Recently, it has been observed that the female adult sockeye from the Fraser River are dying at a significant rates than the males, when they journey back to their spawning grounds.
Researcher Dr. Scott Hinch, a professor in the faculty of forestry and head of the Pacific Salmon Ecology and Conservation Laboratory at University of British Columbia, said that this effect is causing skewed sex ratios in their spawning grounds. Professor Hinch, identified that combination of environmental stressors could have triggered this. He further explains series of conditions attached to this. They could result from: when the water is too warm; when there is too much turbulence; when the fish have been handled or released from capture. The impacts of stressful events in females are higher than when compared to males.
For more information on the news visit this link:
Image credit: Alex Mustard