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\subsection{Tropical Lake}  The Tropical Lake is a  Hyper-eutrophic ecosystem (Chlorophyll > 19.2 mg/lt) located in a moist Tropical climate (North of the equator, near to the tropic of cancer). This has one wet season and one dry season. Higher irradiance conducts to higher temperatures (Mean) and smaller thermal differences between layers. For that reason,  the water column is permanently warm and stratified. As stratification is due to the heat exchange, but is less stable than at higher latitudes, the wind could have great incidence in the mixing of the water column. Thus, intraseasonal variations have an effect in thickness of the mixed layer than other morphometrically similar temperate lakes  (AES, Lewis). The maximum flow of water is in the wet season, and minimum flow is in the dry season. Episodes of heat, mixing heat  and flow, mixing,  affects the nutrient cycling and plankton dynamics.  It It  is highlighted that primary production in tropical lakes is about twice than higher latitudes. Also, it is known that Nitrogen is the more limiting nutrient.