Classify lakes on the basis of productivity. 

Lakes can be classified based on their productivity, which refers to the amount of organic matter, or biomass, produced in the lake. The productivity of a lake is determined by the amount of nutrients, primarily nitrogen and phosphorus, available in the water. Based on their productivity, lakes can be classified into three categories: oligotrophic, mesotrophic, and eutrophic.

1. Oligotrophic Lakes
Oligotrophic lakes are low-nutrient, low-productivity lakes. These lakes are characterized by clear water, low nutrient levels, and low algae production. Oligotrophic lakes are often deep, cold, and have a low concentration of organic matter. Due to their low nutrient levels, the aquatic plants and algae in these lakes have limited growth, and the food chain is relatively simple. Fish populations in oligotrophic lakes tend to be dominated by cold-water species, such as trout or salmon.

2. Mesotrophic Lakes
Mesotrophic lakes are moderate-nutrient, moderate-productivity ______ ____ __________ _________ _____ ______ ____.
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