鳗鲡 Healthy breeding

鳗鲡 Healthy breeding

Choosing suitable water sources and water quality Currently, the water sources used in the trout farms in Guangdong Province are: river water, reservoir water, mountain stream water, groundwater, and surface seepage water. The mountain streams, groundwater, and surface permeated water have clean water and few contagious pathogens, especially groundwater and surface permeated water. The cleanliness of the water source, fewer pathogens, water temperature, and physical and chemical indicators are relatively constant. Suitable for water temperature range, it is very beneficial to the rapid growth of carp all year round, and greatly reduce the adverse effects of summer high temperature and energy costs and resources of the winter heating and a lot of waste. However, the groundwater pH is generally lower than 7, and the total ammonia nitrogen content is high, and the dissolved oxygen is low. It is necessary to perform aeration and air treatment before use. The river water and reservoir water bodies are more complex. Before entering the water, the water source must be filtered. After entering the water, the water should be promptly disinfected. It is advisable to have a reservoir in a large conditional pool. The water quality of the reservoir should be up to the standard. The indicator (see the attached table) is used after; the Japanese eel has a slightly different requirement for water quality than the euphorbia. Japan eel can be suitable for breeding in a higher water temperature environment, but the winter eel culture effect is not as good as eel eel; Not sensitive, suitable for light culture.

High quality feed

The quail is a group of feeding animals. The environmental factors affecting the normal feeding of earthworms are very complex. The ability to provide balanced nutrition and the physical properties (such as stickiness and elasticity) of the feed in the water will affect the utilization efficiency of the feed and carp. The growth rate, which indirectly affects the quality of water changes. The full-price artificial compound feed and puffed floating feed currently used in large quantities in production are based on the nutritional requirements of different stages of growth of carp, and are prepared using a variety of raw materials such as fishmeal, vitamins, and minerals. On the basis of raw material testing, it is formulated according to the physiological needs of earthworms. Reasonable raw material preparation and the clever use of additives such as seaweed extract, molasses yeast powder, and winterized cod liver oil can not only make up for the lack of nutrients in various raw materials. It counteracts the mutual antagonistic effects of certain nutrients and balances the amino acids so as to increase the absorption and utilization of feed. Add alpha-starch, polyviscosity, and hydrolyzed gluten to increase feed water stability (viscoelasticity) to reduce feed loss and maintain relatively stable water quality. At the same time with the use of fast bait net, liver and diuretic and other liver protection additives are considered perfect formula. Artificially prepared high-quality full-price feeds should have the following characteristics: raw material sources are fresh and stable, flavor and mouthfeel are good, digestibility is good, and there are no other undesirable factors.

Appropriate feeding amount

The level of daily feeding of carp is closely related to various factors such as the growth stage, health status, water quality conditions, dissolved oxygen, feed quality, climate, environmental changes, and disease factors. It is one of the key technical measures for aquaculture to succeed in grasping the appropriate daily feeding amount. The feeding control is controlled at a level of 8 full, and it is steadily added in an appropriate amount according to the nutritional level of the feed and the daily weight gain to prevent overfeeding. .鳗鲡 In the white and black cubs phase, the food intake is more vigorous, and the daily feeding amount increases rapidly. At this time, attention should be paid to the increasing rate of feeding, which is generally controlled at about 5%. The increase or decrease of the feeding amount can be based on the time of feeding. Length, how much the number of fences after eating, fluctuations in temperature and water temperature, as well as the density and health status of quail; In summer, with the increase of individuals and the increase of water temperature, the increase in food consumption in Europe. Slow down, the amount of bait should be controlled at 2% -3%; into the fall, the growth rate of European eels will slow down, physiological demand will drop, the amount of bait should be stabilized between 1.5% - 2.0%; in the winter, the eel will enter During the flood season, at the same time, the temperature of the water decreases, and the cockroach's digestive function weakens. At this time, the amount of water to be fed should be controlled between 0.8% and 1.5% depending on the water temperature and climate variations in different places; when the water temperature is below 12°C , you can consider feeding a meal every day. The feed intake, growth rate, and digestive function of Japanese cockroaches are significantly better than those of European cockroaches. However, in the fall and winter seasons, the water temperature in most culture areas can be reduced below the normal intake temperature of Japanese cockroaches, while the ecosystem in the water body is highly variable. For example, the slow growth of algae and the change of microbial species can affect the metabolism of ammonia nitrogen in water and then affect the feeding level and digestive ability of Japanese alfalfa. Therefore, one-sided pursuit of growth rate, blindly increasing the amount of feeding, can easily cause enteritis, fatty liver, affecting the immune system, phlegm, and digestion and absorption of feed, undigested feed into aquaculture water body resulting in water ecology Imbalance, abnormal ammonia metabolism, these factors are one of the most common causes of water quality deterioration, pest and disease breeding. In a word, in the process of breeding quail, it is one of the most important technologies for the success or failure of breeding. The key is to maintain the flourishing growth function, good appetite and digestion, and maintain the amount of feeding and water ecology. The overall balance between normal metabolism of sputum excreta. Farming scale and environment coordination

The scale of breeding must be determined according to the mode of farming, the area of ​​the farm, and the conditions of the water source. A farm with a water surface area of ​​20 mu and a water volume of 3,000 tons/hour can have a seedling volume of 600,000 to 800,000. The daily water exchange rate is 60%-100%, and the water should not be drained in a short period of time to cause the water level to be too low, which will cause stress to the earthworms. Generally, the water volume is changed from 30% to 50% of the total body water for each change of water. The time schedule is 2-3 hours after eating. In summer, the temperature is high and the light intensity is strong. The water level should be raised as much as possible. When changing the water, it is better to change it at night and change it during the day (reducing the temperature fluctuation in the morning and evening). During the aquaculture process, squid should also pay attention to feeding in ponds, timely adjust the breeding density, clear the bottom of the pool, avoid over-differentiation, and deterioration of water quality in the breeding ponds. Diving in ponds in time will benefit the raising of the breeding effect and commodity rate. The cultivation of carp should pay attention to the regulation of water quality, and the low pH value, and the culture water with high ammonia and nitrite content will provide favorable conditions for the reproduction of pathogenic microorganisms. Usually, more water quality testing should be carried out, and problems should be eliminated promptly. During the cultivation of carp, proper culture of beneficial algae such as chlorella, diatoms and spirulina, and the addition of photosynthetic bacteria and nitrifying bacteria, etc., can effectively degrade the harmful substances in the aquaculture pond and inhibit the proliferation of pathogenic bacteria and their pathogenicity. effect.

Scientific medication

As far as aquatic animal infectious diseases are concerned, there are only four important links in the process of disease development: pathogens, routes of transmission, susceptible animals, and predisposing factors. The strategy of disease control is still to follow the principle of prevention. In the treatment of aquatic animal diseases, we must adhere to the principle of combining external consumption with internal medicine. Ultimately, we must introduce the immune prevention technology into the modern aquaculture industry to truly realize the healthy breeding of aquatic animals.

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