A eutrophic lake is a lake with high primary productivity, the result of high nutrient content. These lakes are subject to excessive algal blooms, resulting in poor water quality. The bottom waters of such lakes are commonly deficient in oxygen; thus, such lakes commonly lack those fish species, like trout, which require cold, well-oxygenated waters. This oxygen deficiency is most apparent in shallow lakes, owing to the smaller hypolimnetic volume. Ecologists use the term to distinguish producti… (More on Eutrophic)