Freshwater fish in rivers and lakes have declined significantly over the past few centuries. According to studies done in Ontario, Canada, rivers contained more species of fish per unit surface area of water than lakes. The number of different species found in rivers was not significantly higher than the number of species found in lakes though.
Most of the lakes found throughout the world are small and lacking in nutrients. They also contain organic material that comes from nearby land. The organic material turns lakes brown, which makes it difficult for sunlight to reach the bottom of lakes. Algae, which is eaten by organisms in a lake, has a harder time growing when there is a lack of sunlight, so lakes in general are not the best environments for fish.
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