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What Type of Lake Do You Live By There are three basic types of lakes found in Ontario.You can learn more about your lakes unique characteristics by contacting your local Conservation Authority Ontario Ministry of Natural Resources and Forestry MNRF or cottage association. Oligotrophic Lakes Generally deep Minimal aquatic plant growth Low nutrient levels Support cold-water fish such as trout and whitefish Low levels of phosphorus and chlorophyll Most lakes on the Canadian shield are oligotrophic with some exceptions Mesotrophic Lakes Medium depth Usually good for fishing support a wide variety of fish such as walleye and bass More nutrients than oligotrophic lakes but not nearly as much as eutrophic lakes Occasional algae bloom at the surface Eutrophic Lakes Generally shallow with abundant vegetation Support warm-water fish such as perch bass and pan fish Frequent algae blooms Susceptible to oxygen depletion High phosphorus or chlorophyll readings Eutrophication is a lakes aging process. Sediments erosion and the growth and decomposition of aquatic plants eventually fill up the lake bottom. Over time the lake is converted to a wetland e.g. a bog or marsh and later dry land.This process normally takes tens of thousands of years but human activity can accelerate lake eutrophication by contributing excessive nutrients. 2 UniversityofWisconsinUniversityofWisconsinUniversityofWisconsin