parents Learn more about parents
-
Technical measures to reduce the death of spawning parent fish
Reducing the death of spawning parent fish is an important technical work in fish fry culture. There are two main factors causing the death of parent fish in spawning. One is that parent fish consume a lot of physical energy in the process of spawning and reproduction, which increases the side effects of spawning drugs and reduces the resistance of parent fish. If the fish is seriously injured, various pathogens will take advantage of the opportunity to infect the fish and cause disease, resulting in the death of the parent fish. Second, the physique of the parent fish is poor, or the water temperature changes greatly during the induction of labor, and the improper dose of the drug (the dose is too high or too low), the parent fish can not give birth normally.
2019-01-16 -
Key Techniques for Reducing the Casualties of Parental Fish
The main factors leading to the death and injury of spawning parent fish are as follows: one is that the parent fish consumes a lot of physical energy in the process of spawning and reproduction, and the side effects of spawning drugs make the resistance ability of the parent fish decrease. If the fish body is injured, the pathogen infection is easy to cause diseases; the other is that the parent fish is poor in constitution, or the water temperature changes greatly during spawning, and the dosage of spawning drugs is improper. The parent fish cannot spawn normally, and thus causes its own physiological activity disorder and death. Therefore, in production, it is necessary to effectively grasp the prenatal cultivation of parent fish, so that the gonad development of parent fish is normal.
2019-01-16 -
Don't forget to protect the parent fish in order to induce labor.
Reducing the death of spawning parent fish is an important technical work for fish fry producers. In the production practice, we found that there are two reasons for the death of parent fish: first, the physical exertion of parent fish in the process of spawning and reproduction, coupled with the side effects of spawning drugs, reduce the resistance of parent fish, if the fish is seriously injured, a variety of pathogens will take advantage of the opportunity to infect the fish and cause disease, resulting in the death of the parent fish. Second, the physique of the parent fish is poor, the gonadal development is poor, or the water temperature changes greatly during the induction of labor, and the dosage of drugs used to induce labor is inappropriate.
2019-01-16 -
Parent cultivation and propagation techniques of cultured tilapia
The reproduction of tilapia does not need artificial aphrodisiac and running water stimulation, as long as the water temperature is more than 20 ℃, mature male and female parent fish can reproduce naturally in the same breeding pond. When the water temperature is stable at 25-29 ℃, it can reproduce every 30-50 days.
2020-11-08 Culture tilapia parents breeding and reproduction technology -
The three hurdles of parent fish in summer
The Beginning of Summer to Lesser Fullness of Grain is the best time for parent fish to induce spawning. at this time, the water temperature is suitable, the spawning rate and hatching rate of parent fish are high, and the survival rate of fry is also high after entering the pond. If we seize this favorable opportunity and strictly control the selection of parent fish, the use of drugs and the management of induced labor, the success of induced labor can be achieved. Whether the mature parent fish is mature or not determines the effect of spawning. When selecting parent fish, its maturity is generally identified according to its external characteristics. The belly of mature female parent fish is swollen, round, soft and elastic.
2019-01-15 -
Intensive cultivation techniques of parent fish during transformation period
After the beginning of spring, the gonadal development of parent fish gradually transformed with the increase of water temperature. Especially before giving birth from the beginning of spring to the middle of May, the gonadal transformation of parent fish is very fast, and the ovary coefficient can reach 15% to 20%. During this period, strengthening the cultivation and management of parent fish during the transformation period can promote smooth spawning; on the contrary, gonadal development will stagnate or even degenerate. The intensive cultivation techniques of parent fish during the transformation period are as follows. First, divide the pool at the right time. In order to grasp the growth and development of parent fish and facilitate the arrangement of spawning and reproduction, the parent fish should be divided into ponds when the water temperature is 10 ℃. Disinfect the small pond before dividing the pond
2019-01-15 -
The Source and selection experience of Freshwater White Pomfret parent Fish in Culture
The freshwater white Pomfret has a strong reproductive ability, and the parent fish should choose individuals with large size, fast growth, no disease or injury, smooth body surface and distinct color as the parent fish. Moreover, it is necessary to avoid fish that are close to green as parents, so as not to degenerate and affect the growth of offspring.
2020-11-08 Aquaculture freshwater white Pomfret parent fish source and selection experience -
Key points of cultivation techniques of parent fish in winter
The cultivation of parent fish can be divided into postpartum nursing, autumn cultivation, winter cultivation and spring cultivation. Due to the low temperature in winter, the activities of parent fish are reduced, the feeding ability is weak, and fish diseases are easy to occur. If it is poorly managed, it will have a great impact on artificial hatching, fry production, adult fish culture and other production links in the coming year. The main technical points for the cultivation of parent fish in winter are as follows: first, the selection of parent fish pond requires sufficient water source, flat bottom, shelter from the wind and sun, water conservation and heat preservation, with an area of 10-15 mu.
2019-01-16 -
Source and selection of parent fish of Pelteobagrus fulvidraco
Parent fish for artificial reproduction can be fished and selected directly from rivers, lakes, reservoirs, ponds and other water bodies. This is a common method for artificial reproduction of Pelteobagrus fulvidraco in culture units at present. If there are conditions, you can cultivate your own Pelteobagrus fulvidraco parent fish. And choose from it. When fishing for parent fish from rivers, lakes, ponds, reservoirs or ponds, we should pay attention to the following: specific requirements: ① should be determined to catch parent fish in autumn and winter, when the water temperature is low, which is conducive to selection and operation, and is especially easy to transport.
2019-01-16 -
Key points of cultivation techniques of parent fish in winter
The cultivation of parent fish can be divided into postpartum nursing, autumn cultivation, winter cultivation and spring cultivation. Due to the low temperature in winter, the activities of parent fish are reduced, the feeding ability is weak, and fish diseases are easy to occur. If it is poorly managed, it will have a great impact on artificial hatching, fry production, adult fish culture and other production links in the coming year. The main technical points for the cultivation of parent fish in winter are as follows: first, the selection of parent fish pond requires sufficient water source, flat bottom, shelter from the wind and sun, water conservation and heat preservation, with an area of 10 Mel and 15 mu. two
2019-01-11 -
Parent fish cultivation techniques of four major domestic fish in spring
Spring is an important period for gonadal maturation of parent fish. From the beginning of spring to spawning, a large amount of nutrients in parent fish are transferred to gonadal development, so the cultivation of parent fish should be strengthened in spring to meet the needs of gonadal development and promote timely maturation and smooth spawning. The cultivation techniques are as follows: 1. Divide the pond ahead of time. Adjusting stocking density and breed matching is the first condition to cultivate good parent fish. The area of the pond separated by the parent fish should be 2000 square meters and 2600 square meters. Drain the pond water before dividing the pond to remove wild miscellaneous fish, clams and enemy pests, and at the same time remove some of the pollution.
2019-01-11 -
Accompany the child to do his homework, the mother is out of control and the father drinks pesticides: the child's education problem is so difficult?
2017-12-03 indescribable generous reading, generous lifestyle "the road of parenting, there is a long way to go." Good morning! " The other day, on Weibo.
2019-02-26 -
Do you still need to support your parents-in-law as a son-in-law? The parents-in-law gave both houses to their brother-in-law.
Do you still need to support your parents-in-law as a son-in-law? Parents-in-law two houses are given to brother-in-law abstract: there are many parents' houses around me, my parents are also the same house is for their son. (we are also demolition households) the married daughter doesn't have any.
2018-08-01 -
Strengthening the management techniques of parent fish cultivation and aquaculture in winter
Strengthening the management techniques of parent fish cultivation and aquaculture in winter
2018-07-14 -
Tea cross breeding
The variation of hybrid population was produced by sexual hybridization of tea parents with different genetic characteristics, and then selected to cultivate a new tea variety breeding method. The selection of hybrid parents is related to the success or failure of cross breeding and the level of cross breeding. The general principles are: the parental traits of ① can learn from each other, and the good characters should be outstanding; the adaptability of ② parents to local environmental conditions, especially the materials selected as female parents should have strong adaptability; the flowering period of ③ parents should be consistent, and the knot of female parents should be more consistent.
2019-01-16 -
Seedling production of barracuda
The seedling production of mullet includes two steps: artificial propagation and seedling breeding. The former is divided into parent fish cultivation, induced spawning (artificially induced ovulation), artificial insemination, artificial hatching and other processes, while the latter is divided into two processes: fry cultivation and fingerling cultivation. In the study of artificial reproduction of grey mullet, the first artificial spawning of grey mullet was completed in Italy as early as 1930. It was not until the past 10 or 20 years that it attracted the attention of relevant countries in the world, and became an important topic in international biological research. China, the United States, India, the former
2019-01-16 -
Breeding techniques of parent fish in silverfish culture
1. The source of parent fish. Sexually mature individuals caught in the breeding season can be used for artificial reproduction; sexually mature individuals can be used for artificial reproduction; individuals that are not sexually mature shall not be used for artificial reproduction. two。 The fishing of parent fish. The fishing of large silverfish should be carried out during the peak spawning period. fishing can be started in the north of the Yellow River in early December and in the south of the Yellow River from mid-December. Fishing gear can be Gill net (mesh 2a is 1.5-2.4 cm) or ice
2019-01-16 -
"parent-child tour" travel guide
"parent-child tour" travel guide
2019-02-20 -
Why do parents in rural areas pay less and less attention to their children's education?
Why do parents in rural areas pay less and less attention to their children's education?
2019-02-20 -
8 key points of safe overwintering of parent shrimp with good breeding benefit and high reproductive benefit
8 key points of safe overwintering of parent shrimp with good breeding benefit and high reproductive benefit
2019-01-16