How to cultivate fish species

Fish species can be divided into fry and fingerlings depending on the stage of growth. Freshly hatched fish from fish eggs are called fry. After several stages of fry cultivation, the body gradually grew up and was called a fingerling. The development of fingerlings from fry generally takes three stages. The first is the summer flowering stage, the second is the cultivation of first-year fingerlings, and the third is the cultivation of second-instar fingerlings.
Let us first talk about the first cultivation stage of the species, namely the summer cultivation stage.
It takes about 20 to 30 days to grow from fry to summer flowers. During this period, because the fry is small, fragile and delicate, its activity ability is poor, and its adaptability is not strong, it must be especially careful during the breeding process.
First of all, to cultivate fish ponds, it is best to choose where irrigation and irrigation are convenient, soil quality is good, water retention is strong, and ventilation is sunny. The area of ​​fish ponds should not be too large. In general, the fish pond area of ​​fish fry is suitable for 1 to 2 mu. About one and a half months before the fry hatching, the fish ponds must be cleared first, then disinfected with quicklime, bleach and other drugs before the fry can be put in for feeding. The depth of fish ponds is 0.5 to 1 meter.
Second, let the fry eat well. At this stage, fish fry mainly eat zooplankton, and also eat some artificially-fed soybean milk. According to this eating characteristic of the fry, it is necessary to fertilize more fish in the pond, cultivate plankton, and provide sufficient food for the fry. Fertilize in the pool, can be applied to animal excrement, can also be green manure water or chemical fertilizer. The usual practice is to fertilize the water before fertilizing the basal fertilizer 3 to 5 days before the fish. 50-100 kg of green manure per acre, or more, the entire pool evenly. If you want to fertilize the water quickly, you can apply some nitrogen fertilizer. After fry under the pool, every 5 to 7 days will chase a fat. When topdressing, according to the thin water quality, the weather, and the growth status of the fry, it is necessary to reduce the amount of waste water and maintain the water quality. Experience has shown that the color of the water in the fish pond is suitable for tea brown or yellowish green.
When the fry is fed with milk, it is necessary to brew the soybeans with bubbling, grind them into milk, and evenly sprinkle them into the pool. Every day, use 2.5 kg of beans to grind the soybean milk into soybean milk. Sprinkle several times into the fish pond. When splashing, it is required that the slurry be small and even. When squid and squid are raised, soy milk should be sprinkled all over the pool; when cultivating grass carp and herring, be sure to splash more at the poolside.
The second stage of fingerling breeding is the one-year-old fish breeding stage. After fry cultivation, the body grows to 3.3 centimeters in length, which is called summer flower. The constitution of the summer fish species is still very weak, and it is not suitable to be directly used for culturing as adult fish. It is necessary to continue breeding for a period of time and this will be transferred to the cultivation stage of the first-instar fish species. First age is the meaning of the year. The hatched fry in the spring takes about one month from the summer flowers, and then raises the summer flowers to the fall. The fish grows to 12 to 15 centimeters. The fish species at this time is called the first-year fingerling. In the cultivation of first-year fish species, different fish species must be kept separately in size.
Is it good to keep a fish in a fish pond? Or is it suitable to mix and raise? Practice has proved that several kinds of fish are better mixed with polyculture. There are no uniform rules on how to match, and each place has its own approach. In general, it is necessary to adjust to local conditions. In general, fish ponds based on squid and squid tend to have more fish, which can account for 70% to 80%, and in addition to 20% to 30% of grass carp, herring, squid, etc. Fish. This kind of fish pond is dominated by fertilization, and some feeds are properly fed. The role of fertilization is to cultivate large amounts of plankton as fish bait. Apply fertilizer every 7-10 days to keep the water quality productive. Fish ponds, such as grass carp, squid, squid, and other food-eating fish, can be used with about 30% of carp and squid. This type of fish pond is mainly fed with bait and appropriate fertilizer is applied. Foods such as soymilk, bran, and cereal flour are usually used for bait. On average, every 10,000 species of fish can feed 2.5 kg of bait each day. Grass carp is best fed with some plants such as duckweed. On average, every 10,000 species of fish are fed with about 25 kilograms per day. Some methods for feeding fish are to use a banquet table or other things to form a food table at the fish pond, or to form a food court using bamboo, etc., and put the bait on the food table or the food farm twice a day for the fish to arrive. Fix the venue to eat. The number of baits to be given to fish should be controlled flexibly. Because the fish species gradually grow, if the amount of bait being put in does not increase, the fish will not be able to eat enough and will affect the growth. On the contrary, if there are too many baits, it will cause waste if the fish cannot be eaten. It is generally appropriate to eat in two to three hours after each feeding.
In the one-year-old fish culture stage, the growth rate of fish is relatively fast, and the size differentiation is also obvious. In order to increase the survival rate of small fish and promote the normal growth of small fish, it is necessary to make timely adjustments and take measures to increase the size of small fish to keep small and large fish species separately.
Usually, one-year-old fish can be used to grow adult fish. However, in order to make the adult fish produce better results, in recent years, attention has been generally paid to the cultivation of large-sized fingerlings, requiring that the fish be more than 15 cm long and weigh more than 50 grams. Practice has proved that such specification requirements are not difficult to achieve. As long as the stocking density is properly adjusted, the problem of feed fertilizers is solved, fine feeding is carried out, combined with measures such as early stocking and timely pond separation, large-scale fish species larger than 15 cm can be cultivated.
In the spring of the second year, the first-year-old fish species after wintering will continue to be cultivated for 1 year at a density of 1,000 to 2,000 fish per acre. When the fish species grows to 150 to 250 grams, they become second-instar fish species. During this period, a combination of feeding and fertilization should be adopted. The survival rate of second-instar fish is very high, and the growth rate is also very fast. When raising fish, when stocking some of the second-instar fish species, you can take technical measures to catch the fish, which can effectively increase fish production.

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