An aquatic ecosystem is an ecosystem that is based in water, whether it is a pond, lake, river, underground water body, estuary or ocean. It comprises living aquatic organisms (eg: fish, plankton, annelids, etc.) which constitute the biotic factors of the ecosystem, as well as their physical environment which collectively can be referred to as the abiotic factor.
Pondsystem is included in Aquatic Ecosystem? Aquatic ecosystems are generally divided into two types
1) inland aquatic, or 'freshwater'; Such ecosystems may be 'lotic' i.e. running water (spring, stream) or 'lentic' i.e. standing water (pond, puddles). Note that many inland aquatic ecosystems are not strictly 'freshwater' as saline ecosystems are common; however the term 'freshwater' has become standard shorthand in conservation biology literature for 'inland aquatic'. Subterranean ecosystems exist in many localities, and are particularly common in karst landscapes. Such ecosystems are at present widely neglected by established systems of protected areas .
2) marine waters, including both shallow coastal waters and the deep waters of the open ocean.
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While insects and similar types of organism strived to inhabit land, the sea was teaming with life aiming to secure their long term survival. Subsequently, reproduction occurred and genetic variation increased. This results in the arrival of fish, who were adapting to live in the largest ecosystem on earth, water.
There are over 20 000 species of fish, all of which have diversified over time to aptly occupy a particular habitat. Since aquatic environments vary greatly in regards to its characteristics, fish diversity also varies greatly.
Temperature
Depending on season, chronological point in time, depth of water and many other factors, temperature will affect how a fish species would occupy or even exist in an ecosystem. An example is some species being better suited to tropical warm waters while others occupy the polar regions of Earth in its present day.
Saltwater / Freshwater
Fish have diversified to occupy saltwater and freshwater in the best way possible. Mostly because salt has on osmoregulation, therefore the fish have underwent tremendous anatomical adaptations to occupy the respective environments
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