Method of feeding squid

Most species of carp live in fresh water such as ponds and rivers. Some species live in seawater. They have low water quality requirements, and are characterized by fast growth, easy breeding, wide eating habits and few diseases. The artificial breeding benefits are good. This issue introduces a group of carp culture techniques for farmers' reference.

1

Choose good fish species

Feed the squid to maintain good water quality, and start fertilizing the water one week before the fish pond is disinfected and the fry are stocked. Some water floating lotuses can be planted on the water surface to protect the shade, prevent escape and regulate water quality. The pool water must be replaced frequently. Generally, 1/3 pool water must be replaced in 10~15 days. The change of water quality in the pool should be observed frequently. Generally, the water quality is yellow-green. If the fishery is found to be out of the water surface, it means that the pool water is deficient in oxygen in the fertilizer water, and new water should be injected in time to drain the old water. Especially in the sweltering or thunderstorm weather, it is necessary to pay attention to the new water in time to increase oxygen. If necessary, you can also install an aerator to increase oxygen to prevent dead fish. After the water injection reaches 0.9 meters, the biogas residue can be used as the base of the fish pond, and about 250 grams of biogas residue is placed per square meter of fish pond.

When a large number of rotifers appear in the pool water, the carp fry should be placed. The stocking of the fry should be harmless, disease-free, healthy and lively. The size of the fish should be more than 3 cm, and the size should be as uniform as possible to avoid killing each other. When the fry are placed, disinfect the fish body, dilute 1 kg of salt with 30 kg of water, and soak the fry in salt water for 5 minutes before placing the seedlings. A small amount of pool water can be placed in a container before putting the seedlings, and several fry are put into the trial. If the fry live normally within a day, the fry can be placed in the fish pond. The stocking time is suitable on sunny days. Generally, the acre is 3 cm long and the carp is 6,000 to 10,000. Every 2 to 3 days, add new water once, and then apply a small amount of fertilizer.

2

Scientific feeding of bait

The newly hatched fry are completely protected by their own yolk. The yolk begins to disappear slowly in about 2 days. When the larvae can swim horizontally, they can eat at the mouth of the pond. The fry open feed can be cooked with egg yolk or small cladocerans and copepods plankton. Cook the eggs, remove the egg yolk and wrap it in gauze. Squeeze the egg yolk in the water-filled dish to form a yolk granule slurry. As the fish grows up, it can be fed with leeches, mosquito larvae, leeches, maggots and various small fish fry, or feed some silkworm pupa powder, pig blood, and artificial seedlings. It is advisable to feed the amount of bait in the pool before the next feeding, so as to avoid the residual feeding of the fry due to insufficient feeding.

Freshly shipped fry, weak resistance, and different specifications, if directly placed in the pond, because the fry activity range, physical exertion, and the input of the bait is difficult to eat, resulting in wasted, still Will pollute the water. It can be concentrated in the small pond and then placed in the pond for breeding. This is easy to manage, and allows the fry to better adapt to the new environment, and easy to get enough food in the pond to promote its rapid growth. When the body length of the carp has grown to 5 to 7 cm, it is necessary to grasp the tamer and feed the artificial bait. The protein content in the feed is more than 45%. The nets are divided into different sizes of fish to avoid mutual eating. .

When the fry cultivated in Xiaotang reaches about 10~15 cm, the large fish species can be screened from the pond and placed in the pond. The small fish species remain in the pond for intensive cultivation, so that the fish species grow in balance. The specifications are the same, avoiding the phenomenon that big fish eat small fish, thus effectively improving the survival rate and unit yield of the fry.

Carp is an omnivorous fish, and it is sexually gluttonous. Therefore, it is necessary to correctly grasp the amount of feed, so that there are many fish in the pond and how much to feed, to prevent blind feeding. At the same time, it is necessary to carry out point feeding, spread the bait evenly, a small amount of meals, and feed enough to prevent the phenomenon of polarization caused by hunger and satiety. At the same time, in the early stage of fry breeding, animal feed should be mainly used for intensive cultivation. As the fish grows, some plant feeds are gradually transferred to achieve animal and plant feed. The amount of daily feeding should be controlled at 5% to 8% of the total weight of the fish. The feeding amount should be adjusted once every 1 week or half a month to make the feeding amount more reasonable.

Feeding should be timed, fed regularly every day, once in the morning and afternoon; second, quantitative, each feeding amount is 3 to 4 hours after feeding, and the daily feeding amount is about the total weight of the fish in the pool. About 5%, depending on the weather and fish feeding situation, increase or decrease.

3

Strengthen breeding management

The breeding period of squid is between March and May, and the middle and northern parts are about one month slower than the south. First, the female and male fish with good maturity are selected. Each group selects three females and one male fish into each group. In the bucket network.

The female carp is easier to distinguish during the breeding period. At this time, the female's abdomen is swollen and soft, the genital hole is round and red, and the anus is not concave. The pale abdomen is discharged by gently pressing the abdomen with a finger.

The male fish is slender and long, the lower abdomen is relatively flat, the genital orifice is narrow and long, and the pectoral fin is usually larger than the female body of the same length. The finger is lightly pressed, and the mature fish will discharge a small amount of white semen.

Before picking the eggs, touch the hand to check the softness of the belly of the female fish and gently squeeze it. If there is egg production, the egg is collected by dry guiding method; if there is no egg production, wait for a while before going an examination.

First, the female fish that can ovulate is taken. One person wraps the abdomen with gauze, and the genital hole is oriented toward the porcelain or container for egg collection. The container must be clean and waterless. The other person catches the tail of the female fish and gently squeezes the anus. Press, the egg is slowly extruded into the container.

Pour in the prepared sperm suspension, stir with feathers, and add clean water to wash away the excess sperm. After several times, the insemination is completed. The fertilized egg is spherical, greenish yellow, slightly reddish, and has a diameter of 1.65 to 1.8 mm.

The fertilized egg is not sticky at first, and it is sticky after about 20 minutes. The fertilized egg should be spread on the attached egg before it is sticky. Generally, the material such as screen net can be attached and gently stirred with feathers to make the fertilized egg. Evenly attached, if the egg is too densely attached, it will affect the hatching rate.

4

Strengthen disease prevention and control

Viral rotten fin disease is the most harmful, mostly after the stocking of the fry for 1 month, when the body weight is about 50 grams. Blisters appear on the surface of sick fish, the base of the fins is congested, there is rot, severe systemic ulcers, and a large number of dead fish appear until the whole army is destroyed. You can use 10,000 units of bleaching powder liquid to splash the whole pool.

The parasitic disease can be sprayed with 0.4 million units of crystal trichlorfon or 0.6 to 0.7 million units of copper sulfate and ferrous sulfate mixture 5:2.

Enteritis disease insists on not feeding moldy and spoiled feed, regularly adding 0.05% to 0.1% fresh garlic juice to the feed, and adding 20 to 100 grams of oxytetracycline powder per 100 kg of feed, and feeding for 5 to 7 days.

Black body disease The fish body is black, thin, and stops eating. In severe cases, the fish body often heads up and hangs on the surface of the water until it dies. After examination, there is a round red blood spot on the inner side of the pectoral fin, the fins are ulcerated, and there are mildew spots on the back of the head. The diseased fry stage is easy to be infected, the bait is not good enough for the disease, the disease is fast, and the infection is rapid. The water should be kept clean and no unfermented fertilizer should be used. Use gallnuts 2 to 4 grams per cubic meter, 30 grams of lime water per liter of the whole pool, every other day, spill 2 to 3 times.

The bubble disease fish floats on the surface of the water, the abdomen is facing the sky, there is a bubble in the abdomen, and it cannot sink. Mainly due to the application of too much unfermented organic fertilizer in the pool, or the water quality in the pool is aging, there are too many blue and green algae in the water, the water in the water is too saturated under strong light, and the fish eats bubbles. When the transparency of the pool water is too small, it is not advisable to put the fry; after the onset, the new water is quickly injected, and sufficient live bait is thrown to allow some fry to discharge air bubbles and return to normal; each water depth is 1 meter, and 1.5 to 2 kg of salt is used to water the whole pool. Splashing, has a certain effect.

This column is provided by Liu Joy