CATDOLL : CATDOLL: When does the wood frog start laying eggs?

When do wood frogs start laying eggs?

The forest frog lays eggs in early spring (starting after Qingming Festival), and the eggs can develop normally at low temperatures (above 6°C).

At present, most frog farmers use outdoor hatching ponds, with 2 to 3 egg masses per square meter of water surface for direct hatching, and the hatching rate is generally 40% to 60%. The hatching rate is not only related to the construction standards of the hatching pond, artificial hatching technology and management level, but also restricted by natural conditions in the wild. For example, the wind will cause the eggs to gather together, resulting in late development of the lower eggs and uneven embryo development; the low temperature will slow down the embryonic development, and the embryos on the surface of the egg mass will be frozen to death if they encounter frost damage; it is inconvenient to manage and is often attacked by natural enemies.

In order to improve the hatching rate of artificially raised frogs, the basic conditions for hatching frog eggs should be met according to the basic conditions for hatching frog eggs. A small bow shed should be used to hatch frog eggs. Artificially improving the objective conditions for hatching frog eggs can improve and ensure the hatching rate of frog eggs.

Note:

(1) The minimum temperature for Rana sylvatica to lay eggs is 2°C, and the most suitable temperature is 10°C.

(2) Like fish, wood frogs are animals that undergo external fertilization. The wood frogs mate by "embracing each other", that is, the male frog lies on the back of the female frog, and uses his forelimbs to tightly embrace the female frog's chest and abdomen from under her ribs. As the female frog lays eggs, the male frog begins to ejaculate. Then the frog sperm and frog eggs begin to combine in vitro. The tighter the male frog embraces, the more excited the female frog becomes, and the faster she ovulates.

(3) The female frog's ovulation time starts at midnight every day. The peak of egg-laying is at 5 a.m. The male and female frogs can "hold their foetus" for 4 to 6 hours.

(4) The ratio of male frogs to female frogs is 1:1. However, practice has shown that if you want to make the forest frogs ovulate quickly, you can release 20% more male frogs. This will cause competition and stimulate the speed of ovulation.