Prevention and control method for blue-green algae in marine shrimp culture water

Abstract

The invention discloses a prevention and control method for blue-green algae in marine shrimp culture water. The method comprises the following steps: (1) height of water in a culture pond is reduced to 2-3 meters, and 350-500 g / mu of a biological treatment agent is evenly scattered to water in the culture pond once every 15-20 days from the spring at the air temperature of 20-25 DEG C to the late autumn at the air temperature being lower than 15 DEG C; (2) 30%-35% of water in the culture pond is pumped out after the biological treatment agent is sprinkled for 15-20 hours, identical culture water is injected, then 8-10 g / mu of bdellovibrio bacteriovorus is added to water after 18-26 hours, and the number of viable bacteria reaches 150 billion / gram or more; (3) after 20-30 hours, 3-6 g / m<3> of sodium thiosulfate is scattered uniformly into water in the culture pond once every 20 days until scattering of the biological treatment agent is stopped. With the adoption of the method, the blue-green algae are effectively killed, a prevention and control effect is realized, the water quality is improved, the blue-green algae are prevented from excessive multiplication, and reproduction of other aquatic organisms is not influenced. The method is simple and convenient to operate, and the cost is low. The prevention and control effect is better particularly when the biological treatment agent is used cooperatively with the bdellovibrio bacteriovorus.

Description

technical field [0001] The invention relates to a method for preventing and controlling blue-green algae in the water body of cultured sea shrimp, belonging to the field of environmental protection. Background technique [0002] Soluble nutrients in water exist in large quantities and their proportions are out of balance. Phosphorus is easily absorbed by the bottom mud, so phosphorus is the limiting factor for all algae in aquaculture water, and blue-green algae are no exception. Compared with other algae, cyanobacteria have the absolute advantage of "crazy growth" in water bodies with sufficient phosphorus sources. This is because cyanobacteria belong to a kind of primitive eukaryote, like soybean nitrogen-fixing bacteria, it has the function of fixing nitrogen source naturally, that is to say, cyanobacteria do not need nitrogen source in the process of reproduction, as long as there is phosphorus source, they can quickly In addition, in order to adapt to environmental ch...

AI Technical Summary

Problems solved by technology

If it is just in time for fish fry or shrimp fry to enter the pond, they cannot survive in this water body at all, and the survival rate of fry will be very low

In addition, whether it is fish fry or shrimp fry, in such a high pH water environment, once it catches up with the "stormy weather", the dissolved oxygen in the water body will be supersaturated, leading to air bubble disease and a large number of deaths, resulting in direct economic losses.