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New study finds cod are shrinking from overfishing The shrinking of the cod, as well as the decline in its population, is due to decades of intensive fishing combined with environmental changes (Thorsten Reusch GEOMAR) (CN) — Intensive fishing caused the once-mighty cod to shrink by roughly half its size between 1996 and 2019, according to a new paper, published Wednesday in Science Advances
Overfishing has caused cod to halve in body size since… - inkl The scientists combined annual growth data with the cods’ body size metrics and genetics to assess whether there had been a genetic shift in the population over 25 years under fishing pressure Between 1996 and 2019, the median length of a mature cod in the dataset fell from 40cm to 20cm
Overfishing has caused cod to halve in body size since 1990s . . . A study found that intensive fishing has driven rapid evolutionary changes in eastern Baltic cod, causing their average body length to halve from 40cm in 1996 to 20cm in 2019 This 'shrinking' has a genetic basis, as larger individuals were consistently removed, giving smaller, faster-maturing fish
Genomic evidence for fisheries-induced evolution in Eastern . . . Rapid evolutionary changes caused by anthropogenic pressures, e g , overfishing, pose special challenges in detecting induced selection processes, as the changes usually span a relatively short time frame (corresponding to a few fish generations) insufficient for a conventional sweep-like pattern caused by the complete fixation of focal alleles