10 - 30 Days
Betta fish can usually survive for 10 days to a month without being fed. The specific survival time depends on factors such as the water quality and the presence of natural food in the environment.
Key Influencing Factors
Water Quality and Ecological Environment
In an environment with clear water and aquatic plants, betta fish can survive for about a month by feeding on microorganisms or plankton.
If they are kept together with other fish species, betta fish may prey on small fish, which can extend their survival time.
Water Temperature and Metabolic Rate
When the water temperature is relatively low (such as between 15-20℃), the metabolism slows down, and the energy consumption decreases, allowing them to survive for a longer time. In a high-temperature environment (such as above 30℃), the energy consumption will be accelerated, shortening the survival period.
Individual Differences
Adult betta fish have more fat reserves, so they are more resistant to hunger than juvenile betta fish. Also, individuals with good physical health can survive for a longer time.
Potential Risks
Even if they don't starve to death, long-term hunger can lead to growth stagnation, a decline in immunity, or organ failure.
If the water quality deteriorates (such as excessive ammonia and nitrogen levels), it may accelerate their death.
It is recommended to feed betta fish regularly and maintain stable water quality to preserve their ornamental value and healthy condition.