Aquatic animals breathe much faster than terrestrial animals because o

Aquatic animals breathe much faster than terrestrial animals because of :

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low amount of dissolved oxygen in water

low amount of hemoglobin in their blood

high metabolic rate of aquatic animals

large amount of dissolved nitrogen in water

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This question was previously asked in

UPSC CAPF – 2009

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Aquatic animals breathe dissolved oxygen from water using gills or other specialized structures. The concentration of dissolved oxygen in water is significantly lower (only about 5-10 ml per litre, or 5-10 parts per million) and fluctuates more compared to the concentration of oxygen in air (about 210 ml per litre, or 210 parts per million). To extract sufficient oxygen from this lower concentration, aquatic animals need to process a much larger volume of water, resulting in faster breathing rates compared to terrestrial animals which breathe air with a much higher oxygen concentration.

– Dissolved oxygen levels in water are much lower than oxygen levels in the air.
– Aquatic animals breathe faster to compensate for the lower oxygen concentration in their environment.

Temperature and salinity affect the solubility of oxygen in water; higher temperatures and salinity generally lead to lower dissolved oxygen levels. This can further impact the breathing rates of aquatic animals.

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