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I. Effective ways to control the number of "three types of seedlings"
1, choose high quality seed.
2, the use of scientific breeding culture technology. When domesticating the slurry in the incubation stage of white seedlings, the first two feedings should have sufficient feeding amount, so that each seedling has the opportunity to feed on the feed, so that it is better to feed more. Because red worms (silkworms) tend to form lumps in the water, making it difficult for weak seedlings to ingest or fear food, they must be slow and gradually splashed when the mash is poured. The general splash time is about 30-40 minutes. The diluted red worm slurry can be sprinkled in a short time. At the same time, according to the distribution position and activity characteristics of the seedlings in the cultivation pool, the spatter range can be flexibly controlled, so that some of the weak seedlings that are not good at swimming can also feed on the feed to facilitate the recovery of the seedling constitution. Widen the gap between growth and healthy seedlings. In terms of splattering operations, it is necessary to grasp certain skills and try to make red worm slurry particles suspended in water so as to adapt to the feeding habits of squid. Practice has proved that the domestication stage of the slurry is one of the key links for effective control of the number of “three types of seedlingsâ€.
During the cultivation of white seedlings, the time and position of the feedstuff ascending can be determined according to the strength of the ingestion ability of the clams, and do not rush to upgrade the feedstuffs in a short time. For white seedlings with uneven growth or low food intake rate, the bottom of the pond can be fed with red worms until the feed conversion is about to take place, and the feed table is gradually raised several days before the feed conversion, so that the seedlings can relatively evenly feed and prevent the weak. The seedlings were unable to feed on the platform due to the increase of the feed table, so as to effectively reduce the number of “three types of seedlings†produced.
Second, the "three types of seedlings" breeding measures
1, first prepare a large area of ​​intensive intensive or earthen ponds, clear pond disinfection, in the first month before the "three types of seedlings" into the pool, add fresh water, water purification by conventional methods, so that the pool water is rich in phytoplankton and A moderate amount of zooplankton, to create a good ecological environment, to maintain the stability of the water quality of physical and chemical factors, in order to facilitate the "three types of seedlings" to eat part of the natural biological feed, and promote the function of its internal organs to restore and increase the desire to eat.
2. The newly-selected "three types of seedlings" should be raised separately in one pond, and the stocking density should be reduced as much as possible, but not too low, otherwise it will affect the "three types of seedlings" desire for food and the ecology of the water environment. balance. At the same time, do not put the “three types of seedlings†into the cultivation ponds of seedlings or healthy seedlings of the same specifications because the seedlings in the original cultivation tanks have adapted to the growing environment, and the newly introduced “three types of seedlings†cannot immediately Adaptation, despite individual differences, lacks the ability to compete for food.
3. Appropriately raising the temperature of cultured water can increase the activity of enzymes in the seedlings, promote biochemical reactions and increase the level of metabolism. Especially during the seedling period, the effects of raising the water temperature were more pronounced.
4. To cultivate "three types of seedlings" in intensive cultivation pools, and to regularly select large and small children. Because the "three types of seedlings" breed after a certain period of time will inevitably appear between the size of the individual differences, some of which grow faster than the other individuals, and compete for food ability, select this part can be incorporated into the same specification of the "three Seedlings" breed in ponds.
Controlling the number of three types of seedlings in aquaculture
鳗鲡 "Three kinds of seedlings" is also known as eucalyptus, settled seedlings or appendix, mainly refers to some slow-growing or individual thin and difficult to grow squid, generally weighing only a few grams or so. In the process of carp breeding, the number of "three types of seedlings" directly affects the aquaculture cost, commodity rate, yield, and economic benefits of carp. In the current situation where bargain prices are generally low, the number of "three types of seedlings" is effectively controlled. It is particularly important.