Atlantic Cod

It is widely regarded as one of the most dramatic fisheries collapses in modern history. The Grand Banks cod stock off Newfoundland had sustained fishing fleets for roughly 500 years and once supported catches of hundreds of thousands of tonnes annually, but the arrival of large, highly efficient industrial trawlers in the mid-20th century dramatically increased fishing pressure, and by 1992 the stock had crashed to a small fraction of its historic size. Canada's federal government declared an emergency moratorium on cod fishing that year, putting an estimated 30,000 to 40,000 people out of work almost overnight and permanently transforming the region's economy and communities.

Recovery has been slow and uneven across different regions. Some cod stocks, particularly in parts of the northeastern Atlantic managed under strict international quotas, have shown meaningful rebuilding over the following decades, while the core Grand Banks and Gulf of St. Lawrence stocks off Canada remain far below their historic abundance more than 30 years after the moratorium began. Scientists point to several compounding factors behind this slow recovery, including cod's relatively slow growth and late maturity, ongoing predation and competition from other species that expanded while cod numbers were low, and continued bycatch in fisheries targeting other species.

Its firm, mild-flavoured flesh could be preserved for long periods by salting and drying, which was crucial in an era before refrigeration and made it an ideal trade good that could be transported over long distances without spoiling. Dense, easily accessible cod stocks off Newfoundland and New England helped draw early European fishing expeditions to North America, and the resulting salt cod trade became a foundation of colonial economies across the North Atlantic, connecting European, Caribbean, and North American markets for centuries before the stock's eventual collapse under sustained fishing pressure.

The single fleshy, whisker-like barbel hanging beneath a cod's chin is densely packed with taste buds and other sensory cells, functioning much like an extra hand for finding food in dark or murky water where eyesight alone is unreliable. As the cod swims close to the seafloor, it trails the barbel across sand, mud, or gravel, using it to detect the taste and texture of buried or hidden prey such as worms, small crustaceans, and other invertebrates before attempting to dig them out and eat them, a sensory adaptation shared with several other bottom-feeding fish species.