1, destroying the ecological balance

In the early stage of plant red tide, due to the photosynthesis of plants, the water body will have high chlorophyll a, high dissolved oxygen and high chemical oxygen consumption. This change in environmental factors has led to the failure of some marine organisms to grow, develop and reproduce normally, leading to the escape or even death of some organisms, which has destroyed the original ecological balance.

2. Destroy fisheries

Destroy the bait base of fishing ground, leading to the reduction of fishery production. The abnormal development and reproduction of red tide organisms will cause mechanical blockage of economic organisms such as fish, shrimp and shellfish, which will suffocate these organisms. In the late stage of red tide, a large number of red tide organisms died. Under the action of bacterial decomposition, it can cause serious hypoxia in the environment or produce harmful substances such as hydrogen sulfide, resulting in hypoxia or poisoning death of marine organisms.

3, affecting human health

Some red tide organisms secrete red tide toxins. Fish and shellfish may not be poisoned in toxic red tide areas, but biotoxins can accumulate in the body, and their content greatly exceeds the acceptable level of human body when eaten. If these fish, shrimp and shellfish are accidentally eaten by people, it will cause human poisoning and even death in severe cases.

Second, the harm of water bloom

1, affecting drinking water

By producing odor substances and cyanobacteria toxins, the safety of drinking water sources and aquatic products is affected, and microcystins affect human health through the food chain.

Step 2 block tap water

The filtration device in the waterworks is full of algae, which floats on the water surface and affects the landscape, and has an unpleasant smell.

3. Water pollution

Due to the accumulation and anaerobic decomposition of cyanobacteria blooms in water source areas, tap water stinks and water pollution incidents occur.

4, directly affect human health.

MCRST, a secondary metabolite of cyanobacteria bloom, can damage the liver, promote canceration and directly threaten human health and survival.

Extended data:

Control method of water bloom

1, using physical methods

Fishing filamentous algae and other floating objects in the water. If conditions permit, algae can be removed by circulating filtration.

2, using chemical methods

Use chemical agents, such as copper sulfate, quaternary ammonium salt, activator, potassium permanganate, polyaluminum chloride, ferrous sulfate, etc. Killing, flocculating and precipitating excess plankton and algae can quickly improve the water quality and see the effect.

However, these effects are only temporary and partial. Because the degraded nutrient source has not been fundamentally eliminated, the original benthic organisms in water have strong anti-pollution and anti-killing ability. Once the concentration of these chemicals is reduced and the reaction effect is weakened, these lower organisms will grow rapidly and return to their original state.

3. Adopt composite method:

The clay containing microbial inoculants is used to adsorb algae in water, and then the clay wrapped with algae is flocculated and settled by flocculant, which blocks the light condition of algae growth, achieves the purpose of gathering algae from water in a state of uniform distribution and separating them from water, and increases the transparency of water.

4. Adopting the method of biotechnology (establishing artificial ecosystem)

① Planting aquatic plants: select aquatic plants and ornamental plants suitable for local water bodies, including submerged plants, emergent plants, floating plants and ornamental plants. The function of aquatic plants is all-round, which cannot be replaced by other means.

② Adding proper amount of fish and shrimp fry: Fish and shrimp are the most typical consumers in the biological chain, and they can convert carbohydrates, primary protein and fat in plant state into advanced protein and fat. Herbivorous fish, such as grass carp. Omnivorous fish, such as crucian carp and flat fish; Carnivorous fish, such as Qing Wu, snakehead and mandarin fish; Others specialize in plankton, such as silver carp and bighead carp.

When stocking fish and shrimp, we should pay attention to the collocation between herbivorousness, omnivorousness and carnivorousness. The stocking quantity should be adapted to the water area; We must also control the growth and reproduction of fish and shrimp. Raising fish and shrimp in water can consume carbohydrates, primary protein and fat in water, and control the density of plants and plankton in water to some extent. At the same time, it can also provide food for the same kind.

(3) Add a proper amount of snails, mussels and other shellfish: snails, mussels and a large number of benthic organisms form another world at the bottom of the water, which not only complement each other, but also consume a lot of leaves, residues, corpses and excreta. Some small invertebrates also have the function of decomposing organic matter.

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