Fisheries managers and researchers may now predict how early fish will spawn in response to warming waters due to climate change, both in the oceans and in freshwaters.
A new report by leading fisheries experts found that over 99 percent of bottom trawling worldwide occurs inside the Exclusive Economic Zones of coastal nations—with much of the effort focused within just 12 miles of shore— posing risks to critical habitats and traditional, small-scale, artisanal fishing operations. As the only globally significant fishing practice that requires sustained contact with the seabed, bottom trawling has a uniquely high impact, one that can drive habitat destruction, coastal conflict and major fuel-related carbon emissions.Continue reading
Discounting anthropogenic-induced changes, the seasonally oscillating environments where long-lived fish hatch and grow remain more or less the same throughout the course of their lives. This means that the common explanation that states that fish become sexually active – or spawn for the first time – after experiencing certain environmental stimuli does not properly explain this phenomenon.
A simple fish stock assessment model applied to over 500 years of catch data demonstrated that if Canadian authorities had allowed for the rebuilding of the stock of northern Atlantic cod off Newfoundland and Labrador in the 1980s, annual catches of about 200,000 tonnes could have been sustained.Continue reading