Why Are So Many Farmed Salmon Partially Deaf?

Researchers have found out the reason that so many farm-raised salmon are partially deaf, pointing to a deformity in their ears caused by accelerated growth in aquaculture. The findings raise significant welfare issues and may also explain the poor survival of farmed hatchlings in conservation programs. University of Melbourne scientists looked at salmon farmed in Norway, Chile, Scotland, Canada, and Australia and found the deformity was widespread. The study’s lead author, Tormey Reimer, a master’s graduate from the School of BioSciences at the University of Melbourne, says when they went looking for the cause of the deformity they found that the fastest-growing fish were three times more likely to be afflicted than the slowest, even at the same age. [Read More]