CATDOLL : CATDOLL: Where does Rana oil grow?

1. Where does Rana oil grow?

Rana oil is not actually oil, it is the oviduct of the female frog. It is called Rana oil because it looks as smooth as jade and exudes an oily luster. Rana oil will expand after July every year, reach its peak after the frost, and shrink after laying eggs. It is as thin as cotton yarn and cannot be seen without careful observation.

2. Are forest frog eggs afraid of freezing? Can forest frog eggs still hatch tadpoles in spring when the temperature is minus 40 degrees Celsius in winter?

The question you raised does not actually exist. Because in an environment of -40°C and before this low temperature season, the wood frog does not lay eggs at all. The wood frog lays eggs when the severe winter ends and the climate warms up. At that time, even if there is a sudden cold snap in late spring, as long as the water body is not frozen, the frog eggs will still hatch into tadpoles.

3. Will the forest frog die after laying eggs?

If the forest frogs do not have a suitable place to rest after laying eggs, they will die in large numbers. Generally, the frogs are moved to a quiet, moist and sheltered place after laying eggs. 120447200

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4. What are the requirements of forest frogs for spawning ponds?

When the female frog comes out of the water, she is shy and timid, and she is very picky about the place to mate. However, once she enters the spawning pond, she can't wait. As long as she recognizes that this is an ideal place to mate, she will "go to bed" - mate with the male frog. Of course, when the female frog and the male frog mate, they are also very rational, serious, and picky about the environment.

So, what are the requirements of forest frogs for spawning ponds?

The requirements of the forest frog for the spawning pond can be summarized in five words: "shallow, small, quiet, fresh, and medium".

(1) Why should the water layer in the spawning pond be shallow?

Shallow refers to the shallow water layer in the spawning pond.

The water layer of the pond where the wood frog chooses to lay eggs is generally about 30 centimeters. If the water layer is more than 1 meter deep, the wood frog is unwilling to lay eggs there.

Because the depth of water not only directly determines the water temperature, but also determines the level of oxygen, nitrogen, carbon dioxide and other components in the water.

(2) Why should the area of ​​the spawning pond be small?

Small refers to the small area of ​​the spawning pond.

Small spawning pools are easy to raise the water temperature, produce eggs with a high survival rate, grow, develop and metamorphose quickly, and tadpoles grow easily. Therefore, artificial spawning pools should not be too large to save labor, and generally 20 to 30 square meters is appropriate.

(3) Why does the environment of the frog spawning pond need to be quiet?

Quiet refers to the quiet environment of the spawning pond and the quiet water area.

A quiet environment in the spawning pond is an instinctive requirement for forest frogs to reproduce.

No animal wants to be disturbed or harmed when giving birth or when its offspring are weak.

From the perspective of animal psychology, forest frogs are particularly timid during the ovulation and mating period. They are afraid of the noise and instability of the outside world.

Therefore, the spawning pond must be built in a quiet and secluded place.

In addition, wood frogs lay eggs in still water areas, and never in flowing areas of streams or rivers, because they are afraid that their eggs will be washed away by the water.

(4) Why should the water in the spawning pond be fresh?

Fresh means the water quality is fresh.

Fresh water is an important requirement for the spawning pond of the wood frog. Poor water quality will cause the egg mass to rot and also affect the growth and development of tadpoles.

Therefore, when constructing a spawning pond, it is necessary to build an inlet and an outlet to ensure that living water can be replaced at any time.

Another meaning of fresh water is moderate pH. The soil in the northern mountainous areas is mostly acidic. The wood frog is an amphibian that lives in a slightly acidic or neutral water environment. Both its eggs and its children, the tadpoles, like such a neither acidic nor alkaline environment. Frequent water changes can keep the pH moderate.

(5) Why should the temperature of the spawning pond be moderate?

Moderate means that the temperature of the pool water is moderate.

The minimum air temperature for the pairing of forest frogs must be above 5T, and the minimum water temperature must be above 2T. Of course, the most ideal air temperature should be 8~10°C, and the best water temperature should be 7~9°C.

Please note: if the temperature is too low, the forest frog will not pair up, or will extend the pairing time before laying eggs.