1, planting the type of aquatic plants
Aquatic plant transplantation should pay attention to the transplantation of aquatic plant species, selective transplantation, floating plants, submerged plants, water plants, all three should be taken into account, to maintain the appropriate proportion to adapt to the requirements of freshwater crayfish growth and habitat. Currently the main transplanted aquatic plants are: water lily, water hyacinth, locust leaf pimpernel, water celery, yellow water dragon and other floating plants; reeds, wild wild wild rice, cichlid mushrooms, cattail, lotus root and other submerged plants; Malay eyes of the seed cabbage, according to Chlorophytum, Goldfish Algae, Bitter Grass, algae and other submerged plants, if necessary, can be paved a small amount of straw, reeds and other plant stalks, tea tree branches, Italian poplar (or Sycamore) leaves, willow roots, palm fronds and so on! Favorable baby shrimp molt and hide. Jiangsu area shrimp pond planted more peanuts and minced grass: peanuts in late fall to form winter buds overwintering, available for crayfish moult, hiding place, its roots are quality bait for crayfish. Mint grass winter germination and growth, the spring that is the formation of grass communities, conducive to the growth of spring crayfish molt, hiding, improve the survival rate.
2, watercress planting area
Watercress put according to the amount of baby shrimp, but the total area is generally no more than 1/2 of the pool area. Fresh crayfish on the water quality requirements are high, watercress coverage is too large, it will bring about two unfavorable factors: one is to absorb fertilizer, so that the shrimp pond water quality is thin and thin, affecting the growth of crayfish shrimp; the second is easy to rot at elevated temperatures, deteriorating the quality of the water, caused by flooding the pond.
3, aquatic grass cultivation methods
There are a variety of cultivation methods of aquatic grass, should be based on different aquatic grass to take different methods of cultivation of aquatic grass, the following method of cultivation of aquatic grass to make an introduction.
(1) planting method
This method is generally carried out before the shrimp stocking, the first shallow irrigation pool water, rotunda black algae, Ileaginous algae and other stemmed aquatic grass cut into small segments, the length of about 15cm ~ 20cm, and then inserted into the bottom of the pool as evenly as the transplantation of rice seedlings. The bottom of the pool is more silt, can be directly planted. If the bottom of the pool is hard, you can loosen the bottom mud beforehand and then planted.
(2) thrown into the method
Lings, water lilies and other floating leaf plants, can be used to tightly wrapped in soft mud and thrown directly into the pool so that their rhizomes can grow in the substrate, the leaves can float on the water surface. Around March each year, can also be in the bottom of the canal or ditch, digging up the bulb of bitter grass, with mud thrown into the ditch, let it grow, for freshwater crayfish to eat.
(3) transplanting method
Wild rice, cichlids and other water plants should be transplanted with the roots, transplanting, should be removed from the injured leaves and slender poor quality seedlings, transplanting location can be in the pool side of the shallows, the requirement of the seedling roots into the water in the 10cm to 20cm between the entire plant can not be too much, keep 30-50 per mu can be, otherwise it will be a large number of occupied water body, but instead of causing adverse effects.
(4) Cultivation method
For floating leafy plants such as duckweed, can be fished out at any time according to the need, but also in the pool with bamboo poles, grass ropes and so on in a corner, to cultivate. As long as the water to maintain a certain degree of fertility, they can grow well. If the water is not very fertile, a small amount of chemical fertilizer can be used, chemical water sprinkling, to promote their growth and development. Water peanut because of strong vitality, should be transplanted in small quantities to supplement the other water plants.
(5) seeding method
In recent years, the most commonly used water plants are bitter grass. Bitter grass planting is used for seeding method, for a small amount of silt in the pond is most suitable. Sowing when the water level control in 15cm, the first bitter grass seeds soaked in water for a day, and then the soaked soft fruit crushed, the fruit in the tiny seeds rubbed out. Then add about 10 times the amount of fine sandy loam, mix well with the seeds and sow. Spread the seeds evenly when sowing. The amount of seed sown is 1 kilogram per hectare of water surface. After seed sowing, we should strengthen the management to improve the survival rate of bitter grass, so that it can form a dominant population as soon as possible.