The amount of fish in the oceans has halved since 1970, in a plunge to the “brink of collapse” caused by over-fishing and other threats, the WWF conservation group said last week.
Populations of some commercial fish stocks, such as a group including tuna, mackerel and bonito, had fallen by almost 75 percent, according to a study by the WWF and the Zoological Society of London (ZSL).
The report said populations of fish, marine mammals, birds and reptiles had fallen 49 percent between 1970 and 2012. For fish alone, the decline was 50 percent. The analysis tracked 5,829 populations of 1,234 species, such as seals, turtles and dolphins and sharks. The ZSL data sets were almost twice as large as past studies.
“This report suggests that billions of animals have been lost from the world’s oceans in my lifetime alone,” Ken Norris, director of science at the ZSL, said in a statement. “This is a terrible and dangerous legacy to leave to our grandchildren.”
Damage to coral reefs and mangroves, which are nurseries for many fish, add to problems led by over-fishing. Other threats include coastal development, pollution and climate change, which is raising temperatures and making waters more acidic.
The study said the world’s fishing fleets were too big and supported by subsidies totaling $14-35 billion a year.
RE-post ~ Ocean fish on brink of collapse: WWF | Planet Ark
