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Wheat ear fish reproduction
There is little difference in body shape between male and female fish at ordinary times, but there is obvious difference between male and female fish in breeding season. The male fish is dark in color, and keratinocytes appear in the snout, mandible and the bottom of gill cover. Female small color is shallow, with black longitudinal stripes on the side. The breeding peak of the ear fish is from April to June, when it can reach sexual maturity. The identification results of 60 fish showed that there were 32 females and 28 males, and the sex ratio was1.14-L. During the research, we found that there are eggs at different developmental stages in the same ovary. Therefore, it can be inferred that the wheat ear fish is a kind of fish that lays eggs in batches. As soon as the egg comes into contact with water, it becomes sticky, absorbs water and expands, and adheres to aquatic plants, branches, tree roots on the shore or suspended substances on the water surface by virtue of the viscosity of the egg membrane. The fertilized egg is colorless and transparent; Unfertilized eggs are milky white and melt and disintegrate quickly. Male fish have egg protection behavior during breeding period. The male fish guards the eggs until the fry break out of the membrane and can swim freely to eat. The tail of the newly hatched larvae comes out of the membrane first, often attached to the original place, swimming intermittently and starting to eat. The time from hatching to horizontal swimming is about 48 h. Rainfall, running water and sultry climate during the breeding period can induce wheat ear fish to lay eggs. Under natural conditions, the wheat ear fish likes flowing water, especially in shallow water with certain turbidity and dense aquatic plants. The time of embryo development is directly proportional to the water temperature. According to Zhang et al. ∞ 1' s research on population biology and population dynamics of Ophiopogon japonicus in Baoan Lake, the mortality rate of 1994 generation rose sharply in the late reproductive stage of 1996, and all of them died after spawning period.