A newly developed method for assessing how abundant fish populations are and how fishing is affecting them revealed that several fish stocks across oceans are far below internationally agreed minimum levels and in urgent need of sustainable management.
Fish that are highly valued by Chinese consumers, such as largehead hairtail, would grow in value and in the amounts that are caught if industrial fisheries increased the mesh size of their nets.
New research by the Sea Around Us initiative at UBC’s Institute for the Oceans and Fisheries found that trawlers operating in China’s coastal waters are overfishing 21 economically important species because the mesh size is so small that, together with large, desirable fish, undersized fish are also getting caught. This means that fish are being taken out before they are able to reproduce.
Smaller fish and invertebrates, such as gazami crab or Japanese sardinella, are replacing larger, more commercially valuable fish such as largehead hairtail in the Bohai Sea in northeastern China.
A new study by scientists with the Chinese Academy of Sciences and the Sea Around Us initiative at the University of British Columbia’s Institute for the Oceans and Fisheries shows that industrial fisheries have severely affected food webs in the Bohai Sea, with organisms that occupy lower levels in the food web becoming more common than larger predators.
How much have humans affected the population of other species on the planet? A new methodology for documenting the cumulative human impacts on biodiversity aims to answer this question.
Dubbed EPOCH -for Evaluation of Population Change- the methodology was developed by a group of scientists from universities in Europe, Asia, and North America. It provides a standardized framework for organizing disperse data on individual species or populations of animals and plants that have been affected by urbanization, pollution, fishing, hunting, over-harvesting, and other anthropogenic activities.
The Gill-Oxygen Limitation Theory, known as GOLT, explains the biological reasons that force fish, particularly larger or older ones, to move poleward when the waters in their habitats heat-up due to climate change.