DENDROLOGY

Detailed explanation-1: -The amount of oxygen in a fish tank is a “tolerance zone/limiting factor” that affects the number of fish that can live in the tank. Fish needs oxygen in order to breathe and live. The amount of oxygen limits the fish population since there is enough oxygen only for a limited amount of fish.

Detailed explanation-2: -Oxygen requirements vary between fish species, however, it is recommended your aquarium water has an 80-110% oxygen saturation and DO level of 6-8 mg/L. Supersaturation (anything >115%) in aquariums should be avoided, as it is one of the causes of gas bubble disease in fish.

Detailed explanation-3: -The amount of oxygen that water can hold (saturation) is dependent on water temperature, salinity and atmospheric pressure. As water temperature increases, the amount of oxygen the water can hold decreases. Likewise, as salinity increases, less oxygen can be dissolved into the water.