CATDOLL : Catdoll: How to choose fry

1. How to select fish fry

Recommended for collection: To select fry, you need to select high-quality fry with strong physique and strong vitality. The methods can be summarized as follows: 1. Look at the pigmentation of the fry group. The color of high-quality fry is consistent, there is no dead white fry, the body is clean, slightly dark blue (except carp), and the color of low-quality fry is different, it is a colorful fry, and the body is black and gray. 2. Look at the swimming situation of the fry. Use your hands or a wooden stick to stir the water in the fish basket into a vortex. High-quality fry swim against the current and swim to the side, while low-quality fry swirl in the middle and swim with the current. 3. Sampling inspection. Use a porcelain plate to fill the plate with fry and water, blow hard with your mouth flat on the edge of the plate, and the fish swimming in groups against the wind are high-quality, and those drifting with the wind are low-quality. You can also slowly pour out the water in the plate. The fry with their backs facing up, the tail curled into an arc and moving back and forth are high-quality, and the fish with the body wall close to the bottom of the plate and not moving are low-quality. Li De@Li De (This article has 1 page in total) How to get this article >>

Selecting fish fry may seem simple, but it actually involves a lot of knowledge and must be selected by professionals!

2. Black carp breeding technology, how to feed it to grow fast, do black carp eat small fry

1. Environmental conditions: There should be a large water source near the pond, the water quality should be clear and clean, and the pond area should be within 5 mu. 2. Pond disinfection: Clean the sludge in the pond, and then disinfect it with lime or bleaching powder. 3. Cultivation of bait: One week before stocking, cultivate plankton, generally organic fertilizer, amino acid fertilizer paste, etc. can be used. 4. Stocking fry: Before stocking, soak in salt solution for 10 minutes, and then release 2,000 fry of 5 cm in length per mu.

1. Herring breeding technology

1. Environmental conditions

(1) There must be a large water source near the breeding pond, and the water quality must be clear and clean. Under normal circumstances, if there is no chemical plant or mine nearby, the water quality can mostly meet the requirements (the breeding pond does not need to be near a river).

(2) Ponds are generally oriented east-west and can be built in well-ventilated and well-lit areas. The area should be within 5 mu and should not exceed 10 mu.

(3) Before breeding, oxygenation equipment, pumping equipment, and power maintenance facilities must be prepared.

2. Pond disinfection

(1) Only 10 cm of silt should be retained in the pond, and the rest should be cleaned up (new soil can be replaced after the silt is cleaned up), and then disinfected with lime or bleaching powder (if it is in the north, winter is not suitable for breeding black carp, but pond cleaning can be done in winter). The amount of quicklime used is 200 catties/mu.

(2) The banks of the pond should be reinforced and any damaged areas should be repaired promptly.

3. Cultivate bait

One week before stocking the fry, use organic fertilizer, lime, and chicken manure in the pond, with 600 kilograms per mu. Three days later, use amino acid fertilizer paste, with a dosage of 2 kilograms per mu, so that some plankton can be cultivated.

4. Stocking fish fry

(1) After the bait is cultivated, start stocking. Select healthy, energetic, uniform-sized, and disease-free fry for stocking. Before stocking, soak the fry in 4% salt solution for about 10 minutes to kill the bacteria on their body surface.

(2) The stocking quantity should be such that there are clear gaps visible on the water surface. Generally, 2,000 5-cm-long fry can be stocked per acre of pond.

(3) After stocking, use amino acid fertilizer paste once every two weeks, with a dosage of 1.6 catties per mu, to increase the number of plankton.

5. Feed properly

(1) From May to June, feed 4 times a day. From July to September, feed 3 times a day. After October, feed 2 times a day. Fresh feed can be snails (or clam meat, insect larvae), 400 kilograms per mu, and plant feed can be corn, wheat bran, and soybean cake.

(2) During the breeding process, do a good job of disinfection and pay attention to maintaining water quality.

2. How to feed black carp to make it grow faster

1. Feeding method

(1) Black carp fry mainly feed on plankton. When they grow up, they can be fed with snails, clams, shrimps, aquatic insects, etc. When they are fed artificially, special feeds need to be prepared for them. Generally, hay powder, silkworm pupae, vegetable cakes, and barley can be mixed in a ratio of 4:3:1:2 and then fed.

(2) If you want to raise other fish together, you can use fish meal, soybean cake, rapeseed cake, wheat bran, barley, and corn as feed, and then add a large amount of crude protein to promote the growth of fry.

2. Feed selection

(1) Pellet feed

Usually you can choose to use artificial compound feed with a crude protein content of more than 30%. The feed particle size is required to be 4 mm and the length is 1.5-2 times the particle size.

(2) Formulated feed

① Vegetable cake 10%, barley 20%, hay powder 40%, silkworm pupae 30%.

② Rapeseed cake 5%, soybean cake 10%, silkworm pupae 5%, wheat 5%, green hay 40%, cotton cake 30%, fish meal 5%.

③Soybean cake 47.5%, fish meal 35%, yeast 1%, inorganic salts and other substances 16.5%.

3. Do black carp eat small fish fry?

1. Generally speaking, black carp will not eat small fish fry or fish eggs because they are not very interested in other fish, and they are not active and do not swim fast. Their food mainly consists of some slow-moving animals, such as shrimps, clams, snails, etc.

2. Although black carp generally does not eat small fish fry, it is recommended not to raise them together with fish fry, or to raise them together, to prevent the fish fry from being accidentally eaten by black carp.

3. How to eat herring fry weighing more than one pound

Hello, more than a pound of black carp fry can be fried and then braised. The specific method is to first remove the internal organs and scales of the black carp, then clean it, then prepare the ingredients, chop the ginger, garlic and green pepper together, heat oil in a pan, add the processed black carp fry, fry until golden, then remove and set aside. Leave an appropriate amount of oil in the pan, add oil and bean paste, then add a bowl of water, add a spoonful of salt, two spoonfuls of soy sauce, a spoonful of dark soy sauce, and three spoonfuls of MSG. After the water boils, put in the fried fish, and add ginger, garlic and green pepper at the same time. Simmer on medium heat for 15 minutes and then remove from the pan.

4. How to raise black carp

1. Pond conditions

It is better to choose a place with sufficient water source, convenient drainage and irrigation, no pollution source, ventilation and sunshine, and convenient transportation. The water quality is good, and the transparency is 30-40cm.

Fishpond requirements:

Fish pond type Area m2 Water depth m Bottom silt thickness Pond cleaning

Fish pond 667-2500 1-1.5 Flat soil <20cm Clean the pond 15 days ago

1-year-old pool 2000-4000 1.5-2 <30cm

2-year-old pool 3500-5000 1.8-2.2 <40cm

Adult fish pond 5000-10000 2-2.5 <40cm

In fish breeding and adult fish rearing ponds, feeding areas (or feeding tables) should be designated. The feeding areas are required to be flat, free of silt, and kept clean and hygienic all year round.

2. Fry cultivation

Apply 6000-7000kg/hectare of green manure or 3000-4000kg/hectare of manure 5-7 days before stocking. The organic fertilizer should be fermented, decomposed, and disinfected with 1-2% lime. Deepen the water to 0.5 meters 2-3 days after fertilization, and deepen to 0.6-0.7 meters after 5 days. Use a dense mesh to filter the water when it enters.

3. Fish fry stocking

Choose a windward location in sunny weather, release the fish that have been filmed for 5-7 days, and set the stocking density at 1 million to 1.5 million per hectare. Make sure the temperature difference does not exceed 2°C.

4. Feeding and Management

Soy milk is applied on the 1st to 10th day, 30kg/ha for the first 5 days, 40kg/ha for the last 5 days, and the amount is increased after 10 days, twice a day, evenly sprinkled throughout the pond. Add 15-20cm of water every 5-7 days, and add to a water depth of 1.3-1.5 meters when the summer flowers are removed from the pond. Apply topdressing in appropriate amounts according to the water quality of the cultivation pond. After about 25 days of cultivation, the fry will become summer flower fingerlings and should be sparsely divided into ponds, and 2-3 intensive exercises should be performed before leaving the pond.

5. One-year-old fingerling cultivation

The stocking time is before the summer solstice, with 80,000 to 100,000 black carp per hectare, 18,000 to 20,000 bighead carp per hectare, and 5,000 crucian carp per hectare.

First use a small amount of fine feed to lure the black carp to the feeding table, then feed bean cake slurry twice a day, 2-3kg/time per 10,000 fish. After 5cm, mix it with vegetable cakes, after 7cm, switch to soaked vegetable cakes or bean cakes, after 10cm, mix it with crushed snails, start with 30kg/10,000 fish, and then gradually increase the amount.

Implement "four fixed" when feeding. Fixed point: feeding table or feeding field; fixed time: twice a day, 8-9 am, 2-3 pm; fixed quality: give high-quality fresh bait according to different growth stages; fixed quantity: each feeding should be finished in 1.5 hours, and the monthly feeding amount accounts for the proportion of the total feeding amount: 4% in June, 15% in July, 23% in August, 25% in September, 15% in October, 10% in November, 4% in December, and 4% in January-March. The feeding field should be cleaned and disinfected frequently to keep it hygienic. Water should be added frequently to control the fertilizer degree and dissolved oxygen. Patrol the pond twice a day in the morning and evening, observe carefully, arrange production according to the situation, and treat diseases in time. Keep production records. When the temperature drops to 10-5℃, the pond should be removed, the pond should be merged, and restocked. The winter stocking density is 25g/m3, change the water regularly, feed in small amounts, keep quiet, and keep the water depth at 1.8-2 meters.

6. Cultivation of 2- and 3-year-old fish

2-year-old black carp: 15,000-18,000/hectare, silver carp and bighead carp: 3,000/hectare, grass carp: 300/hectare, and crucian carp: 3,000/hectare.

3-year-old black carp: 5800-6200/ha, silver carp and bighead carp: 3,000/ha, grass carp: 300/ha, and crucian carp: 3,000/ha.

Feed mainly animal bait, supplemented by plant bait, or mixed bait, which should be fresh. In spring and autumn, when the disease is most prevalent, add more easily digestible food, and the feeding area should be larger. Keep the water fresh, disinfect the feeding area with drugs or use medicated bait to prevent and treat enteritis.

7. Fish breeding

1. Breeding method: 1500-1700 black carp/kg are stocked in the pond, and silver carp, crucian carp and grass carp are raised in the same pond.

2. Feeding and management: Add water once every 10 days and keep the water depth at 2m.

3. Other production measures refer to fish breeding.

8. Fish disease prevention and control

Fish must be strictly disinfected before stocking. After they are put into the pond, 1g/m3 of crystal dichlorvos should be sprayed throughout the pond once. Then, they should be disinfected regularly with 25ppm quicklime, 1ppm bleaching powder, etc., and drugs to prevent enteritis should be fed regularly. The bait should be fresh and palatable. Dead fish should be fished out in time and buried deep in the soil. All fishing gear used should be soaked and disinfected.

The main diseases of black carp are as follows:

The main disease is enteritis, use 30-50 mg/kg of fish weight/day of norfloxacin, 5-10 g/kg of garlic weight.day, 0.5 g/kg of allicin weight.day. Sulfaguanidine 50 mg/kg of fish weight.day on the first day (double the dose for the first time), and continue for 6 days.

IX. Terminology

The fish are juveniles (fry) from the time they have just hatched to 7 days old.

After about a month of cultivation, the summer flower fish fry grows into fry over 3cm in length.

The one-year-old summer flower fry is cultivated for more than three months, and the grown fish in the same year have a size of 25-50g per fish.

2-year-old fingerlings are large-sized fish that are grown from 1-year-old fingerlings in the second year of breeding, with a size of 250-500g per fish.

The small black carp that is grown from 3-year-old fish and 2-year-old fish for another year (i.e. the third year) has a size of 1250-1750g per tail.

The adult fish are passed to the pond and the fingerling fish are raised for another year (the fourth winter) to produce edible fish, with a size of 5 kg per fish.

Black carp has good meat quality, few fine bones between the meat, delicious taste, high nutritional value and is regarded as a superior edible fish. Moreover, it is less prone to disease and grows fast. Generally, the weight gain of fish species is more than 7 times, and its breeding economic benefits are much higher than other conventional species. However, black carp is a carnivorous fish, mainly feeding on benthic animals, insect larvae, snails, clams, rice shrimps, etc. For a long time, due to the failure to solve the feed problem, it can only be used as a breeding variety and the breeding quantity is limited. With the development and application of complete pellet feed, it has become a reality to mainly breed black carp.

For ponds that mainly raise black carp, 250-300 kg of quicklime is used per mu to clean the pond. When cleaning the pond, the water depth is controlled between 0.2 and 0.3 meters to kill harmful organisms in the water. After 4 days, add filtered new water to a depth of 1.5 meters, and then the fish can be released. 350 black carp with a tail weight of 250 grams or 250 with a tail weight of 400 grams are released per mu. 80 silver carp with a tail weight of 100 grams, 20 bighead carp, and 20 grass carp with a tail weight of 100-150 grams are added. A small number of small-sized grass carp are released to feed on aquatic plants and shore weeds in the fish pond, which not only purifies the breeding environment, but also increases fish production by using natural bait; 2-3 black fish (snakehead) weighing 400 grams are released to control the reproduction and growth of wild fish and reduce the competitive pressure of competing with black carp for food and oxygen. Before entering the pond, the fish must be soaked and disinfected with a mixture of salt and trichlorfon.

Black carp has a high requirement for the protein content of feed, generally around 36%, and the proportion of fish meal in the feed should not be less than 15%. The daily feeding amount in the initial stage of stocking is 0.8% to 1.2% of the body weight of black carp (excluding other fish), and it is fed in 3 times. The diameter of the pellet feed is 3 mm. As the fish grows, the diameter of the feed can be 4 to 5 mm. In the growth season, the daily feeding amount is increased to 1.5% to 1.8%, and it should not exceed 2.0%. Feeding too much feed will reduce the digestion and absorption rate, and it is easy to form fatty liver.

The main breeding pond is prone to hypoxia, floating heads and dead fish due to high stocking density, fast fish growth and high fish carrying capacity. Water quality management must be strengthened. First, use aerators reasonably to give full play to their role in high-yield breeding. Second, add new water frequently to maintain the highest water level in the pond. Third, in the hot season, apply quicklime once every 15 to 20 days, with a dosage of 40 kg per mu, to make the water quality slightly alkaline and enhance the fish's ability to tolerate low oxygen.

The four major carps are all very hardy. As long as they haven’t died within a week after purchase, they are generally difficult to die and can be easily raised.