Starting from summer to small full is the best time for fish spawning. At this time, the water temperature is appropriate, the broodstock matures well, the hatching rate and hatching rate are high, and the survival rate of the fish pond is also high. If we seize this favorable opportunity, we must strictly control the ostracism, drug use, and production management of broodstock, which is the key to successful production. 1. Choosing a mature broodstock to induce broodstock maturation or not determines the effect of oxytocin production. When selecting broodstock, maturity is generally identified based on its external characteristics. Mature mating females have enlarged abdomen, round abdomen, plump, soft and elastic. Grass carp and white plover touched the ribs with their fingers, and the genital hole was prominent and reddish. Immature female fish, the front abdomen is more rounded but the abdomen is thin and disappears, it is not soft enough, it has no elasticity, the genital hole is not prominent or slightly prominent, and it is not red. Over-ripened female fish are characterized by excessive expansion of the abdomen, elastic and non-elastic, like the appearance of a bulging gas, prominent genital holes, and hyperemia. Therefore, when selecting a broodstock, it is not possible to determine whether the broodstock is mature based solely on the size of the abdomen. When selecting a male and female fish, the abdomen should be turned upwards, and the sides of the abdomen should be lightly squeezed. The milky thick semen should flow out. It is better to disperse the water when it is in the water. The amount of semen is small or ribbon-like, and it cannot be quickly spread into unripe after entering the water. The thin, thin, yellowish oranges are too ripe. When oxysterone production, the proportion of male and female broodstock is 1:1.5, and their individual size is not too different. The selected broodstock should be numbered with pencils, ballpoint pens or smooth bamboo sticks at the top of their heads, loaded into the broodstock and weighed and recorded for drug injection. 2. There are many types of oxytocin-promoting agents that are used correctly. Commonly used are the pituitary gland, chorionic gonadotropin, the promotion of ovary analogs, and mixed hormones. The chemical composition of various drugs is different, the mechanism of action is not the same, so the fish species used for oxytocin production are not consistent. In general, the pituitary gland can be used for all kinds of fish, and ovulation hormones and their analogues are often used to induce grass carp and herring. Mixed hormones are mainly used for cultivating flower buds and white pods. Choriohormone is often used in combination with other drugs and has a good effect. It is not effective to produce grass carp alone. The dosage of drugs is usually determined by the injection dose per kilogram of female brood fish. The words, generally 4-6 milligrams of the pituitary gland, mixed hormone 1 unit, 800-1200 international units of chorionic gonadotropin, 20-80 micrograms of stimulatory ovulation hormone analogues. In the early stages of oxysterone production or when culling broodstock, high doses are used, and vice versa. The use of grass carp and white peony is less than that of herring and calyx. Males inject half of the female dose. The time and method of injection are generally pectoral fin injections, some of which are injections and some are two injections. An injection is usually in the afternoon and the egg is collected the next morning. The two injections are usually performed at about 10 o'clock in the morning, the first injection, the injection of 1/10 to 1/8 of the full dose; the second injection in the evening, the dose is 7/8 to 9/10 of the full dose, separated by two needles. 6-12 hours, when the female fish hit the second shot, all the medicine was injected into the fish once. 3, to strengthen the oxytocin management broodstock injection completed, into the spawning pool, there should be special care; prevent broodstock jump out; and pay attention to broodstock activity, make records. In addition, after the second shot, a flush of water should be made. Before the broodstock estrus, it should be flushed once more, about half an hour each time. The fish were stimulated with running water to enhance their spawning effect.
Fish Feed
Fish Feed,Fish Meal,Protein Feed of Fish Meal
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