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The breeding technology of stone frogs
When the spring water temperature rises above 15°C, stone frogs initiate their breeding season. Under standard management practices, adult frogs weighing over 200 grams can spawn two times a year, typically during April to May and July to August. Each spawning event can produce between 1,000 to 2,000 egg capsules. The number of eggs laid depends on factors such as the size of the frog, water temperature, and the development of its gonads. The eggs are sticky and tend to adhere to the sides of stones or pools. After 10 to 15 days, the eggs hatch into tadpoles.
During the breeding period from April to September, mating usually occurs between 9 PM and 3 AM. Breeding pairs should consist of frogs weighing at least 200 grams and be placed in a designated spawning pool. The recommended stocking density is 1 to 2 pairs per square meter, with a female-to-male ratio of 1.5:1. During mating, the male releases sperm while the female lays her eggs. Once the eggs are moved to the hatching pond, it's essential to maintain clean water, with a temperature not exceeding 30°C and moderate density. The ideal water temperature for hatching is between 26°C and 32°C. From fertilization to hatching, the process typically takes 240 to 290 hours. The incubation period is significantly influenced by water temperature—higher temperatures shorten the time, while lower temperatures extend it. The fertilization rate is approximately 88%, and the hatching rate is around 72%.
Newly hatched tadpoles rely on their yolk sac for nutrition for about 4 to 5 days. Once the yolk sac is fully absorbed, they begin to feed. It’s best to feed them manually or in the afternoon. High-protein food sources like egg yolk, soy milk, and fish meal are suitable for their growth. The water in Dianchi Lake must remain fresh and clean. Since the tadpoles are sensitive, poor water quality, foul odors, or excessive bubbles can lead to ear infections and even death. Therefore, maintaining clean and fresh water is crucial for successful breeding and development.