River crab damage preventing method for planting vallisneria natans by bottoming polyethylene mesh

Abstract

The invention discloses a river crab damage preventing method for planting vallisneria natans by bottoming a polyethylene mesh. Newly planted vallisneria natans is protected in a way of paving a polyethylene mesh with the mesh being about 1cm*1cm in a vallisneria natans planting region on a plate field at the bottom of a crab pond, and by using the method, clamping the vallisneria natans by the river crabs is stopped, and stolons of the vallisneria natans are favorably protected, so that the vallisneria natans can be effectively prevented from being damaged by the river crabs, the normal growth of float grass is guaranteed, and the method has important promotion effects on improving the ecological environment of the pond and improving the yield and quality of the river crabs.

Description

technical field [0001] The invention belongs to the field of aquaculture, and in particular relates to a method for planting bitter grass on the bottom of a polyethylene mesh that can prevent river crabs from being damaged. Background technique [0002] Bittergrass, also known as flat shoulder grass and noodle grass, belongs to the genus Bitterweed in the family Hydrochardaceae in botanical classification. With stolons, white, smooth. The leaves are basal, linear or band-shaped, green or slightly purple-red, with 3 sepals, varying in size, floating on the water in a boat shape, the middle one is smaller, and the middle rib is keel-shaped, extending upward like a sail. [0003] Bittergrass is a common aquatic plant in river crab breeding. It has the advantages of crab eating, high temperature resistance, and no smelly water. The crabs raised in ponds dominated by bitter grass have green belly, white belly, golden feet and red hair. The quality is better than that of other aq...

AI Technical Summary

Problems solved by technology

The disadvantage of bitter grass is that it is easy to be pinched or uprooted by river crabs. River crabs only like to eat the white and tender part of the base of the leaves, and the utilization rate is not high.

Moreover, during the high temperature season, the river crabs will be severely damaged. If they are not properly protected, they will be basically destroyed within 7 to 15 days, which will easily cause no grass in the pond and have a serious impact on the growth of river crabs.