Associated Press, Published May 24 2013
Winterkill in North Dakota lakes not extremeBISMARCK — North Dakota wildlife officials say some lakes in the state suffered winterkill but that the problem of fish die-offs was not extreme, despite the prolonged winter.
Game and Fish Department fisheries official Scott Gangl says about 30 winterkills have been confirmed so far. He says the majority are considered minor or partial kills, meaning there is still fish to catch in those lakes.
Some lakes did suffer significant winterkills, however.
Winterkill happens when heavy snowfall blocks sunlight from going into lakes. Plants die and stop giving off oxygen, and they also consume oxygen as they decompose. That limits oxygen available for fish.
Game and Fish says all lakes affected by winterkill will be restocked.