After a period of time, shrimp farming tanks sometimes have the phenomenon of “blackening†in the bottom of the pool, that is, the soil in the bottom of the pool loses its original earth color and becomes black and stench, and some are localized, while others occur in large areas, with varying degrees of severity. Old pools and old pools are particularly noticeable. This phenomenon is one of the reasons for the aging of shrimp ponds and it is very unfavorable for aquaculture production. I. Causes of blackening of the bottom of the pool Due to the absence of dredging or dredging before cultivation, the retained sludge contains a large amount of organic matter, and when the temperature of the water is appropriate, it is metamorphosed by dark hair; the amount of feed is too large or the feeding is too concentrated. , resulting in excess feed, residual bait spoilage during a period of time, black hair stink, then polluting the bottom of the pool; a large number of aquatic plants growing at the bottom of the pool, when the conditions are not suitable for water plants to die, a long time causes decay, deterioration, causing the pool bottom black; The organic matter content of the pool is too large. When the water enters the water, the organic matter enters the shrimp pond with the water. After the organic matter precipitates, the organic matter is spoiled and contaminated and the bottom of the pond is blackened. Second, the shrimp is affected by the harm 1. Affect the quality of the pool due to black hair after the end of black and odor, shrimp in such an environment for a long time will affect its color and flesh, so that body color is not bright taste, affect the price. 2. Affects the growth of shrimps in a refreshing environment. Substances polluted and darkened will produce harmful substances that are not conducive to the growth of shrimps. When the sediments are not good, shrimps are reluctant to infiltrate, making it easy to change their habits and affect their growth. development. 3. Initiation of disease, resulting in death of shrimp pool bottom "black", causing pollution at the bottom, easy to breed bacteria. Propagation of bacteria can easily lead to the occurrence of shrimp disease, affecting production at times, causing heavy deaths and causing losses. Third, solve the bottom of the pool of black measures 1. Thoroughly dredging and disinfection should be used to flush the bottom of the pool 1 to 2 times. 2. According to the number of shrimp, individual size, weather, seasons, water quality and other reasonable materials. 3. Improve the bottom environment through the aeration of the aerator, reduce the chance of blackening the bottom of the pool, slow down the blackening process, and reduce hazards. 4. Pay attention to the replacement of new water to prevent the entry of water with high organic matter into the shrimp ponds, take comprehensive measures to regulate the water quality, keep the water fresh, and pay attention to the use of biological agents such as photosynthetic bacteria to improve water quality and sediment quality. 5. Take various measures to control the growth and reproduction of aquatic plants and prevent the growth of aquatic plants (especially filamentous algae). If too many aquatic plants or aquatic plants are found to be dead, they should be removed in time to prevent deterioration. 6. It is possible to splash Shanghai iron slag into a blackened area with conditions, 1.5 kilograms per square meter of water, in order to delay the blackening process and to reduce the harm.
Food antioxidants are food additives that can prevent or delay food oxidation and deterioration, improve food stability and prolong storage life. Oxidation will not only make the oil in the food deteriorates, but also make the food fade, discolor and destroy vitamins, so as to reduce the sensory quality and nutritional value of food, and even produce harmful substances, causing food poisoning.
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