Dealing with high temperature and drought, tilapia farming water transfer is the key

In late June, when the journal visited Hainan, Hainan Baolu Aquatic Products Co., Ltd. learned that the Hainan News Channel recently reported that a tilapia species in 4 fish ponds in a farm in Taizhou, Zhejiang Province, which manages more than 100 mu of fish ponds in Wenchang Wengtian. In the breeding accident, 140,000 kilos of fish died all night. The farmer reported the case locally and the police went to investigate and collect evidence. However, the results of the inspection of dead fish and water samples have not yet been concluded. Ji Shengrong, general manager of Baolu, believes that this type of accident is likely to be related to the deterioration of the water environment caused by persistent high temperatures in Hainan since the drought and drought this year. In particular, the freshwater resources in the Wenchang area are very scarce, coupled with the management practices of farmers. Improper use of drugs and other factors. High temperature and drought, severe breeding situation It is understood that by the end of June, the average rainfall of Hainan Island this year is only 372.25 millimeters, which is 31% lower than the average for many years. Although it has entered the flood season, Hainan's hot and rainy weather continues. The Wenchang area, as a dense area for tilapia breeding, has always been one of the hardest-hit areas since the Streptococcus outbreak in 2009 due to the lack of large reservoirs and rivers and the shortage of freshwater resources. In the afternoon of the same day, the journal also accompanied Chen Zibin, sales manager of Baolu Road, and Wang Jian, a technician from Baolu Aquatic Slope Service Station, visited the farmers and conducted some basic water quality tests on the fish ponds where the fish was raised by several fish farmers. The results showed that the water's ammonia nitrogen, pH and other values ​​are too high, of which the pH is even closer to 9.5. Chen Zibin explained that the resulting high pH was mainly due to the high water temperature and strong light in summer, and the water body was prone to eutrophication, causing a large outbreak of blue-green algae. Wang Jian said that this type of situation is not uncommon in the Wenchang area, and that this blue-green algae encounters a large number of deaths in the wake of abrupt changes in the weather, which can cause problems such as lack of oxygen and algae decomposition and water quality, which can easily lead to breeding. The accident occurred. How should farmers respond to this situation by increasing oxygen and diverting water to maintain a good water environment? Wang Jian said that in the case of high temperatures, farmers first need to do a good job of oxygenation. At present, in order to save costs, many farmers need only one aerator for the 56-acre fishpond and they rarely turn on oxygen. These practices are undesirable, usually on a sunny afternoon (1-3 points). The aerators should be opened in the middle of the night and the aquarium should be increased accordingly. It is advisable to allow the water to circulate. In addition, when the water quality is poor, it is necessary to reduce or stop the feeding. "Because the fish is quite fragile at this time, the appetite for feeding is very low, and the feed water will spoil the water quality." During the high temperature season, when algae over-proliferate and the pH of the water is too high, many farmers will often use disinfectants, algaecides, etc. to prevent diseases and regulate water quality. However, there are risks in this way. It is often seen that the dose is small and no effect is seen, and farmers often increase the dose to cause a culture accident. Of course, the safe way is undoubtedly to advise the qualified fish farmers to change the water properly. However, for the case where there is no water exchange condition in Wenchang area, it is possible to improve the water body by pouring antidote products such as organic acids. Chen Zibin said that acetic acid can also quickly reduce the pH of the water, but the duration is short, and it will rebound after three or two days. Regularly sprinkling microbial preparations such as EM bacteria and enzyme bacteria to regulate water quality is one of the feasible methods. The proliferation of beneficial bacteria inhibits the over-proliferation of algae, decomposing organic matter and improving the body of water. However, Wang Jian also reminded farmers that if they use inferior products, the nutrients used by the beneficial bacteria will be used by the algae, which will lead to more vigorous algal blooms. In this regard, Cai Zengshan’s engineer at Wuhan Heyuan Green Bioengineering Co., Ltd. also believes that the best way is through microbial control, but he also agrees that the current microbial preparations are not properly monitored and have a large number of brands with uneven quality. From the appearance, it is difficult to discriminate whether the product quality is good or bad. When farmers purchase, they can't blindly try to buy cheap products, but they should choose a good word of mouth or a good product that has been used effectively. Streptococcus can be said to be explosive by preventing the constant high temperatures of streptococci and the harsh culture environment. In this regard, Chen Zibin believes that in addition to the day-to-day management work of farmers, the ponds that put the seedlings need to use good poisoning, and only when the water is adjusted, the seedlings should be planted; when stocking, the stocking density should be reasonably controlled according to the water quality; Ponds should fish out as soon as possible to avoid the various risks of high temperature period.

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