Salmon living in tanks with darker backgrounds are typically less aggressive than those living in a lighter coloured environment, according to new research.
The researchers divided 100 Coho Salmon into 10 different tanks, each with different colour patterns, and monitored their behaviour. They found that the salmon prefered the darker areas, and were less aggressive overall when in a dark tank.
Salmon were also less aggressive in tanks having both a light area and a dark refuge.
The researchers hope their findings will be used in aquaculture to provide welfare benefits to salmon living in artificially created environments.
Original research paper published in PLOS ONE on March 30, 2015.
Names and affiliations of selected authors
Marina A. G. von Keyserlingk, Animal Welfare Program, Faculty of Land and Food Systems, University of British Columbia, British Columbia