1.Impact of harmful substances
In the aquaculture water, due to the fermentation of many organic substances in the pool, it will generate many reducing intermediate products in the water, such as hydrogen sulfide, nitrite and ammonia nitrogen and so on. These products for many cultured fish will have a greater adverse effect, at the same time in the water body there are many aquatic organisms, especially some microorganisms such as bacteria or parasites, these relatively easy to cause harm to the majority of microorganisms are conditionally pathogenic bacteria. In the case of a slight deterioration of the water body, many fish products due to their own resistance to reduce the toxicity of pathogenic bacteria will lead to greater, thus forming a greater harm to aquatic products. Therefore, we must control the toxic substances in the water body.
2.The influence of high or low PH value
On the one hand, too high or too low PH value will produce great harm to cultured fish, and even cause the death of fish in batches; when the PH value is low, the water body is acidic, and then the PH value of the blood of cultured fish will be lowered, and the oxygen-carrying capacity of the fish is insufficient, which will easily lead to physiological hypoxia. Although the water body is not lacking in oxygen, the phenomenon of floating head of fish will also be seen. Reduced oxygen consumption will slow down the metabolic rate of fish, although providing sufficient things, but the fish always remain in a hungry state; on the other hand, when the PH value in the water body is too high or too low, the water quality of the water body will have a great impact.
When the pH value in the water body is less than 6, about 90% of the sulfide in the water body exists in the form of hydrogen sulfide, which strengthens the toxicity of sulfide, and when the pH value is more than 8, a lot of ammonia ions will produce poisonous ammonia, which is not conducive to the growth of fish. In short, if the PH value is not properly controlled, then the damage caused to the aquaculture is very big.
3.Impact of cyanobacteria on aquaculture
By the middle and late stages of aquaculture, the increase of cyanobacteria in the water body is a common phenomenon, and this problem must be solved by treating the different production stages of cyanobacteria. Cyanobacteria prefer to grow in water bodies with higher temperatures and containing more organic matter. Cyanobacteria life cycle will usually reach the four sides of the formation of a layer of light green oil film, so that the water body becomes more lean, encountered sudden changes in the weather will cause the water quality more rectified, strict through when the aquatic products led to the death of batches.
In summary, the management and control of water quality is a key link to ensure healthy aquaculture, only to ensure good water quality in aquaculture, in order to produce more safe and hygienic pollution-free aquatic products. The use of water quality sensor to monitor the water body, find problems in a timely manner to manage, try to avoid the occurrence of losses.
Currently there are many scholars have proposed, for fish and shrimp and other aquatic products disease control to gradually reduce the frequency of the use of drugs to prevent and control, but to choose the means of ecological prevention and control, so as to solve the problem from the root. Only to optimize the ecological structure of aquaculture water quality within the scope of aquaculture, in order to gradually let aquaculture into a virtuous cycle of development, in order to harvest more economic and social benefits.
The continuous optimization and improvement of aquaculture water quality is the need for healthy aquaculture of aquatic products, but also to protect the aquatic environment and promote the objective requirements of sustainable development, from another point of view, to ensure good water quality, can minimize the disease rate of aquatic products, so that less use of chemical drugs, to produce more safe and green aquatic products.
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