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GRANITE CITY, MO (KTVI) – Something smells fishy around one local lake literally. Horseshoe Lake near Granite City, Illinois is seeing an increase in fish kill. Local residents want to know if they should be concerned. Park officials think not. IDNR Fisheries biologists report the dead fish are likely succumbing to a low level of dissolved oxygen in the lake. The dissolved oxygen depletion is a natural occurrence related to recent cooler weather, which caused a kill of algae blooms in the lake water. The algae bloom kill depletes the oxygen in the water and some fish don’t survive. It appears most of the fish affected are Asian carp. These fish are unwanted visitors, as they are invasive and often dangerous. The fish kill may create quite a stench and eyesore, but park officials encourage visitors to not be alarmed.