By Douglas Maine, December 6th, 2013 Livescience.com
Ocean acidification threatens to make fish, like this juvenile rockfish, more anxious.
Credit: Scripps Institution of Oceanography
Ocean acidification, which is caused by rising levels of carbon dioxide in the atmosphere being absorbed into the sea, has made many worry because of the problems it will likely create, such as a decline in shellfish and coral reefs. But humans may not be alone in their anxiety: Ocean acidification threatens to make fish more anxious as well (and not because they are reading about ocean acidification on LiveScience.com. At least so far as we know.)
A new study found that after being placed for a week in an aquarium with acidic seawater — as acidic as the oceans are expected to be on average in a century’s time — juvenile rockfish spent more time in a darkened corner, a hallmark of fish anxiety, and the same behavior exhibited by fish given an anxiety-inducing drug.
“They behaved the same way as fish made anxious with a chemical,” said Martin Tresguerres, a marine biologist at the Scripps Institution of Oceanography at the University of California, San Diego.