Growth habits of silver carp
1. Silver carp is an pelagic fish. In spring, summer and autumn, they spend most of their time swimming in the upper and middle waters for food, and in winter they dive into deep water for wintering.
2. It is a typical filter-feeding fish. Main food: Silver carp feeds on plankton all its life, mainly in the fry stage, and gradually changes to eat phytoplankton when it grows to more than 1.5 cm, and likes to eat grass carp feces, chicken and cow dung. I am interested in sour food and like bad food. The bait of silver carp has obvious seasonality. In spring and autumn, in addition to plankton, they also eat a lot of saprophytic bait; The lower the water level in summer, the greater the food intake; Eat less and exercise less in winter. Suitable for aquaculture in rich water. The length of the intestine is about 6- 10 times of the body length.
3. Appetite is directly proportional to water temperature. Silver carp likes high temperature, and the optimum water temperature is 23℃~32℃. In hot summer, silver carp has the greatest appetite.
4. Lively temperament, like jumping, have the habit of going upstream, but the movements are not very agile and clumsy. Silver carp likes fat water, and people with similar individuals often swim in groups to the middle and upper reaches of the water, especially in Mingshui areas with rich water quality.
5. Timid, afraid of being disturbed. When disturbed or touching the network cable, they will jump out of the water and escape through the network.
6. Fast growth and high yield. The sexual maturity age of silver carp is 1-2 years earlier than that of grass carp. Mature individuals are also very small, generally more than 3 kilograms of female fish can reach maturity. The relative fecundity of a 5 kg female fish is about 40,000-50,000 eggs /kg body weight. She lays eggs in April-May every year, and the absolute fecundity is 200,000-250,000 eggs. Floatability of eggs. The spawning period is similar to that of grass carp. Under the condition of pond culture, if the bait is sufficient, it can grow to 500-800 grams in the same year, the weight of the third-instar fish can reach 3-4 kilograms, and it can reach 30-40 kilograms in natural rivers.
7. Poor hypoxia tolerance. If there is no oxygen in the water, the head will float immediately, and some will die soon.
Feeding method of silver carp
Pond selection:
Silver carp
Silver carp is a kind of fish culture, and it is in a subordinate position in the ponds where carp, crucian carp, grass carp and bream are mainly raised. The pond selection is completely consistent with the main fish culture types applied for certification above.
Water quality requirements:
The water quality requirements of silver carp are completely consistent with those of the main carp that has applied for certification.
Seed requirements:
Before stocking, fry must go through inspection and quarantine, and select the ones with pure quality, health and good specifications. The stocking time is in the middle and late May.
Pond culture:
1. Fish feeding
Fish fry stocking: In the middle and late May, when the water temperature in the pond is stable above 18℃, it is the suitable time for stocking. Put silver carp and mullet at a density of 3-5 strips per square meter. Feeding management: After the fry enter the pond, they mainly feed on zooplankton and crumbs.
Adult fish culture: specification and density of fish species. The specification of overwintering fish species is100-200g/fish, and the stocking density is 0.4-0.5 fish/㎡.
Silver carp is a kind of fish culture, which is based on the time when carp leave the pond.
2. Overwintering management
Overwintering density: The overwintering density of adult fish and fingerlings in pressure tanks is generally 0.3-0.6㎏/㎡. Can be adjusted according to the situation of the pond.
Requirements for overwintering fish: the fish should be free from disease and injury, fat and strong.
Overwintering method: The overwintering pool should be relatively clean, with good water retention, and the water depth under ice should be kept at about 1.5m, and ponds should be merged according to different specifications: before freezing, the whole pool should be sprayed with 90% crystal trichlorfon 1.5-3.0kg/ ha, and the phytoplankton quantity should be kept at 25-50 mg/L. In order to keep the water surface transparent, it should be timely.
Pest control of silver carp
1. Care should be taken during the hauling, screening and transportation of fry and fingerlings to prevent fish from being injured.
2. Fish fry and fingerlings enter Tang Qian and are soaked in 2.0% saline for 5- 10 minute for disinfection;
3. In high temperature season, the food market is disinfected by hanging bags with bleaching powder or a mixture of copper sulfate and ferrous sulfate every month.
4. Regularly use microbial agents to adjust water quality and improve fish immunity; 5. The dead fish should be fished out in time and buried deeply.
6. Fish disease treatment.
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