The lifespan of male betta fish is affected by rearing conditions, breed, and gender differences. Details are as follows:

1. Lifespan Range
General Condition: Male betta fish typically live for 3 to 5 years, which is longer than that of females (2 to 3 years).
Ideal Condition: If provided with a stable rearing environment (e.g., suitable water quality and temperature), some individuals can live up to 5 to 6 years, and in rare cases, some even reach 9 years.
2. Key Influencing Factors
Water Quality: Maintain a pH level of 6.5 to 7.2, and change water regularly to prevent ammonia accumulation.
Temperature: Keep a constant temperature of 24 to 28°C (it can be slightly higher during the breeding period), and avoid temperatures below 20°C.
Diet: Feed them high-protein food (such as bloodworms and daphnia) combined with pellet feed, and avoid overfeeding.
Space: Keep them individually to reduce stress from fights and provide sufficient space for activities.
3. Tips for Extending Lifespan
Fish Selection: Choose healthy individuals that are about 1 year old with well-developed fins and tails.
Disease Prevention: Check the fish regularly and treat common diseases such as fin rot and water mold in a timely manner.
Stable Environment: Avoid drastic fluctuations in water temperature and quality to reduce stress on the fish.
With proper care, male betta fish can be long-lived ornamental fish. However, it is important to note that they are highly sensitive to environmental changes.