The Breeding and Rational Development of Chinese Blackbird
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1 Breeding
1.1 Morphological features and habits Ukrainian body is blackish-black, gradually decreasing in color from the back to the abdomen; the body is nearly cylindrical, the head is large, the mouth is large, the back and hip joints are long, the pelvic fins are abdomen, and the tail wax is round. Swimming in the water is more rapid and one hundred lives in fresh water with many muddy plants. It blazed up and down with sharp teeth, often lurking in the bottom of the water or dense grass, waiting for the opportunity to catch small fish. The stomach and intestine are clearly distinguishable in the body. The intestine is shorter than the herbivorous fish and is 1/3 of the body length. In addition to breathing in the water, you can also pleated and breathe air. In the warm season, after standing in the water for a period of time, Ukrainian often needs to head out of the water and use pleated breathing air to make up for the lack of breath in the water. After experienced fishermen catch live fish, they always expose a portion of the nets of the prisoner fish to the surface of the water, making it easier for the dragonfly to breathe to prevent sudden death. During the hibernation period, people get muddy, do not feed, and rely on the fat accumulated in the body to maintain their life activities.
1.2 Breeding behavior The breeding season of Chinese hawkthorn is from early May to early August and the breeding season is June. The nest site is selected in areas where the water quality is clear, calm, with emergent plants or floating plants, the depth of which varies depending on the size of the fish. Before spawning, the broodstock pair activities in the nest, inseparable, chasing play or drive away nesting fish. During the breeding period, females and males are of different shapes. Males appear darker, and large stripes appear on both sides of the female body. After the broodstock spawns and ejaculates, it is strictly guarded beside the nest. If the egg pieces are scattered, the eggs will be gathered together with the fins, and the juvenile fish that hatched will be guarded until they can swim. The broodstock encounters predators during this period. That is, fighting. Due to the young child's behavior of keeping young children, the survival rate of offspring is greatly improved.
1.3 Changes in juveniles Freshly-produced eggs are golden in color, concentrically and contiguously floating on the plants, and the colours are close to the plants after 1 day. The eggs hatch in 2-3 days. The larvae that have just hatched resemble quails. They are active on the water and cannot control the direction of swimming. After 4-5 days, the pale green body of the larvae turns black, a pair of bright eyes are visible to the naked eye, and the range of activities is expanded. Not only can they be active on the water, but they can also swim in the water for a short time. The juveniles were very clustered and soon swam together after being dispelled. After 1 week, they started their stray life. During the growth of juveniles, the body color will change again, from black to bronze, with the appearance of adult fish.
2 The rational development of Nansi Lake is located in the southwest of the mountain. It is the general name of Weishan Lake, Zhaoyang Lake, Dushan Lake and Nanyang Lake. The whole lake covers an area of ​​1266km2. It is the largest lake in Shandong Province and one of the largest freshwater lakes in China. With abundant animal resources, it is an important freshwater fishery base in Shandong Province. The rise in bale production mainly depends on artificially fed domestic fish, while the production of wild black locust decreases year by year. The market fish are single. The reasons for this phenomenon are the following:
2.1 As a large amount of industrial and civil wastewater is directly discharged into the waters of lake areas, the lake water is seriously polluted and is in a state of eutrophication, and the aquatic biota changes due to changes in the water quality conditions, resulting in a decrease in wild black earthworms due to deterioration of the living environment.
2.2 Oviposition spawning is concentrated and easy to see. The broodstock has behaviors of guarding against eggs and tending to be young. It is easy to hook fishing. Once the broodfish are caught, the loss of eggs will be large and the breeding will be affected.
2.3 In recent years, many unscrupulous elements have taken specialized electric boats or holding electric devices to catch large lakes regardless of season or season, swimming in the water and even falling into the mud and hibernating doves. They have been shocked regardless of size.
2.4 Juvenile fish movements, positioning network like the underwater maze, juvenile fish strayed into the net.
The greatest harm to the survival of Ukrainian dragonfly comes from the economic activities of human beings. Because the market price is good, it has a strong temptation. Therefore, predatory development is carried out, and resources are gradually depleted. In order to rationally utilize and develop the wild aquatic resources of Wuji, the following suggestions are proposed: 1 Extensive, in-depth publicity of relevant laws and regulations, strict enforcement of laws, strengthening of lake management, and rational development of resources; 2 Prohibition of fishing and fishing during breeding period, prohibiting the use of each Kinds of electric fish catching equipment electric fish; 3 shut down the township and township enterprises with serious pollution on the coast of the lake area, strengthen the treatment of domestic sewage, purify areas that have been heavily polluted as soon as possible; 4 set up a ban lake area for the smooth reproduction of various wild color energy; 5 establish Special pond for artificial breeding, increase economic efficiency.