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Effect of dissolved oxygen on the growth of Cynoglossus semilaevis

Tongue sole and turbot are both benthic fish, but unlike turbot, tongue sole will not float to the water even when feeding, which has higher requirements for the living environment. Dissolved oxygen in water is the biggest factor affecting the growth of tongue sole, so it is necessary to protect dissolved oxygen in order to raise tongue sole well.


At present, most tongue sole farmers in the market have understood the importance of dissolved oxygen in water, but there are still many misunderstandings in their understanding. They believe that as long as their fans are large and the amount of air stone cloth is large, they can obtain high dissolved oxygen. In fact, after field measurement, the dissolved oxygen of many farmers is not particularly good, because it is related to everyone's choice of fan gas stone. Many farmers choose the ventilator, but the gas stone is not good. The bubbles from the gas stone in the water are like the boiled water in the kettle, popping out. In this way, the oxygen is not dissolved in the water, so the dissolved oxygen in the water is not very high. Many customers use the nanotube aerator, and the bubbles are like those when washing clothes. They are very small and in the shape of foam. The dissolved oxygen in the water of such farmers is generally good, which can reach about 7 dissolved oxygen, which can fully meet the growth needs of tongue sole.


The higher the dissolved oxygen in the water, the better the growth effect of tongue sole. The influence of dissolved oxygen on the growth of tongue sole is summarized in the following aspects:


1. High concentration of dissolved oxygen can keep tongue sole in a comfortable living environment, which is conducive to the digestion and nutrient absorption of tongue sole after feeding, and can improve the growth speed of tongue sole.


2. High dissolved oxygen content in water can transform harmful substances such as ammonia, nitrite, hydrogen sulfide and other harmful substances into non-toxic or less toxic nitrates, sulfates and so on.


3. The high concentration of dissolved oxygen can make the tongue sole maintain a relatively clean living environment. The physiological state of the tongue sole is good, the constitution is good, and it is naturally not easy to get sick.


4. High concentration of dissolved oxygen can oxidize metabolites in water, which is conducive to aerobic bacteria decomposing organics in water and inhibiting anaerobic bacteria decomposing to produce harmful substances. Reduce the stimulation of tongue sole caused by the decomposition of organic matter in water.


It is recommended that farmers use nano tubes, because the bubbles emitted by nanotubes are smaller and more uniform than that of aerolite, which can significantly improve the dissolved oxygen in water. Under reasonable installation conditions, it can generally reach about 7. However, many farmers have found many problems using nanotubes, that is, love blocking. First, we should use high-quality nanotubes; Second, the installed nanotube length should match the roots blower.


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