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Alaska pollock

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Content Overview of Alaska pollock

History of Alaska pollock

images of alaska pollockWhile belonging to the same family as the Atlantic pollock, the alaska pollock is not a member of the same pollachius genus. The alaska pollock or walleye pollock (Gadus chalcogrammus) may be a marine fish species of the cod family Gadidae. it’s a semipelagic schooling fish widely distributed within the north pacific with largest concentrations found in the eastern sea.

Theragra chalcogramma was long place in its own genus Theragra and classified Theragra chalcogramma, however newer research has shown it’s rather closely related to the atlantic cod and will be affected back to genus gadus during which it was originally described.

Distribution and habitat

Alaska pollock is a saltwater fish that thrives in seas, oceans, and gulfs. widely distributed in the temperate to boreal Pacific Ocean, from Central california into the eastern bering sea, along the aleutian arc, around Kamchatka, in the Okhotsk sea and into the southern sea of Japan.

Alaska pollock are found in the north pacific Ocean. In U.S. waters, the largest population, and hence the most important fishery, is in the eastern bering sea. These fish, semi-demersal in some regions and water in others, are ready to survive in massive estuaries, coastal areas, and open basins. Theragra chalcogramma are restricted to northern regions reflective this species’ restricted temperature tolerance. The thermal vary of those fish decreases with age. Younger fish have a larger vary of temperature tolerance than older fish, that stay at lower depths wherever the temperature could be a constant one to six degrees uranologist.

Alaska pollock characteristics

Scientific Name: Theragra chalcogramma
Lifespan: 17 – 28 years
Origin: eastern Bering Sea
Common Names: Alaska pollock, walleye pollock, Gadus chalcogrammus
Size: 20 inches (51 cm)
PH: 7.5–8.0
Temperature: N/A
Water Hardness: N/A
Fish type: N/A 
Aquarium Size: N/A
Tank Mates: Many, given their peaceful nature.
Gender:

Lifecycle of Alaska pollock

alaska pollock whitefishPollock are schooling, midwater to bottom-dwelling fish, living anywhere between shallow, nearshore waters to 1000 m. Theragra chalcogramma usually lives from 12 to 16 years. The oldest alaska pollock ever reported was 31 years old

Males and females are outwardly indistinguishable and generally begin to breed at 3-4 years getting on. Spawning happens at totally different seasons relying upon location; in Alaska between March and will. Females spawn in many batches over many weeks, manufacturing up to a pair of million tiny eggs. The eggs hatch in 1-3 weeks at the depth of spawning (usually 100-250 m), and larvae develop in shallow water. Older fish consume copepods, shrimp, euphausiids, and fish.

Alaska pollock Temperament / Behavior

Alaska pollock is a mobile species that’s social and travels in schools. Depth, temperature, and cold fronts contribute to the vertical distribution of juvenile Theragra chalcogramma. To maximize their chances of survival, the larger cluster will increase their calorie intake to realize weight in fall, whereas the smaller cluster focuses alone on growing in size. These factors conjointly impact the horizontal distribution of adult schools, that typically keep within a spread of zero to two degrees Celcius. At night, juvenile fish is found close to the surface, indicating their distinctive eating pattern.

In August, once food is abundantly available close to the surface, pollocks are found at lower depths, however in Nov, they’re found at bigger depths along side their being food supply.

How to take care?

Feeding for Alaska pollock

images of alaska pollockAlaska pollock feeds on each fish and invertebrates. In winter, adult pollock feed mostly on fishes and euphausiid krill. In summer, the diet consists of euphausiids and copepods and in autumn, they feed on mainly euphausiids. Smaller-sized individuals are more likely to consume copepods and euphausiids.

Health and Diseases:

Best food for Alaska pollock fish:

Zooplankton (food for alaska pollock larvae), euphausiid krill, tunicates, copepods, shrimp, small pollock. The diet of this fish varies by developmental stage, season, and body size. Larvae tend to consume zooplankton such as larval copepods, while older T. chalcogramma tend to eat larger food items such as adult Acartia and Pseudocalanus. Theragra chalcogramma have a diet rich in small pollock (specifically in the eastern bering Sea) and shrimp.

Alaska pollock Fish for sale

Alaska pollock Fish Price

Fish box price

Photo of Alaska pollock fish

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Read  Also :  Grey Mullet Fish

Reference : Wikipedia

animaldiversity.org

fao.org

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