Let’s be clear up front: Fisheries scientists say there are many factors that may be affecting the walleye population in lakes like Mille Lacs. Overfishing, invasive species like zebra mussels and increased predators feeding on young walleyes may all play a role.
That said, big, shallow lakes like Mille Lacs are a special laboratory for Minnesota’s warming climate. They can be more sensitive to temperature changes than deeper lakes. There’s also evidence that some fish that are critical food for walleye, like the cisco, are very sensitive to warmer water in summer.
To read the entire article, please click on this link http://www.mprnews.org/story/2016/03/25/climate-cast-fishing