CATDOLL : CATDOLL: Can carp be raised in cages?

1. Can carp be raised in cages?

Where are you??? There might be an earthquake soon!!!

1. The time to enter the cage: When carp first enter the cage, they often swim against the water, and if there is wind and waves, they will swim more violently, which consumes a lot of energy. At the same time, the nets can easily scratch the surface of the fish. Therefore, the time to enter the cage is after the last cold wave.

2. The stocking density of carp in boxes is 40-50 times higher than that of pond culture. To achieve a survival rate of more than 90%, the stocking density should be controlled below 146 fish/m2.

3. Fishing and transportation Three days before the fishing, feeding should be stopped. When fishing, the water in the pond should be kept at 30-40 cm. Use a trawl net to avoid fishing in a dry pond. The caught fish should be temporarily kept in a bundle box for 4-5 hours before transportation.

4. Feeding in the net cage usually starts on the second day after the fish are put into the cage. Feeding should be done in small amounts and multiple times, once every 2-3 hours. The amount of feed depends on the fish's eating habits.

5. Nutritional requirements Minerals and trace elements are essential nutrients for carp culture in cages. When carp is highly intensively cultured, these substances should account for 4%-5% of the total dry feed.

1. Minerals Minerals such as calcium and phosphorus are important components of bones. 99% of the total calcium and 80% of the total phosphorus in fish are present in bones. It is generally believed in China that when carp is cultured in cages, the ratio of calcium to scale is 1:1, and the absolute amount of calcium salt and phosphorus salt added in the feed is slightly greater than 1. In order to maintain the acid-base balance in the fish body and regulate the osmotic pressure in the body, when preparing carp feed mainly based on plant raw materials, about 0.5% of salt should generally be added to promote the growth and development of carp. Magnesium is an activating factor for cholinesterase, etc. Adding 60-70 mg of magnesium to 100 grams of dry feed can significantly promote the growth of carp and improve feed conversion rate.

2. Trace elements At present, the following trace elements are mainly used in China: Cobalt is an anti-anemia factor and growth factor. Adding 3 grams of cobalt chloride to each ton of carp feed can accelerate the growth of carp by 15%-20% and reduce the feed cost by 20%; Copper is a coenzyme of urease, tyrosinase, and lysine oxidase, and is closely related to blood circulation. Adding 3ppm of copper to carp feed has a good promoting effect on the growth and development of fish: Adding 13ppm of manganese to carp feed can increase the growth rate and prevent bone formation from being blocked; Iron is a component of hydrogen peroxide and peroxidase, and is involved in blood circulation. Adding 80ppm of iron to carp feed can ensure the rapid growth of caged carp.

2. How to design the cage for eel farming

The cage can be made of polyethylene mesh with specifications of 3m*8m*1.5m. The upper edge is 0.5m higher than the bank of the pond. The joints are tightly twisted to prevent the eels from escaping. The four corners are fixed with bamboo. After the setting is completed, a layer of hard mud blocks 0.35~0.4 meters thick is piled on the bottom of the box. The middle of the mud blocks is filled with crop straw to play a supporting role, which is convenient for the eels to burrow. After adding water, water peanuts are transplanted into the cage to provide shade for the eels. I suggest you search Zeng Shuangming's eel breeding technology on Baidu, which is very detailed.

3. Fishing net: one finger means the mesh size is a few centimeters, two fingers means the mesh size is a few centimeters, three fingers means the mesh size is a few centimeters.

The mesh size of a fishing net is 1 cm. Fishing nets are usually divided by the size of the holes, such as (1 finger, 2 fingers, 2 and a half fingers, 3 fingers, 3 and a half fingers, 4 fingers, 5 fingers...), 1 finger is 1 cm, 2 fingers is 2 cm, and so on. This centimeter length refers to the side length of the square on the fishing net.

1 refers to the reference fishing range: whitebait, horsemouth, club flower, wheat ear, boat minnow, goby, etc.

2 refers to the reference fishing range: yellow catfish, small crucian carp, large whitebait, etc.

3 refers to the reference fishing range: crucian carp, etc. (about 2 to 8 taels).

【Extended information】

When fishermen use fishing nets to catch fish, they do not use very dense fishing nets. First, if small fish are caught in the net, they will immediately realize that danger is approaching after touching the net, so they will flee everywhere, which will alarm the big fish that have not yet touched the net. The big fish will also realize the danger is coming and will take evasive and escaping measures, so the chance of catching big fish is greatly reduced. Second, the low commercial value of small fish will also affect the reproduction of fish. Large fisheries will close the nets during the breeding season for the same reason. In addition, choosing the starting point for casting the net is also very important. Pulling the net in the direction of more fish and pulling the net in the direction of fewer fish will produce completely different results.

Fishing net, a net used for fishing. Structural material for special fishing tools. More than 99% are made of synthetic fibers. They are mainly monofilaments, multifilaments or multi-monofilaments of nylon 6 or modified nylon. Polyethylene, polyester, polyvinylidene chloride and other fibers can also be used. Fishing nets have many functions. Fishing nets are divided into gill nets, trawl nets, purse seine nets, net building and net laying according to their functions. They are required to have high transparency (partial nylon nets) and strength, good impact resistance, wear resistance, mesh size stability and softness, and appropriate elongation at break (22% to 25%). They are made of monofilament, multifilament twisted yarn (knotted net) or monofilament warp knitting (raschel, knotless net), primary heat treatment (fixed knots), dyeing and secondary heat treatment (fixed mesh size).

In ancient times, people used coarse cloth and hemp as raw materials, and made fish nets by bundling and rolling. Although this kind of fishing net is easy to rot and has poor toughness, its fishing efficiency has been greatly improved. With the development of fisheries, the objects of fishing and hunting are not only fish, but also the fishing tools are advancing with the times. Modern fishing nets are mainly processed with raw materials such as polyethylene and nylon. They have a longer service life and higher fishing efficiency, and are classified by different ways of use. For example, the casting nets (hand nets, hand-throwing nets) used in traditional fishing, the trawl nets powered by boats, and the drift nets (triple nets, purse seine nets) with different mesh sizes to trap fish. These nets are woven with meshes of different sizes and wires of different materials for different fishing objects. At the same time, with the development of fishing nets, various fishing tools have also emerged, such as fishing cages and four-corner nets as common fishing tools.

4. How many grass carps can be raised in one square cage?

This depends on the size of the fish; generally, 10 pairs (about 20 fish) of adult fish are appropriate. The water depth is within 30 cm, and the fish can grow normally.

5. What are the requirements for cage specifications for cage fish farming?

The shape of the net cage currently used has square, rectangular, circular, hexagonal, octagonal and other shapes, square (mostly for grazing fish) and rectangular (mostly for filter-feeding fish) are more commonly used. The size of the net cage varies, and the size of the net cage is preferably about 20-30m2, and 2.5-3m high. The mesh size of the box body is closely related to the specification of the stocked fish species, and the size of the mesh is determined by the size of the fish raised in the box. The mesh of the current breeding net cage is 1.0-1.5cm, and the mesh of the fish cage is generally about 3cm.