In the province from May to June this year, the rainfall is relatively small, but since July, the temperature in Jiangsu Province has been relatively high and the rainfall has been relatively high. Recently, the newspaper “Fiji Technology 110†received a call from several aquaculture farmers. They reported that due to the recent continuous rain, some problems have arisen in farmed fish. Although the lethality rate is relatively low, the occurrence area is relatively large and there is a difference in aquaculture. Great influence.
Diatom breeding too much
According to Chen Xubao, Fangxiang Town, Hanjiang District, Yangzhou City, he has a pond of about 10 mu, which mainly cultivates ornamental fish such as koi. Recently, the transparency of pond water is only about 30 centimeters. The algae in the pond make the water body rust color in the morning, turn red at noon, and flood in the evening. Green, once used to kill algae with copper sulphate, also used EM bacteria, etc. to improve water quality, the effect is not very good. He asked: What are the main algae in the pond? What should I do?
The reporter reported this situation to Dai Jun, the head of the Zhijiang District Aquatic Technology Guidance Station. The station owner dispatched the relevant fishery technician to the site the next day after learning about the situation. After testing the fish pond water conditions, the fishermen’s skills The member said that the algae that caused the various color changes of the fish ponds may be diatoms, and the whole pool can be detoxified and protected for 4 to 5 days. After the algae are reduced, the water is immediately changed, and the water is promptly refreshed after changing the water. The pond is suitable for cultivation. The ecological environment has the advantage of algae.
Prevention methods for algal overgrowth in ponds include: reconstructing old ponds every year during dry ponds in winter, removing excess silt, and disposing of quicklime to disinfect ponds to eliminate pathogens and algae; Change water and use biological agents to improve water quality and maintain a good ecological environment.
Duckweed breeding too fast
An aquaculture farmer in Huai'an reported that the ponds of his farmed eel and squid were covered with a layer of duckweed. He asked what method can be used to clear duckweed without harming the fish.
The methods for clearing duckweed in fish ponds mainly include: (1) biological removal, raising some grass carps in ponds or breeding some water birds on the water surface; (2) removing fish by hand, and using broomsticks when wind blows duckweed to the side of the pond. (3) Before the sun rises in the morning, sprinkle duckweed with grass ash on the fishpond. In the evening, the duckweed that is sprinkled with grass ash will basically die. At this time, new water should be added and oxygen be added in time. It can be processed several days in a few days. After the duckweed is treated, the pond should be immediately fed with water and new plankton should be cultivated as feed for the catfish.
Hepatobiliary syndrome in grass carp
Xulingbao of Danling City, Fuling Town, reported that a small amount of grass carp had recently died in his pond. His grass carp was dissected and his liver was swollen and purple. His intestinal tract and fistula were normal, there was no congestion, and the anus was not swollen. The main feed is pelleted feed. He asked: What is the disease of grass carp? How should I treat?
According to the readers' analysis, his grass carp fed pellet feeds for a long period of time. He may have hepatobiliary syndrome. He should immediately reduce the amount of feed, and regularly use povidone-iodine, quicklime, etc. to disinfect and multiply the amount according to pond culture conditions. Feed some green feed, can also be added in the feed allicin, multidimensional, Sanhuang scattered treatment, if grass carp associated with bacterial enteritis, gill disease, etc. can be added to the feed florfenicol treatment.
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