Alaska's waterways are under attack by an unexpected invader: the northern pike. This razor-toothed predator is secretly moving between freshwater ecosystems, decimating native fish populations.

Researchers studying pharmaceutical pollution tracked salmon that had been exposed to anti-anxiety medication. The fish appeared to lose their inhibitions.

In a study in Sweden’s River Dal, researchers found that exposure to the anti-anxiety drug clobazam improved juvenile ...

"Even large fish, too large to be eaten by predators such as bass and pike, experience a death rate of approximately 50% per year. "Fortunately, the deaths are usually spread-out over the year and ...