CATDOLL : CATDOLL: How many kilograms of crayfish can be produced per acre of land in a year, with breeding methods and environment

answer

1. In the mixed culture mode of shrimp and rice, 1 mu of land can usually produce about 160-200 kilograms per year. Due to the influence of factors such as rice planting and growth, the mixed culture mode of shrimp and rice will cause crayfish to be in an unfavorable growth environment during the high temperature season, resulting in low crayfish production. 2. In the intensive pond culture mode, 1 mu of land can usually produce about 300-400 kilograms per year, and sometimes it can reach more than 500 kilograms. 3. Crayfish farming must maintain a reasonable density to increase production.

1. How many kilograms of crayfish can be produced per acre of land in a year?

1. Under the shrimp-rice mixed culture model, each acre of land can generally produce about 160-200 kilograms per year. Under the shrimp-rice mixed culture model, crayfish will be affected by factors such as rice planting and growth, which makes crayfish in an unfavorable growth environment in the high temperature season, resulting in low yields. Generally, about 60-70 kilograms of shrimp fry are released, and the output under conventional breeding is about 150-200 kilograms. If you want to reach more than 250 kilograms, you need to do a good job of seedling breeding in the autumn and winter seasons every year, so that there are enough shrimp fry in the breeding pond in the second year. At the same time, you need to appropriately release seedlings according to the actual breeding situation.

2. Under the intensive pond farming model, each mu of land can generally produce about 300-400 kilograms per year, and sometimes even more than 500 kilograms. The yield of intensive ponds that mainly breed shrimp fry will be relatively high. Since the intensive pond farming model can adopt a rotational capture and release farming model, more than 2-3 seasons of crayfish can be cultivated in a year, so the yield will be increased accordingly. Using this method requires rich farming experience and refined management, and the farming risk is also relatively high.

3. If you want to increase the production of crayfish, you must maintain a reasonable breeding density. The appropriate breeding density can not only give full play to the main productivity of the pond, but also increase the production, specifications and economic benefits of the shrimp. If you blindly pursue breeding density, it will not only increase the difficulty of breeding, but also cause crayfish to kill each other. Moreover, under high-density breeding, a large amount of residual bait and crayfish excrement will pollute the water quality, resulting in a reduction in the living space of crayfish.

2. Crayfish breeding methods and environment

1. Crayfish breeding method

(1) Breeding sites

1 Although crayfish have a particularly strong adaptability to water quality, the purpose of breeding is mainly to provide food, so the water quality in the breeding pond must be clear and pollution-free and contain rich dissolved oxygen.

2. It is necessary to set up water exchange facilities, oxygenation equipment, etc. in the pond so as to take timely corresponding measures for emergencies.

3. Take anti-escape measures at the entrance and exit of the pond to prevent escape during the breeding process.

(2) Pond cleaning and disinfection

1. The pond must be cleaned and disinfected, which can effectively remove harmful substances, pathogens and parasites, reduce pathogens and reduce incidence rates.

2. Remove the natural enemies of crayfish in the pond, such as snakes and rats. At the same time, prevent the presence of miscellaneous fish in the pond, because miscellaneous fish will compete with crayfish for food and affect the normal growth and development of crayfish. For disinfection, quicklime can be sprayed throughout the pond.

(3) Planting aquatic plants

1 Aquatic plants play an important role in the crayfish breeding process. You can plant an appropriate amount of aquatic plants on the pond stem and bottom. This can effectively increase the dissolved oxygen content in the pond and provide a place for crayfish to rest and provide shade.

2 The area for planting aquatic plants should not be too large, and should not exceed 1/2 of the pond at most. Too much will affect the nutrient absorption of crayfish. You can also place some bottles or bamboo tubes at the bottom of the pond for crayfish to live in.

(4) Fertilizer application

1 Before stocking, an appropriate amount of fertilizer needs to be applied to the shrimp pond, which can cultivate plankton and allow crayfish to prey on plankton freely.

2. Do not apply too much fertilizer, as it will cause disease in crayfish. The specific amount can be determined based on the fertility of the pond water and the area of ​​the pond. The pond water should maintain a certain degree of transparency, which will facilitate later management and observation.

(5) Shrimp fry stocking

1. The time for stocking shrimp fry must avoid the two seasons with extreme temperatures, summer and winter. The specifications of the shrimp fry cannot be uneven, and shrimp fry with good growth and no diseases must be selected.

2 There is no need to stock the fish in batches, all can be put in at once.

3 Before stocking, the shrimp fry needs to be disinfected to eliminate parasites and pathogens on their bodies. The shrimp fry can be soaked in salt water.

(6) Feed selection

1. Lobsters have a very diverse and wide-ranging diet and can be fed with cracked snail meat, river clam meat or animal offal.

2. Do not feed only meat-based food; it needs to be mixed with plant-based feed such as corn and wheat.

3 Crayfish generally forage freely at night and can be fed twice a day. The frequency can be increased appropriately depending on their growth and weather conditions.

2. Crayfish breeding environment

(1) Pond water temperature

1. Crayfish do not have high requirements for water temperature. They can survive as long as the water temperature is around 1-40°C. The water temperature for its growth is above 10°C, the suitable water temperature is around 16-33°C, and the best water temperature is around 20-32°C. However, when the temperature is below 20°C or above 32°C, the growth rate of crayfish will decrease.

2. The crayfish have a certain tolerance to high and low temperatures. In winter, the crayfish will crawl out of the cave to find food, but when the water temperature is below 10°C, they will dive into the cave to hibernate. When the water temperature is above 33°C, the crayfish will move in deep water during the day and forage in shallow water or grass at night.

(2) Dissolved oxygen in pond

Crayfish can adapt to very harsh ecological environments in natural waters, but two prerequisites must be met: there must be abundant natural bait in the water and the dissolved oxygen content in the water must not be too low.

(3) Acidity and alkalinity of water

1 When artificially breeding crayfish in ponds, the pH requirement for the breeding water should be slightly alkaline, which is basically similar to that of fish.

Water with a 2pH of 7-9 is the best environment for crayfish growth and reproduction. When breeding crayfish, it is necessary to adjust the pH of the water. You can use brown sugar or quicklime to adjust it.

(4) Heavy metal ions

1. Crayfish cannot come into contact with heavy metal ions, as heavy metal ions can have serious toxic effects on them.

2 There are two main ways of poisoning: one is that heavy metals combine with proteins in the body to inhibit the activity of enzymes, directly destroying the normal physiological functions of crayfish; the other is that heavy metals combine with gill mucosa to destroy gill tissue, hinder breathing, and cause crayfish to suffocate and die.