CATDOLL : CATDOLL: What medicine can be used to bring carp out of the river?

1. What medicine can be used to bring carp out of the river?

What medicine is good for poisoning fish? In layman's terms, it is called "fish disturbance", which is to use medicine to poison and kill the creatures in the river. What medicine is good? As long as the medicine is not harmful to humans, it doesn't matter if it cannot be eaten. It is best to poison and kill all the creatures in the river at once. In recent years, the small river in front of my house has been disturbed dozens of times a year, and no one cares. Although the fish are getting fewer and fewer, almost gone, after all, some fish always run out of the fish pond after the flood. Every time the fish are disturbed, there are children who go to catch fish. I think this is very dangerous. Today, another child was choked by water. No one stopped this from destroying the ecology. I think it would be better to completely destroy the river ecology. At least children will not go to the river to catch fish again. That is really dangerous. So I hope someone can recommend a better medicine.

It is best to use 4% rotenone, which is safe! Capturing ornamental fish: Various fish will quickly float to the surface in a solution with a lethal concentration of rotenone (0.025mg/L). If they are transferred to a methylene salt solution with a concentration of 5-10mg/L in time, these fish will immediately regain their vitality. By using this characteristic of rotenone, high-quality ornamental fish can be captured. This method is mainly used in some scientific research and academic research. Rotenone is extremely toxic to fish. 0.0025mg/L can cause fish to become comatose and die, while shrimps can easily survive at 10mg/L. Therefore, people have the habit of using it for fishing and clearing ponds for shrimp farming and catching ornamental fish.

2. Poison for fish and shrimp. What if someone drinks pond water by mistake? Will they be poisoned?

It is definitely not allowed. It is best to go to the hospital for a check-up, induce vomiting or have your stomach washed, because some poisons are chronic and may damage your internal organs if used for too long.

3. How to raise variegated clams in shrimp ponds?

(1) Shrimp pond selection and cleaning

① Water quality and water source. Clams filter plankton (diatoms) in the water, which requires no sewage injection near the shrimp pond, seawater density of 1.010-1.022, water temperature of 5-35℃, pH of 7.5-8.3. The water source is mainly based on natural tides, and it is best if the pond can be filled with water regardless of high or low tides.

② Terrain and bottom texture. The terrain should be flat and have a small slope, so that it is easy to flood and drain. The bottom texture should be hard mud or sandy mud, and soft mud should not be used.

③ Area and water depth. The area should generally be around 100 mu, and 50 to 60 mu is ideal. If the area is too large, it will be unfavorable for pond water renewal, water level regulation, and production management between ponds; if the area is too small, the water quality for shrimp farming and feeding will change easily. The water storage depth of the shrimp pond should be 1.5 to 2.5 meters, and the water level of the clam pond should be 1.0 to 1.5 meters.

④ Prepare the yard. Generally, the width of the ridge is 3 to 5 meters, the height is 50 to 80 centimeters, and the length is determined according to the actual shrimp pond. The distance between the ridges is 60 to 70 centimeters to facilitate stocking and yard management. About 10 days before stocking, the clam yard should be shallowly hoeed and then soaked in water for 2 to 3 days, then drained and the ground should be raked and smoothed to prevent the attachment and growth of Enteromorpha, and to facilitate the attachment and growth of seedlings. Generally, clams are raised in the upper and middle yards, and the lower yard (low yard) is used as a bait table. The clam yard area should account for 20% to 25% of the shrimp pond.

⑤ Clean the pond. Before stocking shrimps and clams, remove the silt, bait residues and cracked mudflat surface in the pond, and then store water for drug disinfection. Tea cakes, quicklime or bleaching powder can be used for disinfection. After the shrimp pond is dredged, decontaminated, and poisoned, it is filtered through a 60-80 mesh silk sieve and the water is added to the pond for washing to prevent all kinds of harmful eggs from entering.

(2) Stocking of clam seedlings

① Sowing time. The earlier the clam seedlings are stocked, the better. It usually starts in the first to middle ten days of the lunar March and ends in early April. Usually, clams are stocked before shrimps to prevent the clams from being harmed by shrimps.

② Stocking density. Generally, the ideal stocking density is 8,000 to 12,000 clams/kg and 30 to 50 kg of clams per mu of pond water surface, and the appropriate stocking density for shrimps is 10,000 to 15,000 per mu.

③ Stocking method. When sowing clam seedlings, leave a space of 10 to 20 cm wide on both sides of the clam field for the clam seedlings to move and burrow, so as to avoid entering the ditch; store water for seedlings, the water level in the clam field should be 15 to 20 cm, and the seedlings should be released evenly; it is not advisable to release seedlings under scorching sun or heavy rain.

(3) Production management

① Fertilization and bait cultivation. After the stocking of clam fry and before the stocking of shrimp fry, apply sufficient basal fertilizer to cultivate bait plankton, apply 50 kg of manure (chicken manure) and 10 kg of urea per mu, so that the water color in the pond is yellow-green or light brown. After the shrimp fry are released, topdressing should be applied once every half a month or so, depending on the water color. In July and August, when the water temperature rises and the bait in the pond is abundant, stop fertilizing. Topdressing should be continued after the shrimp are harvested.

② Adjust water in time. Start to add water gradually 15-20 days after the shrimp fry are released, and then adjust the water level of the clam pond in time according to the season. The water is deep when the temperature is high and shallow when the temperature is low. Add new water in time after heavy rain to prevent excessive fresh water. Water should also be added appropriately before cold air; the amount of water change should be increased in the middle and late stages of breeding, and the water level of the clam pond should drop to 30-40 cm after the shrimp is harvested.

③ Clear the Enteromorpha. From early June to late October, Enteromorpha is very likely to grow in shrimp ponds, which not only consumes nutrients in the water, but also covers the clam beds, affecting the normal production of clam seedlings. You can choose to dry up the clam beds in the morning or evening during high tide, and remove and clean them.

④ Feeding the shrimp pond. Shrimp mainly feed on fresh bait or compound bait, while clams feed on plankton in the water. Feed the shrimp regularly and at designated locations to ensure that the shrimp are well fed. The feeding table should be far away from the clam pond to prevent the shrimp from going to the clam pond to look for food and dig up the fry due to insufficient feeding, which will affect the growth and survival of the clam fry.

⑤ Clear the field and prevent pests. From July to August, drain the water in the afternoon during the high tide season, let the clam pond dry for 2 to 3 hours, use tea seed cake to poison fish (predators), replace with fresh seawater as soon as the tide rises, and replace damaged sieves in time. Feed medicated bait for 2 to 3 days every half month to prevent shrimp diseases.

(4) After collecting clam fry and culturing for 7 to 8 months, apply fertilizer and keep it for about half a month to one month after the shrimps are harvested, then drain and harvest.

This article is from: "History of the Development of Agricultural and Animal Husbandry Science and Technology in Tibet" published by China Agricultural Press

4. What kind of drugs are used to poison fish in the river? What are the side effects of taking them?

This is really unclear, I suggest you go to Doc88 to ask.