Emergency treatment method for quickly reducing water bloom hazards of freshwater fish aquaculture pond

Abstract

The invention discloses an emergency treatment method for quickly reducing water bloom hazards of a freshwater fish aquaculture pond. The method includes: adopting a physical method to drive most of cyanobacterial bloom in the freshwater fish aquaculture pond to a downwind position, performing purse seine to form a quasi-enclosure area; pouring biological flocculants to the quasi-enclosure area, completely pulling out cyanobacterial flocculation, then adding sustained-release microcystin degradation catalysts, and finally pouring a fish detoxifier with vitamin C serving as a main component into the aquaculture pond. By application of the method in emergency treatment of cyanobacterial bloom in the freshwater fish aquaculture pond, cyanobacterial biomass in aquaculture water can be remarkably reduced in extremely short time, microcystin in aquaculture water is effectively removed by catalytic degradation while immunity of cultured fishes is improved, and accordingly hazards caused by cyanobacterial bloom in the pond to the cultured fishes are reduced fundamentally. The emergency treatment method is efficient and high in ecological safety, and secondary injuries of the cultured fishes are avoided while hazards caused by cyanobacterial bloom in the pond to the cultured fishes are reduced sharply in short time. Therefore, the method is available for large-scale application in emergency treatment of cyanobacterial bloom in the freshwater fish aquaculture pond.

Description

technical field [0001] The invention belongs to the technical field of water body pollution control, in particular to an emergency treatment method for quickly reducing the hazard of algal blooms in freshwater fish culture ponds. Background technique [0002] The high-density and intensive aquaculture mode promotes the eutrophication of aquaculture water in my country, which in turn leads to the frequent occurrence of cyanobacterial blooms dominated by Microcystis in aquaculture ponds. The harm of blue water bloom to freshwater aquaculture is mainly in the following four aspects: 1) Microcystis has a short proliferation cycle and strong stress resistance, and can quickly occupy an absolute advantage in the aquaculture ecosystem, destroying the balance of the aquaculture ecosystem; 2) ) during the day due to CO 2 Concentrations decrease, Microcystis utilizes HCO 3 - The increase in amount leads to CO 3 2- The increase of the content will cause the pH value of the water b...

AI Technical Summary

Problems solved by technology

However, the above-mentioned emergency treatment methods for cyanobacteria blooms in aquaculture ponds have great limitations in practical application. For example, frequent water changes in freshwater fish aquaculture ponds cannot be completed in resource-based areas such as North China, and the number of ponds will increase continuously at the same time. Hydropower will consume a lot of energy, which will lead to an increase in breeding costs; although chemical agents such as copper ions and antibiotics have a strong algae inhibitory effect, they can easily cause damage to the ecological balance of the breeding pond and easily cause secondary pollution of the pond; Sensitive algae inhibitors will not cause secondary pollution, but killing a large number of Microcystis in a short period of time will lead to a substantial increase in the content of microcystins in the aquaculture water, which will seriously threaten the survival of farmed animals; Biological methods such as compound bacteria for emergency treatment of cyanobacteria blooms are slow, and it is difficult to be effective in a short period of time, and it is difficult to obtain good application results

In addition, after emergency treatment of cyanobacteria blooms, an antidote mainly composed of sodium humate is usually splashed into the culture pond. This type of antidote will absorb a small amount of soluble microcystin in the culture water, but the effect is minimal Sodium acid will not improve the immunity of farmed fish, which will lead to the death of farmed fish to varying degrees after emergency treatment of cyanobacteria blooms by chemical methods (using antibiotics and allelochemical algae inhibitors), which seriously endangers the economic benefits of aquaculture