Pink salmon threatened by freshwater acidification
![pink salmon](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/06/wt_salmon_free.jpg?fit=860%2C460&ssl=1)
Adult male pink salmon develop a hump on their back during their spawning migration. New research indicates that, under higher levels of atmospheric carbon, fewer fish may reach this stage of life.
Brent M./Flickr (CC-BY-NC-SA 2.0)