Webpages tagged with «Fishing effect»

Atlantic cod in the Oslofjord have been declining for years, leading the Norwegian government to close large parts of the fjord to fishing from 2026. However, few quantitative estimates of how much the population had fallen have been available. A recent study (Langangen et al. 2026) from the Department of Biosciences at UiO addresses that gap.

High fishing pressure tends to lead to proportionally fewer old and large individuals in fish stocks. It is feared that these demographic changes make the fish stocks more sensitive to climate variability and change. Statistical analysis of long-term survey data on cod eggs throws new light on the possible mechanisms.