Atlantic herring (''Clupea harengus'') is a herring
in the family Clupeidae
. It is one of the most abundant fish species in the world. Atlantic herrings can be found on both sides of the Atlantic Ocean
, congregating in large schools
. They can grow up to in length and weigh up to . They feed on copepod
and small fish, while their natural predators are seals
and other larger fish.
The Atlantic herring fishery
has long been an important part of the economy of New England
and the Canadian Atlantic provinces
. This is because the fish congregate relatively near to the coast in massive schools, notably in the cold waters of the semi-enclosed Gulf of Maine
and Gulf of St. Lawrence
. North Atlantic herring schools have been measured up to in size, containing an estimated 4 billion fish.
Atlantic herring have a fusiform
body. Gill rakers
in their mouths filter incoming water, trapping any zooplankton
Atlantic herring are in general fragile. They have large and delicate gill
surfaces, and contact with foreign matter can strip away their large scales.
They have retreated from many estuaries
worldwide due to excess water pollution
although in some estuaries that have been cleaned up, herring have returned. The presence of their larva
e indicates cleaner and more–oxygenated waters.
Range and habitat
Atlantic herring can be found on both sides of the ocean. They range, shoaling and schooling
across North Atlantic waters such as the Gulf of Maine
, the Gulf of St Lawrence
, the Bay of Fundy
, the Labrador Sea
, the Davis Straits
, the Beaufort Sea
, the Denmark Straits
, the Norwegian Sea
, the North Sea
, the Skagerrak
, the English Channel
, the Celtic Sea
, the Irish Sea
, the Bay of Biscay
and Sea of the Hebrides
. Although Atlantic herring are found in the northern waters surrounding the Arctic
, they are not considered to be an Arctic species.
The small-sized herring in the inner parts of the Baltic Sea
, which is also less fatty than the true Atlantic herring, is considered a distinct subspecies (''Clupea harengus membras'') ("Baltic herring"), despite the lack of a distinctive genome
. The Baltic herring has a specific name in many local languages (Swedish ''strömming'', Finnish ''silakka'', Estonian ''räim'', ''silk'', Livonian ''siļk'', Russian ''салака'', Polish ''śledź bałtycki'', Latvian ''reņģes'', Lithuanian s''trimelė'' and is popularly and in cuisine considered distinct from herring. For example, the Swedish dish surströmming
is made from Baltic herring.
Herrings reach sexual maturity when they are 3 to 5 years old. The life expectancy once mature is 12 to 16 years. Atlantic herring may have different spawning components within a single stock which spawn during different seasons. They spawn in estuaries, coastal waters or in offshore banks. Fertilization is external like with most other fish, the female releases between 20,000 and 40,000 eggs and the males simultaneously release masses of milt so that they mix freely in the sea. Once fertilized the 1 to 1.4 mm diameter eggs sinks to the sea bed where its sticky surface adheres to gravel or weed and will mature in 1–3 weeks, in 14-19 °C water it takes 6–8 days, in 7,5 °C it takes 17 days. It will only mature if its temperature stays below 19 °C. The hatched larvae are 3 to 4 mm long and transparent except for the eyes which have some pigmentation.
Herrings are most seen in the Nordic Atlantic Ocean, from the coast of South Carolina
until Greenland, and from the Baltic Sea until Novaya Zemlya
. In the North Sea
people can distinguish four different main populations. The different herring families are spawning in different periods:
* The Buchan-Shetland-herrings spawns in August and September near the Scottish and Shetland
* On the Dogger Bank
spawns the herrings from August until October.
* The more south population will spawn later, from November until January. These are the herrings from the Southern Bight of Downs.
* The Soused herring
spawns every spring in the Baltic Sea, and travels via Skagerrak to the North Sea.
These four populations lives outside of the spawn season interchangeably. In their spawn season, each population gathers together on their own spawn grounds.
In the past, there was another fifth distinct population, the Zuiderzee
herring who spawned in the formerly Zuiderzee. This population disappeared when the Zuiderzee was drained by the Dutch as part of the larger Zuiderzee Works
Herring-like fish are the most important fish group on the planet. They are also the most populous fish. They are the dominant converter of zooplankton
into fish, consuming copepod
s, arrow worms chaetognatha
, pelagic amphipods hyperiidae
s and krill
in the pelagic zone
. Conversely, they are a central prey item or forage fish
for higher trophic level
s. The reasons for this success is still enigmatic; one speculation attributes their dominance to the huge, extremely fast cruising schools
, seabirds, whale
s, squid, sea lions
, and fishermen
are among the predators of these fishes.
Herring's pelagic–prey includes copepod
s (e.g. Centropagidae
'' spp., ''Acartia
'' spp., ''Temora'' spp.), amphipod
s like ''Hyperia'' spp., larval snail
s by larvae below , peridinians, mollusc
an larvae, fish eggs, krill
like ''Meganyctiphanes norvegica
s, small fishes, menhaden
s by larvae below , Haplosphaera, ''Pseudocalanus''.
Atlantic herring can school
in immense numbers. Radakov estimated herring schools in the North Atlantic can occupy up to 4.8 cubic kilometres with fish densities between 0.5 and 1.0 fish/cubic metre, equivalent to several billion fish in one school.
Herring are amongst the most spectacular schoolers ("obligate schoolers" under older terminology). They aggregate in groups that consist of thousands to hundreds of thousands or even millions of individuals. The schools traverse the open oceans.
Schools have a very precise spatial arrangement that allows the school to maintain a relatively constant cruising speed. Schools from an individual stock generally travel in a triangular pattern between their spawning grounds, e.g. Southern Norway
, their feeding grounds (Iceland
) and their nursery grounds (Northern Norway). Such wide triangular journeys are probably important because feeding herrings cannot distinguish their own offspring. They have excellent hearing, and a school can react very quickly to evade predators. Herring schools keep a certain distance from a moving scuba diver or a cruising predator like a killer whale, forming a vacuole which looks like a doughnut from a spotter plane. The phenomenon of schooling is far from understood, especially the implications on swimming and feeding-energetics. Many hypotheses have been put forward to explain the function of schooling, such as predator confusion, reduced risk of being found, better orientation, and synchronized
hunting. However, schooling has disadvantages such as: oxygen- and food-depletion and excretion buildup in the breathing media. The school-array probably gives advantages in energy saving although this is a highly controversial and much debated field.
Schools of herring can on calm days sometimes be detected at the surface from more than a mile away by the little waves they form, or from a few meters at night when they trigger bioluminescence
in surrounding plankton
("firing"). All underwater recordings show herring constantly cruising reaching speeds up to per second, and much higher escape speeds.
Relationship with humans
The Atlantic herring fishery is managed by multiple organizations that work together on the rules and regulations applying to herring. As of 2010 the species was not threatened by overfishing
They are an important bait fish for recreational fishermen.
File:Purse seining for herring.jpg|
File:Harvesting herring with a purse seine.jpg|
File:Catch of Atlantic herring.jpg|
Because of their feeding habits, cruising desire, collective behavior and fragility they survive in very few aquaria
worldwide despite their abundance in the ocean. Even the best facilities leave them slim and slow compared to healthy wild schools.
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External linksInformation on FishbaseAtlantic herring
(Clupea harengus) pages on Gulf of Maine Research Institute
Category:Fish of the North Atlantic
Category:Fish of Europe
Category:Fauna of Atlantic Canada
Category:Fauna of the Northeastern United States