Sex ratio and spouse composition: According to the annual anatomical jaundice in Sichuan, the reproductive population of Astragalus was more female than male during the entire reproductive period. Before July, females accounted for the majority, of which females accounted for 91.3% in February. In August, females gradually decreased to 38.3%, and the ratio of males to females was 0.6:1. Since most females developed eggs after August, the gonads gradually reversed. 9 From December to December, males and females account for about 50% each. The breeding of Astragalus in nature is mostly a match between offspring and their parents, and does not exclude the possibility of pairing with the previous two generations of males, but in the absence of realgar, there will be a small number of females in the same batch of Astragalus. After the first reversal to the male cricket, the larvae were then reared with the same batch of female crickets. This is a special feature of the cricket that is different from other fish.
Spawning and hatching: Sexually mature females have enlarged abdomens, orange-red (individually gray-yellow), and a red horizontal line. Before spawning, the male and female parents spit bubbles to build a nest, and then lay eggs on top of the grass roots that fall off the top of the hole. The fertilized eggs and foam float in the cave. Fertilized yolk or orange yellow, translucent, egg diameter (after water absorption) is generally 2 to 4 mm. Male parents have a habit of protecting eggs, and they usually guard until the yolk sac of the seedling disappears. At this time, even if the male dragonfly is disturbed, it will not be far away, and the female relatives will leave the breeding hole after they have laid eggs (some scholars have observed that the female dragonfly also participates in egg protection and nursery protection). It is estimated that there are two roles for the parent to spit the bubble, one is to make the fertilized egg difficult to be detected by the enemy, the other is to make the fertilized egg tray float on the water, and the water surface is generally high in dissolved oxygen and high in water temperature (the appropriate water temperature for hatching eggs 21 ~ 28 °C), which will help improve the hatching rate.
From the fertilization to the hatching of Astragalus erinaceus, it usually takes 5 to 7 days at 30°C (28 to 38°C) for water temperature and 9 to 11 days for the elderly. It requires water temperature stability and the fertility and hatchability of Astragalus membranaceus in nature. It is 95 to 100%. The embryonic development of Astragalus membranaceus differs from that of general freshwater fishes, and is particularly different from that of carps. Its characteristics are as follows:
1. Large egg size, many yolks, long embryonic development time, large larvae when filming out, strong tolerance to the environment. The larvae in the indoor glass tanks live for two months without feeding, but the fish is extremely thin.
2. The same batch of eggs produced by the same pro-family were hatched under the same conditions, and the larval fish filming time was also inconsistent, with a difference of about 48 hours.
3, neural plate appeared in the early gastro-intestinal animal pole cells packaged to 1/3 to 1/2 of the egg, similar to the carp and distinctly different from carp.
4, pectoral fins formed in the embryonic stage and continue to fan out after the film gradually disappeared. Seen from the evolutionary process of Huanghua, the ancestors of Huangpi were described as having pectoral fins. Due to long-term adaptation to burrowing, the pectoral fins gradually deteriorated and disappeared.
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