Abstract

Do you like to eat salmon? If so, you’re not alone. European catfish, a large freshwater fish introduced into Europe for sport fishing, has also developed a taste for it. We wanted to know what happens when salmon and catfish meet in rivers that humans have changed (for instance: by building a power plant). We picked a big river with a power plant, the Garonne in South-West France, to address this question. With the help of video and acoustic cameras in a special waterway for fish around the power plant, as well as radio-transmitters attached to individual fish, we can confidently say that catfish prey on salmon in these altered parts of the river. In fact, they seem to even shift the time they’re active (from night time to more daylight hours) to increase their chances of catching salmon. And while salmon populations are declining in Europe, catfish seem to be doing better and better.

Share this article

Share on facebook
Share on twitter
Share on linkedin
Share on whatsapp
Share on email

Downloads

Additional languages
Click for other articles in .
Other recommended resources
Opening video(s)

About this article

Summary of research
Scientists wanted to know if catfish prey on salmon in rivers that humans have altered.
Reading level
Scientific field
Key words
Scientific methods
Type of figure
AP Environmental science topics
IB Biology topics
Location of research
Scientist Affiliation
Publication date
June 2018

Looking for something else?