What are the 4 growth sequences of tadpoles?

Tadpoles come out in spring, because tadpoles are breeding from March to August, and April to June is the peak breeding season; And when the tadpoles mature, they begin to degenerate, gradually grow limbs, and then gradually degenerate their tails through apoptosis.

Tadpoles are a primary stage of amphibian ontogeny, and the newly hatched tadpoles have a spindle-shaped body, no limbs, mouth and inner gills, a long tail with flat sides, and branched outer gills on both sides of the head, which are adsorbed on aquatic plants and rely on the remaining yolk in the body to provide nutrition.

Living Environment:

Small tadpoles live in relatively still waters. Newly hatched tadpoles are weak and sensitive to the outside environment. It is suitable for growing in thin water, fresh and pollution-free, with a water temperature of 20 29 and a pH value of 6 8.

Tadpoles avoid light and grow in dimly lit, secluded places. Therefore, frogs generally choose ponds, small ditches, forked waters of small rivers, and inlets of large lakes to lay eggs, rather than laying eggs on the banks of rivers that flow obviously. In addition, frogs will only lay eggs near the shallow waters, and in these still or relatively still waters, it is easy to gather plankton, algae, aquatic plants, etc., and the shallows near the water are wet, which also provides the probability of small insect activity, so that tadpoles do not have to worry about the initial food during the water life stage and after landing.

Frogs usually lay their eggs in the water, and after a few days the eggs turn into small tadpoles with short legs that seem to be wrapped in a membrane. After about four days, the tadpole's legs will grow and it will be ready to start wading. After another three days, the tadpole's belly became whiter and bulging, and all the first two legs had grown.

Frogs are a more beneficial animal and are able to eat pests. Frogs are also an ecological measure, and they are easy to see in rural areas where pollution is very light, but it is difficult to see frogs in ponds where pollution is very heavy.

Tadpole precautions.

Tadpoles can be fed with some aquatic plants in the water to prevent the water from being hypoxic. Tadpoles need to be given a water change every 3-7 days, each time 2 3. The bait of small tadpoles can choose cooked egg yolk shirt and goldfish feed, and feed them once a day.

When raising tadpoles with tap water, take care to dechlorinate the water first.

Small tadpoles can be raised in a glass container, placed in a sunny place, and put some aquatic plants in it, which is not only for good looks, but also to absorb the carbon dioxide that the tadpoles in the water know from the collapse, and then release oxygen.

In the process of growing up, the tadpole will go through 5 processes: growing two hind legs, shortening the tail, growing two front legs, disappearing, and becoming a frog.

Early growth: tadpoles do not forage for food within 3 days of hatching, relying on nutrients brought from the yolk to maintain life, and feeding too early can easily lead to their death. Pre-growth:

After 10 days of hatching, the tadpoles eat more, their growth and development accelerate, and they begin to look for new food. Middle Growth: This is when the tadpole's digestive function is increasing.

Late growth: This is the critical period for tadpoles to transform into young frogs, where they develop hind and forelimbs.

1. The primary stage of tadpoles, early small tadpoles, with a round or oval body, resembling a fish, and a long and flat tail.

2. Grow a small hind foot, the end of the differentiation of 5 toes, the general shape has not changed, the eyes can be more flexible, and the overall shape is slightly increased. Since there is no orifice in the mouth, food cannot be ingested.

Later, the eyes and nostrils appear one after the other; There are suction cups under the head, which can be used to attach to aquatic plants. The sides of the head have external gills and have respiratory functions. There are segmented tail muscles, and the upper and lower parts of the sarcomere have membranous upper and lower tail fins that help tadpoles swim in water.

3. The hind feet are gradually elongated, with the basic shape of the frog's hind limbs, and the tail becomes more slender.

4. One forelimb grows out, differentiating into 5 toes, the mouth is slightly protruding, and the head and body can be distinguished gradually, and the tail is thinner, but the overall shape is increased.

5. Finally, all the limbs are developed, the eyes are prominent, the mouth is enlarged, and the tail can be brought or not, then it can be called a frog.

The four growth sequences of tadpoles are egg-tadpole-young frog-adult frog.

1. Eggs

Small tadpoles are oviparous animals. Therefore, the tadpole is born in the form of an egg, just like a small black bean. After a period of time, the tadpoles will slowly hatch, grow a small tail, and swim happily in the pond.

2. Tadpoles

Tadpoles are the second stage of tadpole development. At this stage, the tadpoles will slowly grow up. Slowly, the tail of the tadpole disappears, and when it disappears, the tadpole slowly grows feet.

After the tail disappears completely, the tadpole's legs are better developed, and the tadpole becomes a young frog.

3. Young frogs

The young frog is the third stage of the tadpole and the little frog we know as well. The process of transforming from tadpoles to young frogs is relatively slow, as tadpoles go through tail degradation and leg development. When the young frog grows up, it becomes the fourth stage of the tadpole.

4. Adult frogs

The adult frog is an enlarged version of the young frog and the fourth stage of tadpole growth. In the process of growing from a young frog to an adult frog, you must learn to hunt in nature. The frog's diet is some pests and a small number of plants, which belong to a type of beneficial insect.

Construction of tadpole breeding ponds

In order to ensure economic benefits, the intensive breeding mode is generally adopted, so the standardization should be ensured when building the pond to provide a good environment for the growth and development of tadpoles. The frog pond is designed as a rectangle of 1m 2m, and the inner wall is coated with impermeable paint to improve the smoothness of the inner wall of the pool, so as to avoid damage to tadpoles caused by the cement pool wall, and also to avoid the climbing and escape of young frogs.

There is a certain slope at the bottom of the pool, and the water depth of 3-10cm is ensured under the condition of a water-land ratio of 2 to 1. And at the bottom of the device 2-4 heating rods to ensure that tadpoles can develop normally in winter and reduce the winter development time. There is an opening at the bottom of the pool, which is connected to the plastic pipe outside the pool to adjust the water level.

A net cover is added to the top of the breeding pond to prevent the invasion of predators.

In winter, because their frogs are laying eggs, in spring they have turned into tadpoles.