Why does a betta fish blow bubbles?

📅 👁 4132 views 💬 28 replies Respiratory System
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Expert Answer

A betta blows bubbles mainly because of insufficient oxygen or to prepare for breeding. When oxygen is low, the fish swims to the surface to breathe, and the gas exchange with the water surface produces foam.

Causes of low oxygen include low stocking density and poor water quality; add oxygen promptly if this happens. Also, bettas blow bubbles during mating season as a natural behavior.

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