The warming is expected to reduce the amount of time cold water fish spend in the southern basin of Lake Michigan, where the chance of catching these species is already limited because it’s shallower and more tepid than the rest of the lake. Now, much of the lake is so deep and cold in open water that most fish can’t survive there, but warming will likely open up more habitat for the majority of fish, Hook said. However, whether they will be able to find sufficient food in those new waters is unclear.