Chordata · chordates

Alaska pollock

Gadus chalcogrammus

Gadidae · codsIUCN: Near Threatened
Alaska pollock
Photo: Author not stated on Commons · Public domain · Wikimedia Commons · resized

Basis of one of the world's largest fisheries and the fish in most fish sticks.

Fun factImitation crab meat is usually made from it.

Waters
North Pacific
Depth zone
Continental shelf, Open-ocean surface waters
Diet
Krill & small fish
Size
Up to 90 cm

Classification

Chordata › Actinopterygii › Gadiformes › Gadidae

  1. Kingdom Animalia animals
    • Many-celled organisms that eat other living things for energy (heterotrophs)
    • Cells have no cell walls
    • Most can move at some stage of life
  2. Clade Bilateria bilateral animals
    • Body has a left and right side that mirror each other (bilateral symmetry)
    • Head end with concentrated nerves; three tissue layers
    • Includes about 99% of all living animal species
  3. Clade Deuterostomia deuterostomes
    • In the embryo, the first opening becomes the anus and the mouth forms second
    • Includes echinoderms and chordates
  4. Phylum Chordata chordates
    • At some stage of life: a stiffening rod along the back (notochord)
    • A hollow nerve cord along the back (dorsal)
    • Slits in the throat (pharyngeal slits) and a tail past the anus
  5. Subphylum Vertebrata vertebrates
    • A skull (cranium) protecting a brain
    • Backbone or similar support around the nerve cord
    • Includes fishes, amphibians, reptiles, birds, and mammals
  6. Infraphylum Gnathostomata jawed vertebrates
    • Jawed vertebrates: jaws formed from gill arches
    • Paired fins or limbs
    • Includes all fishes except hagfish and lampreys, plus all tetrapods
  7. Superclass Osteichthyes bony vertebrates
    • Bony vertebrates: skeleton made largely of bone
    • Most have a lung or swim bladder
    • Includes ray-finned and lobe-finned fishes and all tetrapods
  8. Class Actinopterygii ray-finned fishes
    • Ray-finned fishes: fins are webs of skin held up by thin bony rays
    • Usually a gas-filled swim bladder for buoyancy
    • About half of all vertebrate species
  9. Infraclass Teleostei teleost fishes
    • Teleosts: symmetrical tail fin
    • Jaws that can push forward to grab prey (protrusible)
    • About 96% of all living fishes
  10. Cohort Euteleostei salmon, cod, perch & kin
    • A huge group that includes salmon, cod, and all spiny-finned fishes
  11. Clade Acanthomorpha spiny-rayed fishes
    • Spiny-rayed fishes: true spines in the front of the fins
    • Includes most familiar marine fishes
  12. Order Gadiformes cods & hakes
    • Cods and hakes: fins with soft rays only, no spines
    • Often a chin barbel; pelvic fins set far forward
  13. Family Gadidae cods
    • Cods: most have three dorsal fins and two anal fins
    • Often a single chin barbel
  14. Genus Gadus
    • Species in the same genus are very close relatives and often look alike.
  15. Species Gadus chalcogrammus Alaska pollock

Closest relatives in the guide