Scrounging food from friends

Salmon Coast researchers and collaborators have documented “scrounging” behaviour in juvenile coho salmon, where coho will steal prey from a conspecific (fish of the same species) rather than capture their own. The observational study revealed that mainly large coho scrounge from small coho, which inspired a game-theory model for how body size can influence optimal foraging strategies in groups.

Here is a video of the behaviour:

Check out the article and data published in Theoretical Ecology.

Phillips, JA, SJ Peacock, AW Bateman, M Bartlett, MA Lewis and M Krkošek. An asymmetric producer-scrounger game: body size and social foraging behavior of coho salmon. Theoretical Ecology. doi: 10.1007/s12080-018-0375-2 *Joint first authors.