Bravery may cost fish their lives

phys.org | 5/4/2017 | Staff
itsdonaldk (Posted by) Level 3
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Fish that show bravery often become prey themselves, whereas shyer individuals survive to a greater extent. Researchers at Lund University in Sweden have now successfully established a connection between bold personalities and the risk of being killed by a predator in the wild.

The researchers marked common roaches, a widespread freshwater fish, and studied their personalities. After investigating which individuals then became food for cormorants, the biologists at Lund University were able to show that the bravest fish run twice the risk of being eaten compared to the shyest individuals.

Roaches - Beings - Individuals - Personalities - Traits

Common roaches, just like human beings, are individuals with different personalities and traits. One of these is courage—and not all common roaches are equally bold.

For a long time, researchers have assumed that the inclination to expose oneself to risks is a compromise between the actual risk itself and any associated consequences on the one hand, and the potential reward on the other. Boldness and the willingness to take major risks are thus a strategy which can lead to something really tasty to eat or a partner with whom to mate. But it can also end badly.

Research - Findings - Populations - Assumption - Biologists

Until recently, there have only been a few research findings from wild populations to support this assumption. That is, until now, when the biologists studied personalities among common roaches in Krankesjön lake in southern Sweden.

Captured common...
(Excerpt) Read more at: phys.org
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