In order to expand the space for breeding in the breeding ground, I stationed a breeding pond that was idle in the winter and spring seasons and carried out rainbow trout farming experiments. The experiment was summarized as follows. Light Amber Halves Walnut Kernels
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First, market selection
The trial site was selected in the Dudouyang Farm, Qudou Village, Yuyang Township. The aquaculture water system is used for the reference of hawthorn water, with sufficient water sources, fresh water, and no pollution. The pH value is 6.5-7.5, dissolved oxygen is 7-8 mg/l, and the annual water temperature changes from 1 to 27°C, except for the high temperature period (5-8 In the month, the water temperature is below 24°C to 27°C. In the rest of the month, the water temperature is below 20°C. In this test, 150 square meters of cement pool was selected and a sun shed was placed over the pool.
Second, fish species stocking
The fish species were purchased from Sanming City and were used for oxygenation and cooling transportation. On October 10, 2005, 1700 tails and 65.8 kilograms were thrown at a time, and the average tail weight of the fingerlings was 38.7 grams. Stocking density is 14/m3. 5 to 7 days before the release of the fish species, the test pool was disinfected with potassium permanganate, and water was stored for 50 cm until the seedlings were released. Disinfect the fish species before entering the pool.
Third, daily management
1. In the early stage of feeding, the large yellow croaker juvenile No. 2 buoyant expansible material has a feed particle size of 0.3 mm and a protein content of more than 45%. In the middle and later stages, ordinary marine fish floating expansible feed is used. The feed diameter is 0.8 mm and protein content 43% or more. It is fed twice a day from 7:00 am to 8:00 pm and from 17:00 to 18:00 pm; the daily feeding amount is 2.5% to 3% of the total fish body weight and 1% to 2.5% in the medium term. The latter period is 0.6% to 1%.
2. During the cultivation period, the test pool is kept flushed for 24 hours. The exchange rate of the pool water is 4% to 5% per hour, and the water level is controlled at 50 to 80 cm. A 0.75-kilowatt waterwheel type aerator was installed in the test pool, and oxygen was turned on for 24 hours during the breeding period. After feeding every morning, about 1 hour later, most of the pool fish will discharge the first excrement, and at this point the cleaning can begin. When clearing the dirt, use a long-handled wide plastic brush to wash the bottom of the pool from the edge of the pool to the center of the pool in turn, and lower the water level to increase the flow rate when cleaning. Adhere to the morning, mid-night and evening patrols. Observe the rainbow trout activity carefully. Measure the water temperature twice a day and find that the problem is solved in time.
3. Disease prevention and control In this breeding experiment, the main diseases were small echinococcosis, trichoderma, enteritis, hydromycosis, etc. In addition, due to the opening of the aerator, the individual fish died due to mechanical damage.
(1) Squash Ichthyosis: 1 per metre of water, 0.5 kilograms of dry chili, 1 kilogram of ginger (chopped dried pepper, smashed ginger), mixed with water and sprinkled with water, once a day, for 20 minutes. For 3 consecutive days. 2 1 meter per mu water depth 1 kg rhubarb, 1 kg dry chrysanthemum products, mixed with Jianshui water Quanchiposa once a day, for 3 days. 30.7 g/m3 copper sulfate Quanchiposa, 6 ~ 8 hours after a thorough cleaning and changing water, 3 to 4 days after repeated.
(2) Trichodiasis: 1 Use 0.7 g/m3 copper sulfate Quanchiposa, 6 to 8 hours after the complete pollution water, 3 to 4 days after repeated. 2 Drainage 2/3, Hundred insects kill 0.5 mg/L + Insecticide 1 mg/L Still water dip, pay attention to observe the situation, fill the water after 1 hour, change the water after 12 hours.
(3) enteritis disease: 1 per kilogram of feed added to enteritis (main ingredient is sulfadiazine) 5 grams, mix and feed, 2 times a day for 3 days. 2 Add 2 to 3 grams of berberine per kilogram of feed, 2 times a day for 3 consecutive days.
(4) Saprolegniasis: 10.08 Torr of salt and baking soda (1:1) solution is splashed in the whole pond and soaked in still water for 6 hours once a day for 2 consecutive days. 22 to 4 g/m3 Miya Methyl Blue Quanchiposa, soaked in still water for 6 hours, repeated every other day.
Fourth, the test results
This project was accepted on April 20th, 2006. The test lasted for 192 days. A total of 1,132 rainbow trout and 1030.1 kg were harvested. The average tail weight was 910 g. The average body length was 39.4 cm. The maximum individual tail weight was 1021 g, and the body length was 43.6 cm. The survival rate was 66.6%, the shared feed was 1133 kg, and the feed coefficient was 1.1. The total output value was 30,903 yuan, and the breeding cost was 19,576 yuan (including 4545 yuan for fish, 6798 yuan for feed, 300 yuan for fish and fishery, 4,200 yuan for wages, 1,000 yuan for pool rent, 1,728 yuan for electricity, and 1,000 yuan for other), and the profit was 11,327 yuan.
V. Discussion and Summary
1. Tests have shown that the breeding season in the southern region can be used for rainbow trout farming in late fall, winter, and spring, depending on the season. From the end of September, large-scale fish species with a tail weight of 30 grams or more will be bred. The breeding density will generally be controlled between 15 and 20/m3, and raised until the end of April of the following year. Generally, the tail weight can reach 1 kilogram before the advent of the hot season. You can go out to market.
2. Cultured rainbow trout needs clean and lean water, but this kind of water is prone to parasitic diseases. In this experiment, small melon worms occurred in the middle and late October, and trichodiasis occurred in mid-April. The occurrence of small melon worms was not timely due to treatment, resulting in greater losses. Parasites were the most serious diseases in this experiment. 487 of them died of parasitic diseases, accounting for 85.7% of the total deaths. Among them, 463 of them died from echinococcosis, accounting for 81% of the total deaths. In the winter, we should focus on the prevention of echinococcosis, and we should focus on the prevention of trichoderma in the spring.