Green feed for fish has very important significance to make up for lack of concentrate feed, reduce the cost of fish farming, and improve the breeding efficiency. In order to enable farmers to better develop and use green feed for fish farming, the following issues should be noted in the actual production.
1? Choosing excellent green fodder varieties: At present, the most common fine green fodder is ryegrass, sudangrass, bitter leeks, elephant grass, schisandra, duckweed and so on. Different green feeds have different nutritional values, and some are even significantly different. Such as the quality of legumes cultivated for legumes, the bait coefficient of 25 to 30, is about 1/3 of the general wild weeds. Therefore, it is very important to choose a good green feed variety. In the different growth stages of fish, different fine green fodder should also be selected. In the production can be selected according to the difficulty of the source of green feed and the needs of the growth and development of fish.
2? timely cutting: green feed in different growth stages, which contain different nutrients. Grasses that are not timely castrated, often due to increased degree of lignification, result in a significant decline in the utilization of forage grasses by fish. General grasses are castrated at the time of heading and legumes are castrated at the early stage of flowering. Castration was premature and the nutritional value was high, but the grass production per unit area was too low. However, when the castration was too late, the nutritional value of fresh grass dropped significantly. The castrated pasture should be fed in a timely manner, and it should be stored for a long time. The nutrients of the pasture are easily lost and the palatability is poor.
3? Processing modulation: In addition to adult fish breeding can be directly fed after castrated green fodder, if used for seedling cultivation, green feed should be chopped or beaten. Fermentation methods can also be adopted to increase the palatability and utilization of green feed. Such as water peanuts, fish can not directly digest it, and poor palatability, but after fermentation, the fish can be eaten. In order to adjust the deficiency and ensure the constant supply of green fodder, on the one hand, planting varieties can be reasonably arranged, and on the other hand, the green fodder produced during the peak season can be made into hay.
4. Strengthen prevention and treatment of fish diseases: Green feed is mainly used by herbivorous fish, and herbivorous fish are prone to disease. Normally, attention should be paid to the disinfection of water bodies and prevention of the use of baits, and the amount of feeding and timing of feeding should be properly arranged. It is found that fish diseases must be actively treated and cannot be delayed.
5. Adhere to the combination of green and fine: Although the nutritional value of green feed is relatively comprehensive, its own concentration of nutrients is low, and it is difficult to meet the energy and other nutrients required for rapid growth of fish. Cellulose in green feed cannot be used effectively by fish. Only relying on green feed is difficult to obtain high yield of fish farming. Moreover, the amount of grass and fish farming is high, and the labor intensity is also high, and there must be a certain amount of feed for the guarantee. This is not suitable for large-scale, intensive production. The more feasible way is to combine green and fine and complement each other. As for the proportion of green and concentrated feed, it depends on several factors such as the production unit, the source of concentrate, the price of concentrate, the degree of intensive fish farming, and the requirements for fish production.
6. Fully use the pond to cultivate green fodder: When there is a shortage of cultivated land, use ponds, banks, embankments, etc. to grow green fodder. In the lakes and reservoirs, fish farming can use the winter water level-reducing area to grow green feed. When the spring water level rises, the fish will be submerged. Pond fish farming can use green ponds, ryegrass, wolfberry seeds, etc. to achieve the combination of planting and breeding, and ultimately achieve high yield, low cost, high efficiency, and low consumption.
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