What kind of aquatic plants are good for raising crayfish in ponds? When do you plant it? Cultivation method of attached aquatic plants

There is a saying among crayfish farmers-"whether the lobster is good or not, whether there is grass in the pond; whether the lobster is big or not, the grass in the pond is in charge." this is about the importance of aquatic plants in crayfish farming. So what kind of aquatic plants should be planted to raise crayfish in the pond? When will you plant it? What are the cultivation methods of aquatic plants?

When does crayfish farming grow aquatic plants?

Basically, it is best to plant aquatic plants before releasing crayfish seedlings, which is beneficial to the survival and growth of crayfish.

However, it should be noted that the success rate of lobster culture in the high temperature period (mainly summer and autumn, June-September) is very low, and the main reason why most lobsters can not be raised during this period is that there is no way to grow aquatic plants in shrimp ponds. With water peanuts, water hyacinth and other inferior water plants to replace, the final lobster yield is very poor. From the experience of a few successful shrimp farmers in the high temperature period, aquatic plants are still the main factor restricting the yield of lobster. The most ideal aquatic plant in summer and autumn is verticillium verticillata, which is often called "lantern bubble".

Second, what kind of aquatic plants are good to grow crayfish in the pond?

1. Why should crayfish grow aquatic plants?

(1) rich feed

The eating habits of crayfish are very miscellaneous, mainly animal, but aquatic plants are fresh and refreshing, nutritious, crayfish are also very fond of, which is the supplement and regulation of animal feed.

Aquatic plants can create a good ecological environment, where there are many species of aquatic plants, dense growth places, small fish, shrimp, shellfish and other benthos are also relatively rich, so planting aquatic plants can increase crayfish field animal bait.

(2) improving water quality

Aquatic plants can carry out photosynthesis, increase the amount of dissolved oxygen in water, absorb nutrients in water, reduce the fertility of water, maintain fresh water quality and stabilize pH value, so as to provide a water environment with good water quality and rich dissolved oxygen for crayfish growth and development.

(3) promote the growth of crayfish

Aquatic plant is an ideal place for crayfish to live, which is beneficial to its climbing and provides supporting conditions for its activities. Because of the concealment of aquatic plants, it can provide a good place for shrimp molting and help crayfish to avoid enemy damage. In the hot season, aquatic plants can cover the shade and cool down, so it is a good place for crayfish to stay cool and summer. In addition, aquatic plants have special pharmacological effects, which can reduce the incidence of disease. where there are many aquatic plants in fields or ponds, the survival rate of crayfish is high; aquatic plants can improve the internal and external quality of crayfish.

2. Main aquatic plant varieties

There are mainly three types of aquatic plants planted in crayfish ponds: submerged plants, floating plants and water-standing plants.

(1) the main varieties of submerged plants are: Ellosia, bitter grass, Potamogeton crispus, Rabdosia malayensis, goldfish algae and so on.

(2) the main varieties of floating plants are: water peanut, water hyacinth, water lotus, duckweed and so on.

(3) the main varieties of water-bearing plants are: Reed, Zizania caduciflora, Sagittaria, cattail and so on.

Note: there must be a variety of aquatic plants grown in crayfish ponds.

3. Planting methods of aquaculture crayfish

1. Planting method

Verticillum verticillata, Eloe algae and other stemmed weeds are suitable for planting, and they are generally planted in winter and spring. The method is to cut the aquatic plants into small sections, with a length of 15 cm to 20 cm. Like transplanting rice seedlings, the bundles of cut grasses are evenly planted in the mud at the bottom of the pool, and the plant and row spacing are controlled at about 20 cm respectively. After planting, inject 20-30cm water into the shrimp pond and gradually deepen the water level after the water plants grow all over the pond.

2. Throwing planting method

Floating-leaf plants such as lotus and water lilies can be wrapped in ooze and then directly planted into the pond so that their roots can grow in the sediment and let the leaves float on the surface of the water.

3. Transplanting method

Water-bearing plants such as Zizania caduciflora and Zizania latifolia should be transplanted by roots. when transplanting, the injured leaves and slender and inferior seedlings should be removed, and the transplanting location should be in the shoal on the edge of the pool. It is required that the root of the seedlings should enter water between 10-20 cm, and the density should be controlled at 30-50 ∕ 667m2.

4. Cultivation method

For floating plants such as water peanuts, water hyacinth and duckweed, bamboo poles and grass ropes can be used in the ponds as a "special zone" for intensive cultivation, so that the above-mentioned aquatic plants can grow and reproduce in the "special zone" environment, so as to supplement the shortage of aquatic plants in shrimp ponds.

5. Sowing method

The most commonly used aquatic plant is Sophora flavescens. The sowing method of bitter grass is suitable for shrimp ponds with less silt. Soak the bitter grass seed in water for 1 day, then crush the soft fruit, rub out the fine seeds in the fruit, add about 10 times the amount of fine sand, mix well with the seeds before sowing. When sowing, the water level is controlled at 10-20 cm, and the sowing rate is about 50 grams per 667 square meters. After sowing, the management should be strengthened to improve the survival rate of Sophora flavescens so as to form a dominant population as soon as possible.