Overview
AT A GLANCE
- Common Name: Pollock
- Scientific Name: Pollachius pollachius
- Category: Fish
- Subcategory: Ray-finned Fish
- Size: 60 to 90 cm (23.6 to 35.4 in); maximum recorded up to 130 cm (51.2 in)
- Weight: 3 to 8 kg (6.6 to 17.6 lb); maximum recorded up to 18 kg (40 lb)
- Lifespan: 10 to 15 years
- Diet: Active predatory piscivore; sandeels, sprats, juvenile cod, herring, capelin, squids, and swimming crabs
- Habitat: Rocky coastal reefs and deep underwater wrecks from the surface down to depths of 200 meters (650 ft)
- Range: Northeast Atlantic Ocean, from northern Norway and Iceland south throughout the North Sea, the English Channel, and the Bay of Biscay to Portugal
- Conservation Status: Least Concern
The Pollock (Pollachius pollachius), also widely known in European waters as the Pollack or Lythe, is a sleek, powerful predatory marine fish belonging to the cod family Gadidae. Endemic to the cold, wave-swept coastal waters of the northeastern Atlantic Ocean, this athletic gadid rules the swirling currents around underwater shipwrecks, sheer drop-offs, and towering kelp forests from the Arctic Circle in Norway south to Portugal.
Ecologically, Pollachius pollachius is a dominant mid-water and benthic predator, playing a key role in structuring coastal reef communities by hunting schools of sandeels, sprats, and small pelagic fishes. Unlike its opportunistic bottom-scavenging cousin the cod, the Pollock is a visual, high-speed hunter that patrols vertical rock faces and surface boils. It sustains valuable coastal artisanal fisheries and is celebrated as one of the most thrilling sportfish accessible to sea anglers along the Atlantic coast.
Biology and Physical Characteristics
The morphology of Pollachius pollachius features an elongated, gracefully streamlined body with a pointed head and an aggressively projecting lower jaw that extends well past the upper jaw. Its coloration is olive-brown to dark green on the back, shading into warm golden-bronze flanks and an off-white belly. Unlike the closely related Saithe (Pollachius virens), which has a straight white lateral line, the Pollock is characterized by a distinctive, dark greenish lateral line that curves smoothly downward above the pectoral fin. The chin barbel is completely absent or reduced to a microscopic vestige in adults, reflecting its reliance on acute visual targeting rather than benthic barbel probing. It possesses three separate soft-rayed dorsal fins and two anal fins.
Behavior and Ecology
Young pollock spend their first two to three years schooling in sheltered shallow kelp beds, sea lochs, and rocky harbors, feeding on mysids and small crustaceans. As they mature, adults move to deeper offshore waters, aggregating in loose shoals around deep-water wrecks, submerged reefs, and headlands where tidal races concentrate baitfish. Spawning takes place in late winter and spring at depths of 100 meters, with females broadcasting up to 4 million pelagic eggs that drift with coastal currents. Hunting pollock frequently herd schools of sandeels to the surface, creating frenzied feeding boils that attract diving seabirds.
Conservation and Human Impact
Currently assessed as Least Concern by the IUCN, the Pollock is subject to active commercial fisheries management under the European Union Common Fisheries Policy. In recent years, fisheries scientists have advised strict landing quotas to prevent localized overfishing in the Celtic Sea and English Channel, promoting sustainable hook-and-line artisanal capture over destructive commercial gillnetting.
Interesting Factoid
Unlike almost all other members of the cod family that have a sensory whisker barbel on their chin to feel the muddy sea floor, the Pollock has completely lost its barbel, having evolved into an athletic, visual hunter that ambushes prey in mid-water currents.