Application of ph meter in aquaculture
First, let's talk about the role of the pH value of the water body:
The concentration of hydrogen ions has always been considered an important factor in the water quality of fish farming, and the pH value is usually measured when analyzing the water quality of fish farming water. This is because the concentration of hydrogen ions affects fish and fish farming production in many ways.
1. The ph value range in which fish can live safely is roughly 6-9, and the most suitable range is weakly alkaline in carps, that is, ph 7-8.5, and neutral in salmonids That is, the pH value is around 7. If the pH value exceeds a certain range, the upper limit is 9.5-10, and the lower limit is 4-5, which will directly cause the death of fish. The following is an example of 100% mortality of several fish under different pH values, and the exposure time that the fish endured. The PH value is within the range, and when it exceeds the optimum range, it will also have a negative effect on the life activities of fish, thus affecting the performance of fish farming. For example, the practice of fish farming has proved that fish are particularly sensitive to infectious fish diseases in acidic water (pH value below 5.5), have difficulty breathing even if the water is not hypoxic, have low digestibility of feed, and grow slowly.
2. In addition, the pH value also affects fish indirectly by affecting other environmental factors. For example, at a low pH value, the concentration of Fe ions and H2S will increase, and the toxicity of these components has a synergistic effect with the low pH value. The lower the pH value, the greater the toxicity; on the other hand, the high pH value will increase Ammonia toxicity. In addition, when the pH value deviates from the neutral to slightly alkaline range and becomes too high or too low, it will inhibit the photosynthesis of plants and the decomposition of bacteria; and the former will affect the oxygen status of the water body and the breathing conditions of fish. , which in turn will affect the concentration of organic matter in the water.
3. Secondly, the ph value also seriously affects the biological productivity of the water body. The inappropriate ph value will destroy the most important material basis for water body production - the supply of phosphate and inorganic nitrogen compounds. If the pool water is too alkaline, it will form insoluble tricalcium phosphate, and if it is too acidic, it will form insoluble iron phosphate and aluminum phosphate, which will reduce the fertilizer efficiency. The ph value also plays a major role in the nitrogen cycle, and the nitrification and nitrogen fixation are all based on weak alkalinity. The most suitable pH value is 7.0 to 8.5, which will be inhibited when encountering acidic or weakly alkaline conditions. In addition, the pH value also directly affects the photosynthesis of plants and the life activities of various microorganisms, thereby affecting the entire material metabolism of the water body.
