengus
Global commercial capture of herrings
in million tonnes reported by theFAO1950–2010[1]

Herringareforage fish,mostly belonging to the family ofClupeidae.

Herring often move in largeschoolsaroundfishing banksand near the coast, found particularly in shallow, temperate waters of theNorth PacificandNorth Atlantic Oceans,including theBaltic Sea,as well as off the west coast of South America. Three species ofClupea(thetype genusof the herring family Clupeidae) are recognised, and comprise about 90% of all herrings captured in fisheries. The most abundant of these species is theAtlantic herring,which comprises over half of all herring capture. Fish called herring are also found in theArabian Sea,Indian Ocean,andBay of Bengal.

Herring played an important role in the history of marine fisheries in Europe,[2]and early in the 20th century, their study was fundamental to the development offisheries science.[3][4]Theseoily fish[5]also have a long history as an importantfood fish,and are oftensalted,smoked,orpickled.

Herring were also known as "silver darlings" in the United Kingdom.[6]

Species[edit]

A number of different species, most belonging to the familyClupeidae,are commonly referred to as herrings. The origins of the term "herring" is somewhat unclear, though it may derive from the same source as theOld High Germanherimeaning a "host, multitude", in reference to the large schools they form.[7]

Thetype genusof the herring family Clupeidae isClupea.[4]Clupeacontains only two species: theAtlantic herring(the type species) found in the North Atlantic, and thePacific herringmainly found in the North Pacific.Subspecificdivisions have been suggested for both the Atlantic and Pacific herrings, but their biological basis remains unclear.

Herrings in the genusClupea
Common name Scientific name Maximum
length
Common
length
Maximum
weight
Maximum
age
Trophic
level
Fish
Base
FAO ITIS IUCN status
Atlantic herring Clupea harengusLinnaeus, 1758 45.0 cm 30.0 cm 1.05 kg 22 years 3.23 [8] [9] [10] LC IUCN 3 1.svgLeast concern[11]
Pacific herring Clupea pallasiiValenciennes, 1847 46.0 cm 25.0 cm 19 years 3.15 [8] [12] [13] DD IUCN 3 1.svgData deficient[14]

In addition, a number of related species, all in the Clupeidae, are commonly referred to as herrings. The table immediately below includes those members of the family Clupeidae referred to byFishBaseas herrings which have been assessed by theInternational Union for Conservation of Nature.

Other herrings in the family Clupeidae
Group Common name Scientific name Maximum
length
Common
length
Maximum
weight
Maximum
age
Trophic
level
Fish
Base
FAO ITIS IUCN status
Freshwater herrings Toothed river herring Clupeoides papuensis(Ramsay & Ogilby, 1886) cm cm kg years [15] [16] DD IUCN 3 1.svgData deficient[17]
Round herrings Day's round herring Dayella malabarica(Day, 1873) cm cm kg years [18] [19] LC IUCN 3 1.svgLeast concern[20]
Dwarf round herring Jenkinsia lamprotaenia(Gosse, 1851) cm cm kg years [21] [22] LC IUCN 3 1.svgLeast concern[23]
Gilchrist's round herring Gilchristella aestuaria(Gilchrist, 1913 cm cm kg years [24] [25] LC IUCN 3 1.svgLeast concern[26]
Little-eye round herring Jenkinsia majuaWhitehead, 1963 cm cm kg years [27] [28] LC IUCN 3 1.svgLeast concern[29]
Red-eye round herring Etrumeus sadina(Mitchill, 1814) 33 cm 25 cm kg years [30] [31] [32] LC IUCN 3 1.svgLeast concern[33]
Two-finned round herring Spratellomorpha bianalis(Bertin, 1940) 4.5 cm cm kg years 3.11 [34] [35] DD IUCN 3 1.svgData deficient[36]
Whitehead's round herring Etrumeus whiteheadi(Wongratana, 1983) 20 cm cm kg years 3.4 [37] [38] [39] LC IUCN 3 1.svgLeast concern[40]
Venezuelan herring Jenkinsia parvulaCervigón and Velasquez, 1978 cm cm kg years [41] [42] VU IUCN 3 1.svgVulnerable[43]
Thread herrings Galapagos thread herring Opisthonema berlangai(Günther, 1867) 26 cm 18 cm kg years 3.27 [44] [45] VU IUCN 3 1.svgVulnerable[46]
Middling thread herring Opisthonema medirastreBerry & Barrett, 1963 cm cm kg years [47] [48] LC IUCN 3 1.svgLeast concern[49]
Pacific thread herring Opisthonema libertate(Günther, 1867) 30 cm 22 cm kg years [50] [51] [45] LC IUCN 3 1.svgLeast concern[40]
Slender thread herring Opisthonema bulleri(Regan, 1904) cm cm kg years [52] [53] LC IUCN 3 1.svgLeast concern[54]
Other Araucanian herring Strangomera bentincki(Norman, 1936) 28.4 cm cm kg years 2.69 [55] [56] [57] LC IUCN 3 1.svgLeast concern[58]
Blackstripe herring Lile nigrofasciataCastro-Aguirre Ruiz-Campos and Balart, 2002 cm cm kg years [59] [60] LC IUCN 3 1.svgLeast concern[61]
Denticle herring Denticeps clupeoidesClausen, 1959 cm cm kg years [62] [63] VU IUCN 3 1.svgVulnerable[64]
Dogtooth herring Chirocentrodon bleekerianus(Poey, 1867) cm cm kg years [65] [66] LC IUCN 3 1.svgLeast concern[67]
Graceful herring Lile gracilisCastro-Aguirre and Vivero, 1990 cm cm kg years [68] [69] LC IUCN 3 1.svgLeast concern[70]
Pacific Flatiron herring Harengula thrissina(Jordan and Gilbert, 1882) cm cm kg years [71] [72] LC IUCN 3 1.svgLeast concern[73]
Sanaga pygmy herring Thrattidion noctivagusRoberts, 1972 cm cm kg years [74] [75] LC IUCN 3 1.svgLeast concern[76]
Silver-stripe round herring Spratelloides gracilis(Temminck & Schlegel, 1846) 10.5 cm cm kg years 3.0 [77] [78] LC IUCN 3 1.svgLeast concern[79]
Striped herring Lile stolifera(Jordan & Gilbert, 1882) cm cm kg years [80] [81] LC IUCN 3 1.svgLeast concern[82]
West African pygmy herring Sierrathrissa leonensisThys van den Audenaerde, 1969 cm cm kg years [83] [84] LC IUCN 3 1.svgLeast concern[85]

Also, a number of other species are called herrings, which may be related to clupeids or just share some characteristics of herrings (such as thelake herring,which is asalmonid). Just which of these species are called herrings can vary with locality, so what might be called a herring in one locality might be called something else in another locality. Some examples:

Other fishes called herring
Common name Scientific name Maximum
length
Common
length
Maximum
weight
Maximum
age
Trophic
level
Fish
Base
FAO ITIS IUCN status
Longfin herring Bigeyed longfin herring Opisthopterus macrops(Günther, 1867) cm cm kg years [86] [87] LC IUCN 3 1.svgLeast concern[88]
Dove's longfin herring Opisthopterus dovii(Günther 1868) cm cm kg years [89] [90] LC IUCN 3 1.svgLeast concern[91]
Hatchet herring Ilisha fuerthii(Steindachner, 1875) cm cm kg years [92] [93] LC IUCN 3 1.svgLeast concern[94]
Panama longfin herring Odontognathus panamensis(Steindachner, 1876) cm cm kg years [95] [96] LC IUCN 3 1.svgLeast concern[97]
Tropical longfin herring Neoopisthopterus tropicus(Hildebrand 1946) cm cm kg years [98] [99] LC IUCN 3 1.svgLeast concern[100]
Vaqueira longfin herring Opisthopterus effulgens(Regan 1903) cm cm kg years [101] [102] VU IUCN 3 1.svgVulnerable[103]
Equatorial longfin herring Opisthopterus equatorialisHildebrand, 1946 cm cm kg years [104] [105] LC IUCN 3 1.svgLeast concern[106]
Wolf herring Dorab wolf-herring Chirocentrus dorab(Forsskål, 1775) 100 cm 60 cm kg years 4.50 [107] [108] [109] LC IUCN 3 1.svgLeast concern[110]
Whitefin wolf-herring Chirocentrus nudusSwainson, 1839 100 cm cm 0.41 kg years 4.19 [111] [112] LC IUCN 3 1.svgLeast concern[113]
Freshwater whitefish Lake herring(cisco) Coregonus artediLesueur, 1818 cm cm kg years [114] [115] LC IUCN 3 1.svgLeast concern[116]

Characteristics[edit]

The species ofClupeabelong to the larger family Clupeidae (herrings,shads,sardines,menhadens), which comprises some 200 species that share similar features. These silvery-coloured fish have a singledorsal fin,which is soft, without spines. They have nolateral lineand have a protruding lower jaw. Their size varies between subspecies: theBaltic herring(Clupea harengus membras) is small, 14 to 18 cm (about 5.5 to 7 inches); the proper Atlantic herring (Clupea harengus harengus) can grow to about 46 cm (18 in) and weigh up 700 g (1.5 lb); andPacific herringgrow to about 38 cm (15 in).

Life cycle[edit]

Herring spawn

At least one stock of Atlantic herringspawnsin every month of the year. Each spawns at a different time and place (spring, summer, autumn, and winter herrings).Greenlandpopulations spawn in 0–5 metres (0–16 feet) of water, while North Sea (bank) herrings spawn at down to 200 m (660 ft) in autumn. Eggs are laid on the sea bed, on rock, stones, gravel, sand or beds ofalgae.Females may deposit from 20,000 to 40,000 eggs, according to age and size, averaging about 30,000. In sexually mature herring, the genital organs grow before spawning, reaching about one-fifth of its total weight.

The eggs sink to the bottom, where they stick in layers or clumps to gravel, seaweed, or stones, by means of their mucous coating, or to any other objects on which they chance to settle.

If the egg layers are too thick they suffer from oxygen depletion and often die, entangled in a maze ofmucus.They need substantial water microturbulence, generally provided bywave actionor coastalcurrents.Survival is highest in crevices and behind solid structures, because predators feast on openly exposed eggs. The individual eggs are1 to 1.4 mm (364to116in) in diameter, depending on the size of the parent fish and also on the local race. Incubation time is about 40 days at 3 °C (37 °F), 15 days at 7 °C (45 °F), or 11 days at 10 °C (50 °F). Eggs die at temperatures above 19 °C (66 °F).

The larvae are5 to 6 mm (316to14in) long at hatching, with a small yolk sac that is absorbed by the time the larvae reach10 mm (1332in). Only the eyes are well pigmented. The rest of the body is nearly transparent, virtually invisible under water and in natural lighting conditions.

The dorsal fin forms at15 to 17 mm (1932to2132in), the anal fin at about30 mm (1+316in)—the ventral fins are visible and the tail becomes well forked at 30 to35 mm (1+38in)— at about40 mm (1+916in), the larva begins to look like a herring.

Herring larvae are very slender and can easily be distinguished from all other young fish of their range by the location of the vent, which lies close to the base of the tail; however, distinguishingclupeoidsone from another in their early stages requires critical examination, especially telling herring fromsprats.

At one year, they are about 10 cm (4 in) long, and they first spawn at three years.

Egg to juvenile
Transparent eggs with theyolkand eyes visible and one larva hatched.
Freshly hatched larva in a drop of water beside a match to demonstrate how tiny it is: The black eyes and the yolk are visible.
Young larva in typical oblique swimming position, with remaining yolk still attached: Another larva at the upper right is in the classical S-shape of the beginning phase of attacking acopepod.
Still transparent juvenile herring, about 38 mm long and 3 months old: Visible are theotoliths,the gut, the silveryswimbladder,and the heart.

Ecology[edit]

Prey[edit]

Herrings consumecopepods,arrow worms,pelagic amphipods,mysids,andkrillin thepelagic zone.Conversely, they are a central prey item orforage fishfor highertrophic levels.The reasons for this success are still Enigma tic; one speculation attributes their dominance to the huge, extremely fast cruisingschoolsthey inhabit.

Herring feed onphytoplankton,and as they mature, they start to consume larger organisms. They also feed on zooplankton, tiny animals found inoceanicsurface 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 the chance of being seen by predators is less. They swim along with their mouths open, filtering the plankton from the water as it passes through their gills. Young herring mostly hunt copepods individually, by means of "particulate feeding" or "raptorial feeding",[117]a feeding method also used by adult herring on larger prey items like krill. If prey concentrations reach very high levels, as in microlayers, at fronts, or directly below the surface, herring becomefilter feeders,driving several meters forward with wide open mouth and far expandedopercula,then closing and cleaning thegill rakersfor a few milliseconds.

Copepods, the primary zooplankton, are a major item on the forage fish menu. Copepods are typically1–2 mm (132332in) long, with a teardrop-shaped body. Some scientists say they form the largest animalbiomasson the planet.[118]Copepods are very alert and evasive. They have largeantennae(see photo below left). When they spread their antennae, they can sense the pressure wave from an approaching fish and jump with great speed over a few centimetres. If copepod concentrations reach high levels, schooling herrings adopt a method calledram feeding.In the photo below, herring ram feed on a school of copepods. They swim with their mouths wide open and their operculae fully expanded.

Hunting copepods
This copepod has its antennae spread. The antennae detect the pressure wave of an approaching fish.
School of herringsram feedingon a school ofcopepodswithoperculaand mouth expanded: The fish swim in a grid with a distance of the jump length of their prey, as indicated by the animation at the right.
Animation showing how herrings hunt in a synchronised way to capture an alert and evasive copepod

The fish swim in a grid where the distance between them is the same as the jump length of their prey, as indicated in the animation above right. In the animation, juvenile herring hunt the copepods in this synchronised way. The copepods sense with their antennae the pressure wave of an approaching herring and react with a fast escape jump. The length of the jump is fairly constant. The fish align themselves in a grid with this characteristic jump length. A copepod can dart about 80 times before it tires. After a jump, it takes it 60 milliseconds to spread its antennae again, and this time delay becomes its undoing, as the almost endless stream of herring allows a herring to eventually snap up the copepod. A single juvenile herring could never catch a large copepod.[117]

Other pelagic prey eaten by herring includes fish eggs, larvalsnails,diatomsby herring larvae below20 mm (1316in),tintinnidsby larvae below45 mm (1+34in),molluscanlarvae,menhadenlarvae,krill,mysids,smaller fishes,pteropods,annelids,Calanusspp.,Centropagidae,andMeganyctiphanes norvegica.

Herrings, along withAtlantic codandsprat,are the most important commercial species to humans in the Baltic Sea.[119]The analysis of the stomach contents of these fish indicate Atlantic cod is the top predator, preying on the herring and sprat.[119][120]Sprat are competitive with herring for the same food resources. This is evident in the two species'vertical migrationin the Baltic Sea, where they compete for the limited zooplankton available and necessary for their survival.[121]Sprat are highly selective in their diet and eat only zooplankton, while herring are more eclectic, adjusting their diet as they grow in size.[121]In the Baltic, copepods of the genusAcartiacan be present in large numbers. However, they are small in size with a high escape response, so herring and sprat avoid trying to catch them. These copepods also tend to dwell more in surface waters, whereas herring and sprat, especially during the day, tend to dwell in deeper waters.[121]

Predators[edit]

Seabirds, like thisEuropean herring gull,attack herring schools from above.
Humpback whales attack herring schools bylungingfrom below.

Predatorsof herring includeseabirds,marine mammals such asdolphins,porpoises,whales,seals,andsea lions,predatory fish such assharks,billfish,tuna,salmon,striped bass,cod,andhalibut.Fishermenalso catch and eat herring.

The predators often cooperate in groups, using different techniques to panic or herd a school of herring into a tightbait ball.Different predatory species then use different techniques to pick the fish off in the bait ball. Thesailfishraises its sail to make it appear much larger.Swordfishcharge at high speed through the bait balls, slashing with their swords to kill or stun prey. They then turn and return to consume their "catch".Thresher sharksuse their long tails to stun the shoaling fish. These sharks compact their prey school by swimming around them and splashing the water with their tails, often in pairs or small groups. They then strike them sharply with the upper lobe of their tails to stun them.[122]Spinner sharkscharge vertically through the school, spinning on their axes with their mouths open and snapping all around. The sharks' momentum at the end of these spiraling runs often carries them into the air.[123][124]

Some whaleslunge feedon bait balls.[125]Lunge feeding is an extreme feeding method, where the whale accelerates from below the bait ball to a high velocity and then opens its mouth to a large gape angle. This generates the water pressure required to expand its mouth and engulf and filter a huge amount of water and fish. Lunge feeding byrorquals,a family of huge baleen whales that includes theblue whale,is said to be the largestbiomechanicalevent on Earth.[126]

Fisheries[edit]

↑ All herrings 2010[1]
Green =Clupeaherrings

Adult herring are harvested for their flesh and eggs, and they are often used asbaitfish.The trade in herring is an important sector of many economies around the world. In Europe, the fish has been called the "silver of the sea", and its trade has been so significant to many countries that it has been regarded as the most commercially important fishery in history.[127]

Purse seiningfor herring in southeast Alaska

As food[edit]

Akipperor split smoked herring

Herring has been astaple foodsource since at least 3000 BC. The fish is served numerous ways, and many regional recipes are used: eaten raw, fermented,pickled,or cured by other techniques, such as being smoked askippers.

Herring are very high in the long-chainOmega -3 fatty acidsEPAandDHA.[128]They are a source ofvitamin D.[129]

Water pollutioninfluences the amount of herring that may be safely consumed. For example, large Baltic herring slightly exceeds recommended limits with respect toPCBanddioxin,although some sources point out that the cancer-reducing effect of Omega -3 fatty acids is statistically stronger than thecarcinogeniceffect of PCBs and dioxins.[130]The contaminant levels depend on the age of the fish which can be inferred from their size. Baltic herrings larger than 17 cm (6.7 in) may be eaten twice a month, while herrings smaller than 17 cm can be eaten freely.[131]Mercury in fishalso influences the amount of fish that women who are pregnant or planning to be pregnant within the next one or two years may safely eat.

History[edit]

The herring has played a highly significant role in history both socially and economically. During the Middle Ages, herring prompted the founding ofGreat YarmouthandCopenhagenand played a critical role in the medieval development ofAmsterdam.[132]In 1274, while on his deathbed at the monastery of Fossanova (south of Rome, Italy), when encouraged to eat something to regain his strength,Thomas Aquinasasked for fresh herring.[133]

See also[edit]

References[edit]

Citations[edit]

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  2. ^Cushing, David H (1975)Marine ecology and fisheriesArchived2016-05-29 at theWayback MachineCambridge University Press.ISBN978-0-521-09911-0.
  3. ^Went, AEJ (1972) "The History of the International Council for the Exploration of the Sea".Proceedings of the Royal Society of Edinburgh.Section B. Biology,73:351–360.doi:10.1017/S0080455X0000240X
  4. ^abPauly, Daniel (2004)Darwin's Fishes: An Encyclopedia of Ichthyology, Ecology, and EvolutionArchived2016-05-29 at theWayback MachinePage 109, Cambridge University Press.ISBN978-0-521-82777-5.
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Sources[edit]

Further reading[edit]

External links[edit]