The starvation tolerance of guppies varies based on factors like individual health and water quality. Here’s a comprehensive analysis across different scenarios:
1. Regular Starvation Tolerance Periods
Healthy adult guppies: They can typically survive for 10–30 days, but going without food for more than 7 days may lead to weight loss, dull coloration, and weakened immunity. If the tank contains algae or aquatic plants, guppies can extend their survival to over 20 days by nibbling on microorganisms.
Juvenile guppies: Their starvation tolerance is weaker, requiring 2–3 feedings daily. Going without food for more than 3 days may cause stunted growth or death.
2. Extreme Cases and Risks
Experimental records: Isolated cases show that adult guppies can survive 30–45 days in strictly controlled water environments, but this is accompanied by organ damage.
Impact of water quality: If water quality deteriorates (e.g., excessive ammonia levels), guppies may die from poisoning even after only 5–7 days without food.
3. Recommendations for Short-Term Fasting
Within 3–5 days: This has little impact on adult guppies, but it’s necessary to maintain the water temperature at around 26°C and replace 1/3 of the water in advance to reduce metabolic stress.
Over 7 days: It’s advisable to use an automatic feeder or add slow-release food blocks, ensuring the filtration system functions properly.
4. Notes
Fasting management: Stop feeding 24 hours before leaving to avoid leftover food contaminating the water.
Resuming feeding: When restarting feeding, first change the water. The initial feeding amount should be 1/3 of the usual portion, gradually increasing to normal levels.
For long absences, prioritizing asking someone to feed them or using professional equipment to maintain stable water quality is recommended.