The Iowa City Parks and Recreation Department has received reports of dead fish spotted in local bodies of water as the ice cover disappears following warmer temperatures. This winterkill occurs when ice barriers form on the surface of lakes and ponds, preventing oxygen circulation.
Iowa's winter weather included an accumulation of ice, blanketed by snow, which covered bodies of water for an extended period, and blocked crucial sunlight. This scenario impedes photosynthesis, which can cause aquatic plant life to die. The loss of aquatic plants results in less oxygen under the icy...