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Pollachius virens, commonly known as Saithe or Pollock, is a commercially important marine fish belonging to the cod family, Gadidae. It is characterized by its streamlined body, dark coloration, and a distinctive pale lateral line. This species is a fast-swimming, schooling fish that inhabits cold to temperate waters of the North Atlantic.
Fysiske karakteristika
- Kropsform
- torpedo
- Farvetegning
- Dorsal side is typically dark greenish-brown to black, fading to a silvery-grey on the flanks and a white belly. The coloration can vary slightly with habitat depth and diet.
- Skæltype
- cycloid
- Mundens placering
- terminal
- Kendetegn
- Straight, pale lateral line that is distinctly lighter than the body color and does not curve significantly over the pectoral fin., Absence of a barbel on the chin (unlike Atlantic Cod or Haddock)., Three dorsal fins and two anal fins, characteristic of the Gadidae family., Large eyes relative to head size., Slightly protruding lower jaw.
- Rygfinne
- Three distinct dorsal fins. The first dorsal fin is short, the second is longer, and the third is the longest, tapering towards the caudal fin.
- Halefinne
- Forked caudal fin, indicative of a fast-swimming pelagic species.
- Brystfinne
- Relatively large and pointed pectoral fins, positioned low on the body.
- Karakteristiske finner
- Two distinct anal fins, mirroring the shape and position of the second and third dorsal fins.
Identifikationstips
Lateral Line
The most reliable distinguishing feature is the straight, pale lateral line, which contrasts sharply with the dark body color. This line does not curve upwards over the pectoral fin, unlike Atlantic Cod.
Chin Barbel
Absence of a chin barbel. This immediately differentiates it from Atlantic Cod (which has a prominent barbel) and Haddock (which has a small barbel).
Coloration
Generally darker overall body color (dark green to black dorsally) compared to the mottled brown/green of Atlantic Cod or the silvery-grey of Haddock with its distinctive black spot.
Body Shape
More streamlined and torpedo-shaped than the more robust, deeper-bodied Atlantic Cod.
Habitat
- Vandtype
- saltwater
- Dybde
- Typically found in depths ranging from 0 to 200 meters, but can occur down to 300 meters. Juveniles are often found in shallower coastal waters and estuaries.
- Miljø
- Demersal to semi-pelagic, inhabiting both offshore banks and coastal areas. Prefers rocky bottoms, kelp beds, and areas with strong currents. Forms large schools.
- Geografisk udbredelse
- North Atlantic Ocean, including the waters off Greenland, Iceland, Norway, the Barents Sea, the North Sea, and along the eastern coast of North America from Newfoundland to Cape Hatteras.
Akvarieoplysninger
- Plejeniveau: expert
- Temperament: aggressive
- Kost: carnivore
- Minimum akvariestørrelse: Not suitable for home aquaria due to size and schooling behavior; requires vast public aquarium systems.
- Temperatur: 4-10°C (39-50°F)
- pH-niveau: 7.8-8.4
- Hårdhed: High (marine salinity)
- Kompatibilitet: Only with very large, robust marine species in extremely large, specialized exhibits. Highly predatory.
- Særlige krav: Requires immense tank volume, strong filtration, significant water flow, and a constant supply of live or fresh dead prey. Not a species for typical aquarists.
Information om vilde bestande
- Bevaringsstatus: least concern
- Sæson: Available year-round, with peak fishing seasons varying by region, often in late autumn and winter when they aggregate for spawning or feeding.
- Markedspris: Varies significantly by region and processing (fresh, frozen, smoked, salted). Generally a more affordable whitefish than cod or haddock.
- Kommerciel betydning: high
- Smag: Mild, slightly sweet, and savory.
- Konsistens: Firm, flaky, and moist, holding together well when cooked.
- Tilberedningsmetoder: Baking, Frying, Grilling, Poaching, Smoking, Salting
- Næringsværdi: Excellent source of lean protein, Omega-3 fatty acids, Vitamin B12, selenium, and phosphorus.
Nøglefakta
Fast Swimmerbehavior
Saithe are known for their powerful swimming abilities and streamlined bodies, allowing them to pursue prey efficiently in open water.
Schooling Behaviorbehavior
This species forms large, dense schools, especially during feeding and spawning aggregations, which makes them a target for commercial fisheries.
Dietary Shiftbehavior
Juvenile Saithe primarily feed on crustaceans, while adults transition to a piscivorous diet, preying on smaller fish like herring, capelin, and sand eels.
Longevityrecord
Saithe can live for up to 25-30 years, reaching sexual maturity around 4-6 years of age.
Misnomerinteresting
Despite often being called 'Pollock', Pollachius virens is distinct from the Walleye Pollock (Gadus chalcogrammus) found in the Pacific, though both are members of the cod family.
Sikkerhedsoplysninger
Sikker- Sikkerhedsniveau: safe
- Giftig: Nej
- Spiselighed: edible
- Håndteringsnoter: No specific handling precautions are required beyond standard fish handling practices to avoid fin pricks or slips. Not venomous or dangerous.
Lignende arter
Atlantic Cod
Gadus morhua
Atlantic Cod has a prominent chin barbel, a mottled brown/green coloration, and a lateral line that curves distinctly upwards over the pectoral fin. Its body is also generally deeper and less streamlined.
Haddock
Melanogrammus aeglefinus
Haddock has a small chin barbel, a distinctive black 'thumbprint' spot above the pectoral fin, and a dark, curved lateral line. Its overall coloration is typically silvery-grey with a darker back.
Walleye Pollock
Gadus chalcogrammus (formerly Theragra chalcogramma)
Walleye Pollock is found in the North Pacific and has a less distinct lateral line, often with a greenish hue. While also lacking a chin barbel, its geographic distribution is a key differentiator.
Videnskabelig klassifikation
- Rige
- Animalia
- Række
- Chordata
- Klasse
- Actinopterygii
- Orden
- Gadiformes
- Familie
- Gadidae
- Slægt
- Pollachius
- Art
- Pollachius virens
Udforsk Saithe
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