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All ecosystems are important to all life, regardless of how big the particular ecosystem is. Freshwater aquatic ecosystems account for a minority of global aquatic ecosystems, with most being saltwater, but their health is critical to the planet and to human life. Ecosystems depend on all parts to work the way they are supposed to. If one part of the ecosystem goes away, whether it be through death or through emigration, then the whole ecosystem can suffer as a result. For example, the amount of plants available changes the amounts of nutrients available, and the number of predators available changes the amounts of prey and therefore plants available.
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Ultimately, fish behavior is a product of bioenergetics. First, we will take a look at basic fish bioenergetics, understanding the underlying quantitative principles. Then, we will look at some examples of how physical forces, thermodynamics, and light characteristics are specifically related to fish bioenergetics. Most of these models and ideas are made under the assumption that there is no predation or competition, which are additional factors that will influence behavior. Fish bioenergetics includes components of physical forces, thermodynamics, and light characteristics, and follows energy laws and theories describing any other closed system.
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