The profundal zone is a deep zone of an inland body of freestanding water, such as a lake or pond, located below the range of effective light penetration. This is typically below the thermocline, the vertical zone in the water through which temperature drops rapidly. The lack of light in the profundal zone determines the type of biological communi...
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http://en.wikipedia.org/wiki/Profundal_zone
(from the article `lacustrine ecosystem`) ...light penetrating to the bottom and supporting rooted plants and bottom-dwelling animals; (2) limnetic, the water open to effective light ...
Found on
http://www.britannica.com/eb/a-z/p/119
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