What is the role of aquatic plants in river crab culture? What are the points for attention?

In recent years, more and more people begin to engage in river crab breeding. Planting aquatic grass is the key factor for the success of river crab culture. Water grass is not only an indispensable plant bait for river crabs, but also an important place for shrimp and crabs to perch, eat, shell and avoid enemy damage. What is the role of aquatic plants in river crab culture? What are the points for attention? Let's find out together.

What is the role of aquatic plants in river crab culture?

The so-called "good grass" refers to the submerged plants such as Eloe algae, verticillum verticillata and bitter grass in the healthy cultivation of river crabs. The coverage rate of aquatic plants in the whole pool is controlled at 50% and 60%. As far as submerged plants are concerned, healthy breeding of river crabs has multiple functions.

1. The grass is crisp, tender and palatable, rich in nutrition, and is the natural bait for river crabs.

2. The ability of reproduction and regeneration is strong, which can not only purify the water quality, but also improve the sediment and create a good environmental condition for the growth of river crab.

3. It can provide an ideal place for river crabs to hide, perch and molt.

4. Photosynthesis of submerged plants in water can increase the amount of dissolved oxygen, absorb ammonia nitrogen and inorganic nutrients in water, and increase the transparency of water.

5. It can protect the slope and prevent the collapse of the pool ridge.

6. It can improve the quality and value of river crab. The river crab grows in the water with fresh water quality, high dissolved oxygen content, overgrown aquatic plants and rich bait, with bright color, large specification, taste and price similar to that of natural river crab, so as to achieve the purpose of increasing production and income.

7. It has certain pharmacological effects.

II. Matters needing attention in aquatic grass management in river crab culture

1. Scientifically control the density of aquatic plants and cut off excess aquatic plants in time.

The growth process of aquatic plants in the pond is a process of absorbing harmful substances in the water body, and then the pond as a carrier also has a load limit for aquatic plants. Once the number of aquatic plants exceeds this load limit, the oxygen produced by the combination of aquatic plants during the day can not meet the spontaneous oxygen consumption at night, and the aquatic plants will age and die. The principle of mowing grass is to cut off aging aquatic plants and promote the growth of newborn aquatic plants. In short, keep the proportion of aquatic plants in the pond not more than 30%, there should be a waterway in the middle of the aquatic plant area, and the width of the waterway should be about 2 meters.

2. Mud grass is the embodiment of water aging.

The appearance of mud grass is generally due to the aging of the water body, and too much organic matter is attached to the water grass. It is also very simple to deal with. First of all, sodium humate is used to remove water grass slurry and activate the growth of water plants again, then microbial agents are used to regulate water quality, reduce organic matter and improve algae phase, while biological bottom drugs are used to decompose organic matter in mud. At the same time, we should also pay attention to the floating site of aquatic plants, too much floating indicates that the feeding is insufficient or does not fit, combined with water quality detection and analysis.

3. Do not keep herbivorous fish and do not apply aquatic plant inhibitors

It is true that some herbivorous fish can consume too much aquatic plants, but often the growth of aquatic plants and herbivorous fish cannot be controlled by farmers, which is an unsafe factor. The vast majority of farmers no longer keep herbivorous fish, while aquatic plant inhibitors usually interfere with algae in the water and are prone to bad water and hypoxia. At the same time, river crabs and prawns that molt in aquatic plants are also toxic.