CATDOLL : CATDOLL: What are the water temperature requirements for warm water fish? What are the water temperature requirements for warm water fish?

1. What are the water temperature requirements of warm water fish? What are the water temperature requirements of warm water fish?

Warm water fish have very high requirements for water temperature. The temperature of warm water must be between 31 degrees and 33 degrees, not too high, otherwise, fish farming will be dangerous and the mortality rate is very high. Because warm water fish are what we often call tropical fish, they require the water temperature to be guaranteed at around 31 degrees, which is the best water temperature. In addition, warm water can also play a certain bactericidal role, so it is also practical for fish farming.

2. What is the water temperature for sea cucumber seedlings to overwinter?

For larger juvenile sea cucumbers, they should be cultivated in seawater with a water temperature of 8℃~10℃, which is safe, energy-saving and reduces production costs; but for smaller individuals, that is, individuals weighing 7000~10000 heads/kg, they need to be cultivated in seawater with a water temperature above 12℃~13℃. Otherwise, small sea cucumber seedlings will not grow fast and are prone to death or loss.

In conclusion, it is very important to consider both the energy consumption leading to increased production costs and the provision of suitable water temperatures to promote faster growth.

3. Why do fish grow slowly when water temperature is low?

This is because, living in cold water, fish have less activity and slower metabolism, so their growth rate is much slower than warm water and hot water fish, and their growth cycle is generally 1 to 2 years. Cold water fish is a high-quality edible fish with high protein, high unsaturated fatty acids and low cholesterol. 1. The relationship between water temperature and fish body temperature

Water temperature plays an important role in the survival conditions of fish. Fish are cold-blooded animals. The body temperature of most fish differs from the surrounding water temperature by 0.1-1.0℃. Therefore, when fry or adult fish change their environment, temperature stress should be considered.

2. Effect of water temperature on fish gonad development and spawning

The time when mature tilapia and Taiwan loach start spawning is mainly determined by the water temperature. Although the time when spawning starts varies greatly between the north and south, the water temperature is not much different, and generally starts spawning above 23-25℃.

3. Water temperature is related to dissolved oxygen content, which indirectly affects fish

The dissolved oxygen content of the pond decreases as the water temperature rises. For example, under one atmosphere, the dissolved oxygen saturation at 0°C is 14.62 mg/L, and at 20°C it is 9.17 mg/L. However, rising water temperatures increase the metabolism of fish, speed up breathing, and increase oxygen consumption. Coupled with the effects of other oxygen-consuming factors, the pond is prone to hypoxia, which affects the fish. For example, cold-water rainbow trout has a high oxygen consumption rate and requires a higher dissolved oxygen content, and is not adapted to higher water temperatures. One of the reasons is that the dissolved oxygen in higher temperature water is lower.

4. The impact of water temperature on the living environment of fish

Water temperature not only directly affects the survival and growth of fish, but also indirectly affects fish through the change of water environment conditions by water temperature. Almost all environmental factors are restricted by water temperature. Air temperature has seasonal and diurnal changes, and water temperature also has seasonal and diurnal changes. This is a well-known law. Since water is a poor conductor of heat, it transfers heat very slowly from top to bottom. The vertical difference in water temperature between the upper and lower water layers is very obvious, generally reaching 2--5℃. Therefore, the density of the upper and lower water layers is different, and density flow is formed, so that the water body flows up and down by itself, that is, water movement. During high temperature periods, if the weather changes suddenly, such as sultry, thunderstorms, etc., at night, the surface water temperature drops quickly, which will form a strong density flow, driving the decayed matter at the bottom of the pond to float up. A large amount of decomposition consumes the dissolved oxygen in the pond or produces toxins, which will cause fish to float and flood the pond, directly affecting economic income and benefits.

4. Briefly describe the water ecological factors that affect the overwintering survival of fish?

1. Poor physical condition of fish during the winter: Generally speaking, large-sized fish have good physical condition and high survival rate during the winter. Small-sized fish have poor physical condition and less nutrients such as fat accumulated in their bodies. It is difficult for them to maintain energy for survival during the long wintering period and they often die due to physical weakness. However, if the feed formula is unreasonable, the vitamin content is unbalanced or the amount of growth promoter added exceeds the standard, although it does not affect the growth of the species, it will seriously affect the physical condition of the fish and make the fish "fat". The immunity of such fish decreases and it is difficult to survive the winter. Especially in the late winter, they are susceptible to infection by pathogens, fish diseases break out, and wintering losses occur.

2. Hypoxia and low temperature in subglacial water:

(1) Snow is not cleared in time or the clearing area is too small, resulting in poor light transmittance, which affects the photosynthesis and oxygen production of phytoplankton.

(2) The water is thin and lacks fertilizer, the amount of phytoplankton is small, and the oxygen production is insufficient; the zooplankton reproduces in large numbers, and the oxygen carrying capacity increases.

(3) The bottom mud of old ponds is too thick and the high organic matter content causes hypoxia.

(4) Improper water injection or oxygenation. Blindly flushing water or adding oxygen for a long time will cause the water temperature in the pond to drop rapidly, and the turtles will be frozen to death.

3. Harmful substances exist in the wintering pool: Due to the increase in wintering density, harmful gases cannot escape after ice closure, and accumulate more and more in the water. Once the standard is exceeded for a long time, it will cause harm to the wintering fish. The most easily produced chemicals are ammonia nitrogen, nitrite, hydrogen sulfide and carbon dioxide.

4. Fish overwinter with diseases: Pathogens infected during the summer and autumn breeding stage are not treated in time, and the disease accumulates in the winter. The five species have poor physical fitness and poor ability to resist diseases and adverse environments, which increases the chance of infection with fish diseases and leads to fish disease outbreaks.

5. Can Northeast lotus roots survive the winter in water?

cannot.

In East China and North China, lotus roots can overwinter outdoors. However, the winter in Northeast China is too cold, so you can place the lotus pot in a heated room. If the soil in the pot is too dry, just water it a little to keep the soil moist.

In this way, when the weather gets warmer in late spring next year, move it outdoors and gradually add more water, and the water lily will sprout naturally.

If you have already taken it out, you can bury the lotus root nodes in coarse sand and then maintain them in the same way as mentioned above.

As for not blooming, if it is due to insufficient sunlight and insufficient fertilizer, the bowl lotus must be exposed to full sunlight.

6. According to common knowledge about fish, what are the water temperature requirements for channel catfish?

The body length of the Mary fish is generally about 8 cm. It is viviparous and suitable for breeding in water temperatures of 24℃~26℃, with slightly alkaline water quality.

At present, the water temperature should not be lower than the above temperature, which is relatively easy to control. The breeding water temperature is about 26℃.

7. What animal doesn’t look like a fish but is a fish?

The lancelet is known as the least fish-like fish.

Amphioxus, also known as Bai's lancelet, slug fish, double-pointed fish or sea hair, is a precious marine animal. Due to its extremely special morphological structure, it has the characteristics of both invertebrates and vertebrates. It is a typical representative of the transitional type from invertebrates to vertebrates. Therefore, it is highly valued by the biological community at home and abroad.

The appearance of lancelet is very strange and interesting. It has a very small body, flattened on the left and right sides, pointed and thin ends, and a spindle-shaped body. It is generally only 4 to 5 cm long.

8. What type of fish is tilapia?

Tilapia - native to Africa, it is a tropical fish. The genus Tilapia includes more than 100 species, including subspecies. Tilapia has the characteristics of fast growth, high yield, omnivorous diet, few diseases and strong reproductive capacity.

9. Do outdoor plants need to be watered in winter?

When it comes to caring for green plants in winter, the main things are water control and temperature control.

It is the same as controlling water in the dog days of summer. As a green plant lover, I am worried about root burns in summer and root freezes in winter. But we all know that the most important thing in plant maintenance is to take care of the roots first. If the roots are well taken care of, they will grow well naturally.

If the temperature drops suddenly, the water in the soil will freeze easily, and the pot soil will freeze, which will cause great damage to the roots. Therefore, in the winter when the temperature is low, you must control watering. Remember to reduce the number of watering and the amount of water , and keep the pot soil dry so that the green plants can safely spend the winter. The relatively dry pot soil is conducive to improving the cold resistance of flowers and plants, and preventing the roots of flowers and plants from being frostbitten at the same time.

If the plant is obviously lacking water, it is safer to water it on a few days in a month when the temperature is relatively high. Watering is usually done at noon or in the afternoon, and it is best to dry the tap water the day before to keep the water temperature consistent with the soil temperature. This can also remove chlorine and avoid any negative effects on the plant due to watering.

As for temperature control, if you have the conditions, you can buy a thermometer and hygrometer to understand the temperature and humidity in real time. If the temperature is below 5 degrees or drops suddenly, you need to take insulation measures. Otherwise, plants and flowers are easily frostbitten, and the roots are also easily frostbitten, which is not good for growth next year, and there is also the possibility of freezing to death.

Winter is dry and the air humidity is low. After controlling watering in winter, the air humidity can be appropriately increased. The most common method is to use a spray bottle or a humidifier to appropriately supplement the air humidity.

When growing flowers in winter, except for some frost-resistant plants, most potted plants need to take appropriate protective measures when the outdoor temperature is below 10℃.

If conditions permit, you can make a small simple greenhouse to help plants survive the winter; or move them indoors in time before the temperature drops sharply in winter, but keep them away from heating and air conditioning. You can refer to the picture below to make a small simple greenhouse, which I hope will give you some inspiration for free play.

I will share more experience in caring for green plants/flowers/succulents later, and look forward to communicating and making progress with you.

I hope the above can help you. Best wishes.

10. How to overwinter fennel?

The following methods can help fennel survive the winter safely

1. How to overwinter fennel: Harvest fennel with shears and leave stubble. Cover the fennel stubble with hay, leaves or horse manure in winter to protect it overwintering.

2. Fennel likes cool climates and is cold-resistant and heat-resistant. The seeds can germinate at 6°C-8°C, the optimum temperature for germination is 15°C-25°C, and the optimum temperature for growth is 15°C-28°C. Growth will be slightly adversely affected when the temperature exceeds 34°C, but it can tolerate a short-term low temperature of -2°C. It needs sufficient light during its growth and development. It is not strict with soil, but neutral or slightly acidic, well-drained, fertile and loose loam is preferred.