Atlantic cod can live for up to 25 years and typically grow up to 100–140 cm (40–55 in), but individuals in excess of 180 cm (70 in) and 50 kg (110 lb) have been caught.[11][12] They will attain sexual maturity between ages two and eight with this varying between populations and has varied over time.[13][14]
Colouring is brown or green, with spots on the dorsal side, shading to silver ventrally. A stripe along its lateral line (used to detect vibrations)[15] is clearly visible. Its habitat ranges from the coastal shoreline down to 300 m (1,000 ft) along the continental shelf.
Atlantic cod is one of the most heavily fished species. Atlantic cod was fished for a thousand years by north European fishers who followed it across the North Atlantic Ocean to North America. It supported the US and Canada fishing economy until 1992, when the Canadian Government implemented a ban on fishing cod.
Several cod stocks collapsed in the 1990s (decline of more than 95% of maximum historical biomass) and have failed to fully recover even with the cessation of fishing.[16] This absence of the apex predator has led to a trophic cascade in many areas.[16] Many other cod stocks remain at risk. The Atlantic cod is labelled vulnerable on the IUCN Red List of Threatened Species, per a 1996 assessment that the IUCN notes needs updating.[2] A 2013 assessment covering only Europe shows the Atlantic cod has rebounded in Europe, and it has been relabelled least concern.[17]
^ abOxford English Dictionary, 3rd ed. "milwell, n." Oxford University Press (Oxford), 2002.
^Oxford English Dictionary, 3rd ed. "morhwell, n." Oxford University Press (Oxford), 2002.
^Richardson, John (1836), "93. Gadus Morrhua. (Auct.) Common Cod-fish", Fauna Boreali-Americana; or the Zoology of the Northern Parts of British America: Containing Descriptions of the Objects of Natural History Collected on the Late Northern Land Expeditions under Command of Captain Sir John Franklin, R.N., vol. III: The Fish, London: Richard Bentley, pp. 242–245.
^Riley, Henry Thomas, ed. (1860), "Glossary of Mediæval Latin", Munimenta Gildallæ Londoniensis: Liber Albus, Liber Custumarum, et Liber Horn, vol. II, Part II., containing Liber Custumarum, with extracts from the Cottonian MS Claudius, D. II., London: Eyre & Spottiswoode for Her Majesty's Stationery Office, p. 816.
^ abcOxford English Dictionary, 3rd ed. "green fish, n." Oxford University Press (Oxford), 2011.
^C.Michael Hogan, (2011) Sea of the HebridesArchived May 24, 2013, at the Wayback Machine. Eds. P. Saundry & C.J.Cleveland. Encyclopedia of Earth. National Council for Science and the Environment. Washington DC.