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'Cool water' fish are being overtaken by 'warm water' fish.

'Cool water' fish are being overtaken by 'warm water' fish.

IMAGE: Gretchen Hansen “The rate of increase in air temperature has accelerated in recent decades, and this increase in air temperature will affect the thermal habitat for fishes across the region,” Wagner said. “Temperatures are projected to continue increasing across the Midwest — with the greatest increases in average temperature expected in northern areas — so we wanted to know what was happening with walleye populations in the upper Midwest.” Using data provided by the Minnesota and Wisconsin departments of Natural Resources, researchers quantified annual walleye early-life ...

IMAGE: Gretchen Hansen “The rate of increase in air temperature has accelerated in recent decades, and this increase in air temperature will affect the thermal habitat for fishes across the region,” Wagner said. “Temperatures are projected to continue increasing across the Midwest – with the greatest increases in average temperature expected in northern areas – so we wanted to know what was happening with walleye populations in the upper Midwest.” Using data provided by the Minnesota and Wisconsin departments of Natural Resources, researchers quantified annual walleye early-life g...