CATDOLL : CATDOLL: How long does it take for an earthworm to grow to 20 centimeters?

1. How long does it take for an earthworm to grow to 20 cm?

It takes about a year for an earthworm to grow to 20 centimeters in length.

The growth cycle of earthworms:

The average growth cycle is 3 months. Under a good growth environment, it takes about half a year to grow to about 10 cm.

The growth and development cycle of earthworms is closely related to factors such as temperature, density and humidity. They can grow by continuously increasing or enlarging body segments, which usually takes 3-4 months.

2. How many times a year can earthworms reproduce under suitable temperatures?

Generally speaking, the suitable temperature for earthworms is between 5 and 30℃, they enter dormancy at 0-5℃ and die below 0℃. The most suitable temperature is around 20-27℃, at which time earthworms can grow, develop and reproduce better.

Earthworms are terrestrial invertebrates of the phylum Annelida and class Oligochaeta.

Under natural conditions, earthworms can reproduce in warm seasons except in severe winters or droughts. Under artificial breeding conditions, earthworms can reproduce all year round. The growth and development of earthworms from laying egg cocoons to maturing and laying eggs is a reproductive cycle, and the growth and development of earthworms is closely related to environmental conditions.

The optimum growth temperature for red earthworms is around 25°C. Earthworms are hermaphroditic animals, but they must mate with different sexes. Sexually mature earthworms (i.e. earthworms that have fertility rings) will lay eggs one week after mating. However, the frequency of egg laying is closely related to temperature. When the temperature is below 10°C, it will take about 35 days for one egg to be laid; when the temperature is between 18 and 25°C, the humidity is 30% to 50%, and the ventilation is good, one egg will generally be laid every 1.5 to 4.5 days; when the temperature is as high as 10°C, the temperature will be as high as 10°C, and the humidity will be as high as 10% to 25%; when the temperature is as high as 10°C, the temperature ...

At 35℃, the number of eggs laid decreases. The hatching of egg cocoons is also closely related to temperature. When the temperature is below 8℃, the egg cocoons stop hatching; at 15℃, the egg cocoons hatch young earthworms in about 33 days, with a hatching rate of 97%, and an average of 6.8 young earthworms hatched from each egg cocoon; when the average temperature is 20℃, young earthworms hatch in 19 days; at 32℃, young earthworms can hatch in 10 days, but the hatching rate is only 33%, and an average of 2 to 3 young earthworms hatched from each egg cocoon.

3. Why do earthworms always stay in dark and humid places?

1. Moisturize to prevent excessive dehydration

2. There are many substances in the soil that are food for earthworms.

3. Earthworms prefer darkness and don't like sunlight