To raise water to raise crabs, it is necessary to grow grass. Cultivating high-quality grass aquaculture water is an important prerequisite for breeding quality and large-scale river crabs. There are four kinds of aquatic plants commonly used in adult crab breeding: Goldfish, Hydrilla verticillata, Vallisneria, Elodea. These four kinds of aquatic plants are all water-suspended plants, and they are also proven water-grass varieties that can be used for breeding crabs after years of practice.
First, biological characteristics
1. Leaves black algae. The characteristics of the algae on the leaves are high temperature, long growth period, good adaptability, and strong regeneration ability. The crabs like to eat, suitable for sowing or planting in well-lit ponds and large water surfaces. The black algae of the leaf can be rooted and cut off by the river crab, and has strong vitality, so it will not spoil the water quality.
2. Goldfish algae. Goldfish algae has the advantages of high temperature resistance, crablike food, and strong regeneration ability. The disadvantage is that it is prone to smelly water. According to this feature, goldfish is more suitable for cultivation in large water surfaces. In addition, when aquatic plants are prosperous, they must be thinned to avoid photosynthesis and dead grass stinking when they are too dense.
3. Elodea. Elodea germinates early and grows fast. When other aquatic plants have not grown in the early stages, only it can be considered an ideal place for growing crabs, habitats, shells, and avoiding the enemy. This grass is not heat-resistant and grows densely. When the water temperature reaches 30°C, the growth is basically finished, and it is also easy to smell water. Therefore, the coverage rate of this type of aquatic herb should be controlled within 20%, and farmers can use it as a transitional grass for planting.
4. Hardship grass. Vallisneria possesses the advantages of crab eating, high temperature resistance, and non-stinking water. The disadvantage is that it is easily damaged. Especially during the high-temperature period, the crabs are fed to change their seasons. If you do not pay attention to protection, the damage is very severe. Some cultivated waters, which are dominated by Vallisneria, are trapped by crabs in less than a week in the high-temperature period. It is too late for fish farmers to harvest grass. According to the author's calculations, the cost of aquaculture, which is dominated by bitter grass, is 70-120 yuan per 667 square meters (1 acre). Some of the water bodies that were not able to harvest grass in time have even experienced deterioration of water quality. Some water bodies have become odorous and “sweet green sharks†have appeared, causing a large number of deaths.
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