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 role do fish scales play for fish?

1. Fish scales have the function of protecting the fish body and making the fish grow healthily;

2. Fish scales can reduce the collision between fish and external objects, thereby reducing friction;

3. Fish scales can fully preserve the water of fish and will not cause water loss.

First of all, fish scales are the second life of fish. Without the protection of fish scales, the life span of fish may be greatly reduced, and they may even die at birth. Fish are also more prone to skin diseases. Relatively speaking, fish scales indirectly prevent the growth of skin diseases and can also reduce the impact when attacked by other species.

Secondly, fish scales can greatly reduce the friction on the fish body. Fish must live in water, and friction is inevitable when in contact with water all year round. If they encounter mud and sand, the friction coefficient will be very large. Fish scales can greatly reduce the harm caused by friction to fish.

Finally, for freshwater fish, there is an osmotic pressure balance. Long-term contact with water makes the fish scales act like a thin film that isolates the water, thus creating a dynamic balance effect, so that the fish's body will greatly reduce contact with water.

3. What is the effect of gonadotropin on cattle?

Hello HCG features:

1. It has the functions of FSH and LH, maintaining the life of the menstrual corpus luteum and making it enlarge into the corpus luteum of pregnancy;

2. Promote the aromatization of androgens into estrogens and stimulate the formation of progesterone;

3. Inhibit the stimulation of plant lectins on lymphocytes. HCG can be adsorbed on the surface of trophoblast cells to prevent embryonic trophoblast cells from being attacked by maternal lymphocytes.

4. Stimulate the fetal testicles to secrete testosterone and promote male sexual differentiation;

5. It can bind to the TSH receptor of maternal thyroid cells and stimulate thyroid activity.

4. What is the role of purslane in fish farming?

In fish farming, purslane is not only a good feed for fish, but also a good Chinese medicine for preventing fish diseases, such as skin rot and eye rot of turtles and enteritis of fish. Usage: To prevent enteritis and skin rot of turtles, turtles and fish, take fresh orally, 50% purslane, 30% dandelion and 20% herba euphorbiae are blended into a slurry at a ratio of 10% of the daily dry feed, remove the residue and take the juice and add it to the feed to make granules, feed for 7 to 10 days every month.

If fine dry powder is used, mix it into the feed at a ratio of 1.5% of the daily dry feed and feed it for 8 consecutive days per month. However, the fine powder must be soaked in warm water for 2 hours before mixing.

5.What effect does vitamin C fat have on fish?

Regulate the growth of fish, promote development and maintain their own stability. Fat is beneficial to health and is generally added to the feed at a rate of one kilogram per ton.

6. What role do fish play in the marine ecosystem?

Compared with other groups, fish have a unique position in aquatic ecosystems. Generally speaking, fish are the climax community in aquatic ecosystems and are the target of fishing in most cases. There are many different groups of fish, and the relationships between them are complex. Under the influence of environmental factors, fish will produce various adaptive changes. At the same time, as the climax community, fish play an important role in the existence and abundance of other groups.

Fishery biology is a part of aquatic biology. It mainly studies the biological characteristics of fish populations and their relationship with the environment, and then explains the economy and rationality of fisheries. Reasonable fishery development lies in ensuring good water environment conditions and obtaining the maximum output of continuously high-quality fishery products from the waters. On the basis of understanding fish feeding habits, reproduction, growth, intraspecific and interspecific relationships, further studying the laws of changes in fish populations and their relationship with human activities and the environment is the theoretical basis for ensuring reasonable fishery production.

7. What are the effects of light, water and temperature on agriculture?

Climate provides energy and materials such as light, heat, and water for agricultural development. The climate factors in a certain place often determine the agricultural characteristics and development goals of that place.

(1) Temperature is the main factor affecting the growth and development of crops. Accumulated temperature determines the maturity of crops and the differences between crops. For example, in southern my country, there are three crops per year, while in northern China, there is only one crop per year. For example, spring wheat in Northeast my country and winter wheat in North China.

(2) The daily temperature difference and light have an important impact on the yield and quality of crops. High temperature and strong sunlight during the day are conducive to the photosynthesis of crops and can produce more nutrients; low temperature at night weakens the respiration of crops, reduces energy consumption, and is conducive to the accumulation of nutrients (sugar).

(3) Water conditions affect the growth of crops and form different agricultural sectors. For example, areas with more precipitation form the planting industry, while areas with less precipitation form the animal husbandry industry.

(4) The impact of the combination of light, heat and water on agricultural production. For example, the combination of water and heat in southern my country is better, the water conditions in northeastern my country are better, but the heat is insufficient; the sunlight in northwest my country is sufficient but the water is insufficient. Therefore, the combination of climate factors must be considered.

8. What are the effects of using florfenicol on fish?

Origin of Florfenicol "Chloramphenicol" is an antibiotic that everyone is familiar with, but chloramphenicol has very serious side effects after use (it can inhibit bone marrow and cause aplastic anemia in animals). Therefore, starting in 2002, all animals that can be eaten by humans were banned from using chloramphenicol, including pigs, chickens, ducks, fish, etc. Since then, based on chloramphenicol, a chloramphenicol derivative "thiamphenicol" was produced after its improvement. Compared with chloramphenicol, thiamphenicol has enhanced bactericidal ability and reduced side effects, but there is still a small probability of symptoms such as "bone marrow suppression" and "anemia". Therefore, thiamphenicol is still a little lacking in perfection, so its use in animals is subject to certain restrictions. In the late 1980s, after further improvements to thiamphenicol, a new derivative was finally obtained, which further enhanced its bactericidal ability and completely eliminated the side effect of "anemia". This is Florfenicol. (Figure 1.1)

2. The development history of florfenicol Just as the new veterinary drug "Meiting" has an alternative effect on the banned drug malachite green, the emergence of florfenicol also caused a sensation in the entire scientific community. Since florfenicol was first used in Japan to treat marine fish in 1990, after nearly 30 years of verification in Europe, the United States, China, etc., florfenicol is still a safe and efficient bactericidal drug. In 2013, China's Haibei Biological successfully launched Haifukang, a special florfenicol for aquaculture, after scientific formulation.

3. The current status of florfenicol application in my country In many areas, florfenicol has a high price and low frequency of use, so there are many misunderstandings about it. Many people believe that florfenicol has strong bactericidal power and great side effects, and improper use will cause fish to die more severely, so they will not choose florfenicol unless it is absolutely necessary.

9. Does the injection of human chorionic gonadotropin have any side effects on humans?

Whether the injection of chorionic gonadotropin has side effects on people depends on the physical condition and the injection dose. A moderate injection will not have any adverse effects on health. It should be noted that patients with heart disease or heart failure cannot use it. It can be considered for mild bloating and stomach pain caused by ovarian cysts or mild to moderate ovarian enlargement.

10. What effects do sulfur, chlorine, argon, potassium and calcium have on fish?

1. Maintaining normal needs: It is very normal for aquatic animals to maintain their normal needs. When we humans are deficient in potassium, it is very serious. We may not be able to walk and our legs may tremble. When aquatic animals lack potassium, a large number of them will die. When the deficiency is relatively small, their molting rate will be greatly reduced, which will of course affect their survival rate.

2. Maintain osmotic pressure: This is basically very normal and is mainly maintained by table salt and potassium chloride, because they need to adjust the urea in the blood to make their osmotic pressure almost the same as that of the outside world. If the concentration of the outside world is relatively low, the water from the outside world will continue to enter the high-concentration water.

3. Prevention and control of emergency: There are no real drugs for emergency treatment, but there are some drugs for prevention and control of stress. We often use some electrolyte substances, sodium bicarbonate, potassium chloride, ammonium chloride, etc. These are some of the better drugs for prevention and control of stress.

4. Control water quality: Generally speaking, we want it to have the effect of fertilizing water, because in this way there will not be a lot of moss. The main fertilizers we use are phosphorus fertilizer, nitrogen fertilizer, and potassium fertilizer. The most commonly used one is potassium sulfate, and its content is generally around 48%.