Discussion
Which type of lakes have water with limited transparency (lower than 3 feet) and suffocates fauna below water depths ?
Answer: D
Such lakes are hypereutrophic.
Hypereutrophic lakes are the most nutrient-rich class. Dense, frequent algal blooms cut transparency to less than about 3 feet (under 1 m Secchi depth), and when the algae die and decay they use up the dissolved oxygen in deeper water, suffocating fish and other fauna.
Oligotrophic lakes are nutrient-poor and very clear, mesotrophic lakes are moderate, and eutrophic lakes are nutrient-rich with reduced clarity, but the extreme low transparency and oxygen loss described mark the hypereutrophic stage.
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