CATDOLL : CATDOLL: How to prevent and treat the bubble disease of wheatgrass fry?

1. What are the methods for preventing and controlling the bubble disease of wheatgrass fry?

It is multifaceted and needs to be considered comprehensively. The following measures can be taken: 1. Maintain good water quality: The occurrence of bubble disease is closely related to water quality. The water quality should be kept clean and transparent to reduce the accumulation of harmful substances. 2. Add drugs to fish: Certain broad-spectrum drugs, such as sulfonamides and tetracyclines, can be used to treat bubble disease. However, drugs should be used with caution and follow the instructions for use. 3. Enhance the immunity of fish: Bubble disease can be prevented and controlled by enhancing the immunity of fish. The immunity of fish can be enhanced by feeding foods rich in vitamin C, lettuce, water hyacinth, etc. In summary, the prevention and control of bubble disease in wheat dace fry needs to start from multiple aspects and adopt comprehensive measures. By maintaining water quality, coordinating drug treatment and enhancing the immunity of fish, the occurrence and spread of bubble disease can be prevented and controlled.

2. What are the methods to prevent and treat fish white skin disease?

Treatment methods: (1) Thoroughly clean and disinfect the pond; regularly spray 50ml/mu of mold net or 50ml/mu of dithiocyanate methane; (2) Orally take Lifuyukang + high-efficiency immune polysaccharide + high-energy immune VC mixed with bait for feeding, and use it for 5-7 days; 1. Pathogen: White-skinned Pseudomonas aeruginosa 2. Symptoms: When the disease begins, the disease develops at the end of the tail fin and quickly spreads to the back half of the fish's trunk. The spread part appears white, so it is also called white tail disease. In severe cases, the tail fin of the diseased fish rots or is incomplete. Soon, the head of the diseased fish is facing down and the tail is facing up. It struggles and flows in the water and soon dies. 3. Epidemic situation: The epidemic season of this disease is from June to August 4. Prevention methods: (1) Thoroughly clean and disinfect the pond; regularly spray 25ml/mu of mold net or 25ml/mu of dithiocyanate methane. (2) Orally take Lifuyukang + high-efficiency immune polysaccharide + high-energy immune VC mixed bait and feed it for 5-7 days.

3. Cultivation of loach seedlings? How to improve the survival rate in the splash stage?

A few days ago, the TV introduced the breeding of loaches. In the water splash stage, loaches must use the pond mud on the surface of the pond. It is said that there is a small organism called rotifer in this layer of pond mud, which is the bait for loaches in the water splash stage, and can increase the survival rate of loach seedlings to 50%.

4. Which stage of fish is generally used for fish enhancement and release?

Fish enhancement and release generally use released fish species. In order to ensure the survival rate of released fish species, inch flakes and fire flakes are generally used.

5. What are the characteristics of the staged and seasonal growth of fish and their practical significance?

The growth characteristics of fish are:

1. Continuous growth: fish can continue to grow throughout their lives until they age and die;

2. Staged growth: fast growth before sexual maturity and slow growth after sexual maturity. Before sexual maturity, the main manifestation is a significant increase in body length, after sexual maturity, the length growth decreases and the weight growth increases. During the aging period, the growth of body length and weight decreases sharply.

3. Seasonal growth: rapid growth in spring and summer, and gradually slow growth in autumn and winter.

Understanding the above-mentioned growth characteristics of fish can help us determine the fish breeding cycle and choose the period of fastest growth for breeding; determine the fishing specifications of fish; promptly catch and market individuals that have exceeded the rapid growth period to reduce food consumption in the water body; and take effective breeding measures in the spring and summer when fish grow rapidly to accelerate fish growth.

6. Some questions about the growth of biological populations in high school, such as when is the best stage for fishing, when is the best stage for pest control, etc. (a fraction of K or other)?

This depends on whether the biological population you control is beneficial or harmful to humans (humans are the most selfish, haha). In fact, it is relatively simple to understand.

1. If it is beneficial to humans, such as fish, the maximum catch should be obtained during the K value period, but there is a lower limit, and the number of individuals cannot be lower than K/2 (for sustainable development).

2. If it is harmful to humans, such as pests, the best period for prevention and control should be the "rising period" when the population at the arrow point is growing, but the upper limit must be controlled and the number cannot be higher than K/2.