Lake ecosystems are unique because they have biotic, or living plants, animals, and micro-organisms as well as abiotic, nonliving, physical and chemical interactions. These biotic and abiotic interactions are an important part of a healthy lake ecosystem and is integral to the daily functions of your lake.
Lake ecosystems are also considered lentic, which refers to relatively still or standing waters. Lentic waters can be anything from a small pond or lake to large wetlands. If the entire body of water is exposed to light at the bottom is is considered a lentic pool or pond, while lentic ponds do not get full light exposure.
The delicate chemistry or your pond or lake is essential to the health of water organisms are this affects oxygen levels. Large fish kills are often the result of some sort of imbalance and should be handled by a professional.