For years, biologists have been working to improve conditions for the native fish in Lake Champlain. Among other things, they have removed old dams to help spawning salmon migrate up rivers and have reduced the population of sea lampreys that prey on salmon and lake trout.
Now scientists are trying to fully understand how salmon are impacted by alewives, an invasive species that has become a main source of food for salmon, a keystone predator that eats smaller fish.
Alewives were first discovered in Lake Champlain’s Missisquoi Bay, in Vermont, in 2003. Since then, they have grown in number and replaced native rainbow smelt as the main forage fish for predators in the lake, and they are likely here to stay. » Continue Reading.