The hatching rate of fertilized eggs in Astragalus membranaceus is affected by various environmental factors, including water temperature, dissolved oxygen, and predator organisms.
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(1) Water temperature The relationship between embryonic development and water temperature is very close. Mainly in three aspects: First, the embryonic development must be carried out at a suitable temperature, too high or too low, will cause decreased hatching rate or embryo malformation. Studies have shown that the suitable water temperature for the embryonic development of Astragalus membranaceus is 21~28°C, and the optimal water temperature is 24~26°C. Second, in the range of suitable water temperature difference, too large or too fast water temperature difference can also cause embryonic malformation or death. It is required that the change in temperature within a short time should not exceed 3°C, preferably not exceed 1°C. Third, the length of embryonic development of Astragalus membranaceus is directly affected by the water temperature, and the water temperature is about 30°C (28-36°C). The embryonic development takes 5-7 days. At a water temperature of around 25°C, embryo development takes 9 to 11 days.
(2) Oxygen-dissolving jaundice embryos cannot use oxygen in the air. They can only use blood vessels to penetrate and absorb dissolved oxygen in water. Too low dissolved oxygen in water can cause developmental delay, stagnation, and even suffocation. Tests have shown that the hourly oxygen consumption of 100 Astragalus oocytes at a water temperature of 24°C is 0.29 mg for the cell division phase, 0.46 mg for the blastula stage, and 0.53 mg for the gastro-intestinal stage, which is much higher than the "Four Home Fishes". "Oxygen development in the embryo. Therefore, in the incubation process, the oxygen content of the incubation water should be close to or reach the saturation of dissolved oxygen in the water body.
(3) Fresh water quality Water quality plays an important role in improving hatchability. Never use pesticides or industrially contaminated water as incubator water. It is better to build a reservoir or arrange a pool to provide hatchery water, and filter before use to prevent The entry of predators and filth will affect the increase in hatching rate. The pH of water is preferably neutral.
(4) In the case of artificially-producing organisms, the larger enemy organisms are easily removed (such as cockroaches, small fish, small shrimps, etc.), but smaller-sized sword water scabs are easily overlooked. In fact, Sword leeches pose a greater threat to quail eggs and larvae. They can use an appendage to pierce the egg membrane or bite the larvae, thereby sucking quail eggs and pods as a nutrient. The victim's eggs or larvae soon die. The best way to prevent the blister mink is to filter the hatchery water and install the filter at the inlet.
