Astragalus breeding habits
Breeding season and environmental conditions: Astragalus reproduce only once a year and has a long spawning cycle. In the Yibin area of ​​Sichuan, the breeding of Astragalus is generally from May to August every year. In seasons, the period of reproduction is from June to July, and it fluctuates with the temperature, which can be delayed in advance. Before the breeding season arrives, kiss the first hole and call it For breeding holes, there are differences between breeding holes and residential holes: breeding holes are usually on the edge of a field, and openings usually open in the shelters of fields, and 2/3 of the lower edge of the hole is immersed in water. The breeding hole is divided into the front hole and the rear hole. The front hole spawns. The rear hole is slender. The hole is about 10 cm wide. The hole is about 5 cm above and below the left and right distance. About 10 cm. 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 Storks accounted for the majority, of which females accounted for 91.3% in February. In August, female baboons gradually decreased to 38.3%, and the male to female ratio was 0.6:1 because most females were born after August. After the eggs have been produced, the gonads gradually reversed, and males and females account for about 50% each from September to December. The breeding of Astragalus in nature is mostly a match between offspring and their parents, nor Excluding 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 females who first revert to males. , and then with the same batch of female quail breeding offspring, which is different from other fish in the Huanghua special place. Spawning and hatching: Sexually mature females have enlarged abdomens, orange-red (individually gray-yellow), and a red horizontal line. Before spawning, male and female parents Spits a bubble to build a nest, then lays eggs on top of the grass roots that fall off the top of the hole, and fertilized eggs and foam float in the hole. Fertilized egg yolk or orange, 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 it is powerful Being disturbed will not be far away, and the female deer will leave the breeding hole after the eggs have been laid (some scholars have observed that the female deer also participates in the protection of eggs and nurses). Dear The use of a bubble to estimate the nest has two functions. One is to make the fertilized egg difficult to be detected by an enemy, and the other is to make the fertilized egg tray float on the water, while the water surface is generally high in oxygen. High water temperature (the suitable water temperature for the hatching of eggs is 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) in water temperature, and the elderly reach 9 to 11 days, and requires stable water temperature. The fertility rate and hatching rate of Astragalus in nature are 95 to 100%. Embryonic development of Astragalus mongolicus differs from that of general freshwater fishes, especially those of carps, Features are: 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 tank are not Feeding can live for two months, 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 systematic evolution process of Huanghuan, it is explained that the ancestors of Huangpi were Pectoral fins, because of long-term adaptation to cave life, pectoral fins gradually degenerate and disappear.
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