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As the yolk of the larvae gradually absorbs, the surface pigments of the fishes increase, the swimming ability increases, and the floating water starts to feed the outside world. As the date of floating of the fry is uneven, it is necessary to remove the floating larvae in time and feed it in another pool. It is also possible to keep feeding in the hatchery. According to the characteristics of the various stages of development of the fish seedlings, it is necessary to give nutritious and easy to digest feed. At the beginning of feeding, due to the fact that the fry did not have the habit of ingesting artificial feed, the feed should be sprinkled in every corner and only some feeds should be used. The cooked egg yolk can be initially slurried to the top of the fish pond and the surface of the fish, allowing the fish to run into the yolk granules. After 14 to 15 days of eating, fry can concentrate on small pieces, and the feed can be dripped to the places where the fry are concentrated. After eating for 1 month, the cooked egg yolk can be extruded with gauze and dropped into fine particles. Later egg white can also be used together. In order to ensure complete nutrition, the animal can also use the animal's liver, fresh fish, etc., to form a paste, drip into the surface of the water, or put it on the fine wire mesh, hang it in the pool, let the fry slowly Feeding. After that, raw eggs and wheat flour are added to the paste feed, and they are cooked and rubbed into fine granules on fine wire mesh and fed 6 to 7 times a day.
The fry grows quickly under good conditions, and the body color changes from deep to shallow, slightly yellow, with black flower spots. If the feed is undernourished or poorly managed, the fish body will be dark, thin, and small and large. It will not be able to grab water at the downstream of the fish pond and eventually die.
2. Fish breeding
2.1 Feeds Rainbow Trout nutritional requirements for compound feed: crude protein 50% to 60%, crude fat 4% to 10%, crude fiber 1% to 3%, crude ash 10% to 15%, moisture 8% to 12%.
2.2 Screening of seedlings The unbalanced growth of rainbow trout is a common phenomenon. When the fry grows to 2g in weight, it needs to be screened once and kept in different pools in order to ensure the survival rate.
2.3 The average amount of water in the water and environment is 42L/s. By limiting the water depth from 23 to 35cm, the flow rate is increased by 1.38 to 4.70cm/s, and the exchange rate of pool water is increased by 2.03 to 4.79 times/h, so that the dissolved oxygen is maintained at 6mg/L or more. Ammonia nitrogen is maintained below 0.14 mg/L.
3, the daily management of fry and fingerlings
3.1 Guaranteeing smooth flow of water in seedlings The rainbow trout are highly oxygen-consuming fish, especially in the fry and fingerling cultivation period, the fish pond is small, the stocking density is high, the fish body is tender and weak, and the oxygen consumption is large. Under the conditions of captivity, dissolved oxygen in the water is above 9mg/L, and the appetite is prosperous and grows fastest.
3.2 Prevention of fry and fish species flight Rainbow trout fry and fingerling cultivation are carried out under flow culture conditions. Due to the small number of seedlings, the stocking densities are high, and the fry have the habit of escaping. For this reason, when rainbow trout fry and fingerlings are cultivated, in addition to doing a suitable barrage before stocking, they should also be diligently inspected for fish traps entering and exiting in routine management, discover problems and deal with them in time.
3.3 Timely sub-pool In the process of fry and fingerling breeding, with the prolongation of the breeding time, the fish and fingerlings will appear different sizes. Because rainbow trout is a meaty and ferocious fish, there are large fish to eat small fish habits, so in the daily management of seedlings according to the growing situation, timely feeding in order to improve the survival rate of fry and fingerlings and accelerate growth.
3.4 Frequent decontamination Rainbow trout live in fresh water, high oxygen content of water, with the growth of the breeding time, feed and fish waste discharge increased, although the flow of water can be washed away, but there is still a part of the accumulation Still water bottom. These leftovers and excreta not only pollute the water quality, consume oxygen, but also spread fish diseases, which are extremely unfavorable to the fry species cultivation and must be eliminated in time.
Rainbow Trout Seed Breeding Method
1. The newly hatched larvae of fish fry have a light body color, with yolk, weak physique, undeveloped development, lying on the bottom of the water, and continue to develop by absorbing the yolk nutrients. At this time, the larvae are afraid to see the glare. The water flow is weak, and the bottom of the light is dark. The lack of water can easily cause suffocation and death. For this reason, the bottom of the pool should be kept clean. It is better to lay a small layer of sand and increase the water flow appropriately. The water injection rate per 10,000 fish fry is maintained at around 10 L/min. The larvae pond is generally built indoors, with an area of ​​5 to 10 square meters and a stocking density of approximately 10,000 per square meter.