The largest area of ​​the Heiniu Reservoir in the Chenxiangtun Township, Sujiatun District, Shenyang City is 500 mu. The annual aquaculture surface area is 300 mu. The average depth of 2.5 meters, the maximum depth of 5 meters. The source of the water is natural water, which is a typical small reservoir with aquaculture mainly in the eastern mountainous area of ​​Shenyang City, supplemented by flood control in the flood season. Before 1994, the output of fishery in the reservoir was about 15 kilograms per mu, and the output value per mu was only 75 yuan. The yield was low and the efficiency was poor. Since 1994, Black Bull Reservoir Regulators have been at the upper level of water
Under the guidance of the production technology promotion department, the pond aquaculture technology was introduced to the reservoir and semi-intensive farming was implemented. From 1995 to 1997, the average yield per mu was 85 kg and the per mu output value was 510 yuan. Increased production and increased efficiency. The main approach is as follows.
I. Renovation of reservoir conditions
1. The embankments, spillways and sluices should be carefully inspected every year for embankments. In the spring, we must repair the spillway well, dig wells for flood discharge, remove large plants and other obstacles within the spillway and at the outlet, and at the same time repair the sluice, which will facilitate the timely discharge of floods during the flood season. In doing so, the reservoir can withstand the catastrophic flood.
2. Set up anti-escape fishing rods to set up anti-escape fishing rods at the spillway and sluice gates and nets that meet the specifications for stocking fish species to prevent fish from fleeing during the flood season.
3. Qingye uses trapping nets to kill some ferocious fish in the reservoir to prevent predation of farmed fish of small specifications.
Second, fish species stocking
1. Cultivating large-scale species of fish to raise large-species fingerlings can increase the survival rate, enhance the ability to withstand predators, achieve commercial fish specifications in a short period of time, cultivate methods, and use reservoir-side fish ponds for large-scale fingerling cultivation every spring. Purchase fish fry and conduct intensive culture in the pond. By October, the tail pieces of eel and eel can reach 50 to 100 grams per end, and the eel and grass carp can reach 100 to 150 grams in autumn, realizing large-size fish species. Restocking.
2. Stocking densities range from 150 to 200 fish per acre of water, with squid as the main fish. There are a lot of plants around the reservoir, plus a lot of green grass in the mountains, which can be used with a certain amount of grass carp; the reservoir is rich in benthic organisms, but it can also be used with some bluefish: then with some big size carp. The general ratio is 80 to 100 per mu, and 40 to 60 per carp, 20 to 30 per carp, and 5 per carp.
3. The stocking time is divided into two periods of spring and fall each year, mainly in autumn, and the amount of fish in autumn is 70% of the total stocking. When conditional, round-rotor method can be used.
4. The surface area of ​​fish disinfection reservoirs is relatively large and it is difficult to treat fish diseases. Therefore, the fish should be disinfected before stocking to prevent the occurrence of diseases. Disinfection method, generally take 6 ~ 7ppm copper sulfate dip for 20 to 30 minutes or 1% baking soda, 3% salt mixture for 5 to 10 minutes.
Third, fertilization water quality
Fertilization can increase water body fatness, favor the proliferation of planktonic plants and animals, and provide more natural food for fish to achieve the effect of increasing production. At the same time, the application of a certain amount of distiller's grains to the water not only plays a role in fertilization, but also provides organic baits for fish, and it can also control fish parasitic diseases. The fertilization method starts fertilizing in early May every year. Stop fertilizing in mid-September. Fertilize 2 to 3 times a month, apply organic fertilizer 30-50 kilograms per acre and distillers grains 4-6 kilograms. When fertilization depends on the degree of thinness of the water, lean is more applied, and fertilizer is less or no. Fertilization should be uniform to increase fertilizer utilization. Fertilizers are mainly human and animal excreta.
Fourth, daily management
A special person was inspected around the reservoir daily to observe the changes in water quality, water level, and fish activity. Maintain moderate water quality and make the transparency about 30 cm to promote healthy growth of fish. Especially during the flood season, the water level of the reservoir rose, and attention was paid to the safety of spillways and sluice-fighting facilities in order to prevent fish from escaping. Fish growth was checked every 30 days. Find the sick fish and remove it in time.
Fifth, arrest
The species that are stocked in spring each year can be caught in autumn, and the species that are stocked in the fall can be caught in summer and autumn. After two years of stocking, they can be arrested all year round. In addition to catching fish by gill nets, fishing methods also purchased mesh foil and bottom trapping nets, which solved the problem of poor fish catching on the ground. To reach the net at any time to have fish at any time when the price is high and a large number of arrests. Capture large and small, can increase economic efficiency.
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