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A freshwater aquarium with plants and various tropical fish The underwater tunnel in the London aquarium. An aquarium (pl.: aquariums or aquaria) is a vivarium of any size having at least one transparent side in which aquatic plants or animals are kept and displayed.
To support a quick initial growth, the water level is relatively low [34] and increases when plants grow. Then a maximum of approximately 4,000 per hectare (1,600/acre) with grid spacing of 1.2 by 2 metres (3 ft 11 in × 6 ft 7 in) [35] are used to plant directly into the mud10–15 cm (3 + 7 ⁄ 8 – 5 + 7 ⁄ 8 in) below the soil surface. [36]
A system with low concentration—in the range between 1 and 30% saturation—is called hypoxic or dysoxic. Most fish cannot live below 30% saturation since they rely on oxygen to derive energy from their nutrients. Hypoxia leads to impaired reproduction of remaining fish via endocrine disruption. [6]
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