High-yield culture methods of crucian carp

In recent years, crucian carp has become one of the most popular species in freshwater culture because of its strong adaptability, miscellaneous diet, fast growth, strong disease resistance and delicious meat. So, the pond main culture crucian carp how to get out of the pond to achieve high yield?

Appropriate density

In order to reduce the culture cost, it is best to cultivate large-size crucian carp species in ponds, stocking 0.8-12000 crucian carp summer flowers per mu, and then turn to adult fish culture in ponds after 50MUR 60g. The best breeding density is 1500mur1800 fish with 50mu 60g of fish per mu, so that the specification of commercial fish can reach more than 350Mel 400g.

Matching variety

The cultivation of large crucian carp species should not be matched with grass carp and carp, but silver carp and bighead carp should be selected, accounting for about 20% of the main cultured crucian carp, and bighead carp account for about 10% of silver carp. The stocking time of matching varieties should not be early, especially the early input of bighead carp has a greater effect on the domestication of crucian carp.

Domestication of fish species

Crucian carp is a kind of fish living in the middle and lower layers of the water body. The fish ponds that mainly raise crucian carp must be domesticated so that all crucian carp can float and grab food quickly after feeding, which is very beneficial to the growth of crucian carp. Five points should be paid attention to during domestication: first, it is relatively easy to domesticate fish in the stage of breeding; second, appropriate additives can be added to feed during domestication to shorten the domestication time; third, when the release density has been determined, during domestication, the water level in the pond can be lowered and the density can be relatively increased, which is more conducive to domestication; fourth, silver carp and bighead carp fingerling should be released after the floating and grazing habits of the main cultured crucian carp have been formed. Fifth, during the domestication period, the pond water quality should be "thin" rather than "turbid fertilizer".

Feed particle size

The feed size of crucian carp should be "small but not large". Crucian carp with a size of less than 10 grams should choose feed with a particle size of 0.5 mm, 1 mm for 10 mi 30 grams, 1.5 mm for 30 mi 75 grams, 2 mm for 75 mi 100 grams, 2.5 mm for 150 mi 300 grams, and 3.2 mm for more than 300 grams.

The feeding rate of crucian carp culture ponds should depend on the size of crucian carp and the water temperature of the pond. The feeding rate is 3.5% when the specification is 25mur50 grams; the feeding rate is 1.7 percent when the specification is 100 grams; when 100 grams are specified, it is 1.7 percent; when 100 grams is 100 grams, it is 1.4 percent; when 200 grams is 200 grams, the rate is 1.4 percent; when 200 grams is 200 grams, it is 1.2 percent, 2.3 percent, and 1.9 percent when the weight is more than 300 grams. When the water temperature is lower than 15 ℃, the feeding rate is the lowest; when the water temperature is 16 ℃, the feeding rate of crucian carp is stronger, and the feeding rate is the average; when the water temperature is 24 ℃, the feeding rate of crucian carp is the most exuberant period, and the feeding rate should be the highest to ensure adequate feed.

Epidemic disease control

Crucian carp have strong disease resistance and no major infectious diseases. Relatively speaking, the hemorrhagic anchor head disease is more harmful, which is mainly characterized by weak slow swimming and pale color of crucian carp, needle parasitism can be seen on both sides of the abdomen and back of the fish, and there are hyperemia erythema the size of mung bean or pea. The scales of the focus were loose or shedding, mucus increased, and a few formed obvious ulcers. During the onset season, 0.3 grams of 90% crystal trichlorfon is sprinkled on a small main pond every half a month; for a large area of crucian carp culture pond, a basket (bag) of trichlorfon can be used around the food farm, once a month, twice a month for 2 days, all of which have a good preventive effect. For the sick pond, 90% crystal trichlorfon 0.5 g and 0.2 g ferrous sulfate mixture can be sprinkled once per cubic meter, and the effect is better.