CATDOLL : CATDOLL: In which season do fish grow fastest?

1. In which season do fish grow fastest?

Summer and autumn.

The peak season for fish growth is generally from June to September each year. During this period, the water temperature is suitable, bait and fertilizer are sufficient, and fish eat vigorously. It is the golden season for fish growth. However, it should also be noted that due to the high temperature, fish are prone to disease.

However, due to the large latitude span between the north and south of my country, the corresponding temperature and seasonal changes are quite different, and the growing season lengths vary. For example, compared with the Yangtze River Basin, the north is generally delayed or advanced by about one month.

2. How do seasonal changes affect the growth, development and reproduction of earthworms?

Introduction to the technical details of the whole process of earthworm farming

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

In order to obtain high yields when breeding earthworms, it is necessary to study and be familiar with the living habits of the earthworms and the required ecological conditions, and understand their impact on the earthworms.

1. Temperature

Earthworms are cold-blooded animals, and their body temperature changes with the temperature of the external environment. Therefore, earthworms are generally more dependent on the environment than warm-blooded animals. The environmental temperature not only affects the body temperature and activities of earthworms, but also affects the metabolism, growth, development and reproduction of earthworms. In addition, the temperature also has a great impact on other living conditions, thereby indirectly affecting earthworms. Therefore, temperature is one of the most important living conditions for earthworms.

Generally speaking, the activity temperature of earthworms is within the range of 5-30℃, they enter a dormant state at 0-5℃, and die below 0℃. The most suitable temperature is about 20-27℃, at which they can grow, develop and reproduce well. At 28-30℃, they can maintain a certain growth; above 32℃, growth stops; below 10℃, the activity is sluggish; above 40℃, they die, and the optimum temperature for earthworm cocoon hatching is 18-27℃. It can be seen that the highest lethal temperature of earthworms is lower than that of other invertebrates. It is best to have a breeding farm indoors in the southern region. In summer, ventilation and moisture retention are provided, and in winter, just closing windows to keep warm can produce normally throughout the year (the temperature here refers to the temperature of the base material, because the temperature of the air is different from the temperature of the base material, for example: when the air temperature is 0℃, the base material temperature is about 12℃; when the air temperature is 38℃, the base material temperature is only about 28℃, because the manure contains extremely high moisture).

2. Humidity

Earthworms do not have special respiratory organs, they breathe through their skin, so the body of earthworms must be kept moist. If earthworms are placed in a dry environment, their skin will not be able to stay moist after a period of time, and thus they cannot breathe normally. The earthworms will immediately go into spasms and die soon. The water content in earthworms is very high, accounting for more than 75% of their body weight, so preventing water loss is the key to their survival. Of course, too wet soil is also not good for the growth and development of earthworms.

Earthworms also have the ability to temporarily tolerate unfavorable humidity conditions. In order to survive, they sometimes move to a suitable environment through exercise, and sometimes reduce water consumption through hibernation, diapause, and reduced metabolic intensity.

Since earthworms like to eat fine, rotten, and wet feed, and especially breathe by absorbing oxygen dissolved in water through their skin, it is particularly important for earthworms to maintain a certain water supply. Earthworms have a poor ability to resist sudden dryness, and the optimal humidity for their breeding environment is 70-75%.

3. pH value

Earthworms are very sensitive to acid and alkali, because the chemical receptors that can sense acid and alkali are scattered on the surface of earthworms. Earthworms cannot survive in strong acid and strong alkali environments, but they have a certain adaptability to weak acid and strong alkali environmental conditions. Daping No. 2 earthworms grow best in the pH range of 6-8, and produce the most cocoons in the pH range of 7-7.5.

4. Salinity

Some people have conducted experiments on earthworms' tolerance to salinity. They placed William's ringworms in 0.02%, 0.1%, 0.4%, 0.8%, and 1.6% salt solutions, and in 0.01%, 0.02%, 0.04%, and 0.08% copper sulfate solutions, and observed the time of death of the earthworms. The earthworms in the solutions with salinity of 0.8% and 1.6% died in 145 minutes and 52 minutes, respectively. The earthworms in the other salt solutions did not die for 24 hours, which showed that they had a certain tolerance. All the earthworms in the four copper sulfate salinity solutions died, and the death times were 50 minutes, 76 minutes, 75 minutes, and 57 minutes, respectively. This shows that copper sulfate solution has a strong toxic effect on earthworms. Therefore, in the cultivation of earthworms, attention should be paid to the impact of salinity on earthworms, especially to prevent the poisoning of earthworms by harmful pollution such as certain pesticides and fertilizers.

5. Ventilation

Earthworms breathe by relying on oxygen diffused from the atmosphere into the soil. The better the soil is ventilated, the more vigorous their metabolism. Not only do they lay more egg cocoons, but their maturation period is also shortened. Earthworms cannot live in environments with high levels of carbon dioxide, methane, fluorine, and hydrogen sulfide. If there is excessive hydrogen sulfide and methane in the habitat, earthworms will flee or even die in large numbers. For example, in some places in the north, in order to keep warm, stoves are burned in earthworm farms and breeding rooms. Due to smoke leaks from pipes, a large number of earthworms die. This is because the smoke contains harmful gases such as sulfur dioxide, sulfur trioxide, and carbon monoxide. During the fermentation of feed, harmful gases such as carbon dioxide, ammonia, hydrogen sulfide, and methane are produced. When the content of these gases reaches a certain level, they will poison earthworms. Experiments have shown that when ammonia exceeds 20 parts per million, it will cause increased secretion of earthworm mucus and cluster death; when hydrogen sulfide exceeds 15 parts per million, earthworms will develop neurological diseases and die. When methane exceeds 15 parts per million, it will cause blood overflow in earthworms and cause death. Therefore, the feed should be fully fermented before feeding. It is best to stir the fermented feed and let it sit for a period of time before feeding.

6. Lighting

Although earthworms have no eyes, they have sensory cells all over their bodies, which are more distributed in the preoral lobe and the first few segments, but none on the ventral side. They are very sensitive to light and can distinguish strong light from weak light. Their sensitivity ranges from purple to green, and they are most sensitive to blue light. Earthworms die after being exposed to sunlight through a blue filter for 3 hours. They die after being exposed to sunlight through an orange filter for two or three days. Earthworms are afraid of direct sunlight and die after ten minutes under strong light.

Blue light is irritating to earthworms, but red light is not, and ultraviolet light is harmful. Therefore, the breeding site should avoid direct sunlight, and it is best to raise them indoors and light a red fluorescent lamp.

7. Density

Density refers to the number of earthworms per unit area or volume. The size of the breeding density will greatly affect the changes in the environment, and thus have a great impact on the overall earthworm production and cost. When the density is low, although the competition for individual survival is not fierce and each earthworm multiplies a lot, the overall area of ​​earthworm multiplication is high.

3. How does dust affect weather changes?

Dust can affect changes in the atmospheric environment, but its impact on climate change is more complex and needs to be analyzed under the interaction of multiple factors.

On the one hand, a large amount of dust will affect the sun's rays, reduce the heat absorption of the earth's surface, and thus lead to cooling. According to some existing research results and measured data, certain specific dust and particles will absorb and scatter solar radiation, thereby affecting the radiation balance of the earth's climate system and having a certain impact on the global climate pattern, cloud cover, precipitation, wind, ocean circulation, etc.

On the other hand, dust can also affect the heat exchange process and chemical reactions between the surface, atmosphere and ocean, affecting the global energy balance and climate change. For example, some studies have shown that the network of dust storm activities may cause changes in the content of reactive gases in the tropical atmosphere, thereby affecting the intensity and direction of climate change. At the same time, because dust absorbs a large amount of chemical substances, it may change the redox reaction in the air and the aerosol composition in the atmosphere, thus affecting the atmospheric chemistry and biological cycle.

In general, the impact of dust on climate change is complex and diverse, and requires research and analysis based on a comprehensive range of factors and data, and the proposal of reasonable response strategies to reduce the impact of human activities on the environment.

4. What factors affect seasonal changes in water levels?

The factors that affect the seasonal changes in water levels are the rainy season and the dry season because some seasons are dry seasons and some seasons are rainy seasons.

5. What is the impact of seasonal changes on plants?

The four seasons affect the morphology of plants, such as the yellowing of leaves in autumn, but the differences in temperature and light intensity brought about by the four seasons can also have an impact on plants like day and night.

For temperate regions, most green plants begin to sprout, grow leaves and start growing in spring (some also bloom). Summer is the vigorous growth period. In autumn, the fruits and seeds mature and are collected or scattered on their own. In winter, the plants shed their leaves and become dormant (perennial plants) or the plants wither and the seeds become dormant (annual herbs).

6. Which animals change with the seasons?

Migratory birds and cold-blooded animals change with the seasons. For example, wild geese, swallows, and ducks migrate to the south for the winter in the fall and fly back to the north in the spring.

Animals like frogs and turtles hibernate in the fall and wake up in the spring of the following year.

7. Does salinity change with the seasons?

The isohalin lines of the ocean do not have obvious seasonal changes. The isohalin lines of the seawater at the river estuaries do have seasonal changes. When the river basin enters the rainy season, the river runoff is large, and more fresh water is injected into the ocean. The isohalin lines at the river estuaries bulge away from the coast; when the river basin enters the dry season, the river runoff is small, and less fresh water is injected into the ocean. The isohalin lines at the river estuaries bulge toward the coast.

8. How will nylon material change due to the influence of temperature?

Because nylon has high water absorption, it is dried during injection molding, and the product has large internal stress, so it generally needs to undergo heat treatment or humidity conditioning. After humidity conditioning, nylon reaches equilibrium moisture absorption, so the problem of easy breakage will be improved.

9. Will cracks in Buddha Belly Bamboo affect its growth?

The cracks in the Buddha belly bamboo will affect

The cracking of Buddha belly bamboo is caused by overwatering. Buddha belly bamboo likes warmth and humidity and is not cold-resistant. It grows best in fertile, loose, moist, well-drained sandy loam. It is distributed both at home and abroad. This species is often used as a potted plant, and artificial top cutting is used to form deformed plants for viewing; when planted on the ground, it forms a tall bamboo clump, and occasionally a few deformed poles grow among normal poles.

10. Why do seasonal changes in runoff affect shipping?

Answer: Why do seasonal changes in runoff affect shipping?

Runoff is atmospheric precipitation. After falling to the ground, except for a small part that evaporates, the rest is collected through the surface or underground to the catchment area. This kind of catchment is called runoff. Among them, the water that flows along the surface into the river is called surface runoff, and the water that seeps down to become groundwater is called underground runoff. It has large seasonal changes and is not conducive to navigation.