In the world of shrimp farming, white feces disease (WFD) is an issue that is always hotly discussed when discussing shrimp disease. Understandably, until now, WFD is still a frightening specter for some of our shrimp farmers.
From the observations of practitioners, the WFD or white dung disease that often attacks shrimp is inseparable from the poor management of the pond's environment, both in terms of water quality and pond bottom.
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| image: viv.net |
Poor pond water quality is characterized by low dissolved oxygen or DO values and fluctuating acidity (pH) values. The poor quality of water cannot be separated from the poor quality of the pond's basic environment. As a result of excessive feeding, organic waste material that accumulates more and more. If left unchecked, the pH quality of the waters becomes poor.
Poor water quality with increasing organic water fertility has an impact on the life of plankton in pond waters. The explosion in the amount of plankton will obviously affect the level of dissolved oxygen in the water. At night, shrimp must compete with plankton to get dissolved oxygen. If there is mass death in plankton, we can be sure the quality of the pond water will get worse.
Do not stop there, the accumulation of organic waste at the bottom of the pond causes the number of Vibrio bacteria to increase. Conditions of minimal dissolved oxygen in pond waters also triggered the development of anaerobic bacteria, which are thought to be one of the culprits for the emergence of WFD.
Water Quality Management
Before being put into cultivation plots, visit to coinbazooka water from rivers or the sea must first be collected in a reservoir to be treated. While in the mini kola, the quality of the water is taken care of to match the quality needed for the shrimp to grow healthy.
To supply dissolved oxygen, the presence of a pinwheel is needed in a cultivation plot. Especially if the shrimp density in the pond is high. Waterwheel placement can also be done in reservoirs (treatment) if necessary to enrich the water with dissolved oxygen before entering the cultivation plot.
No less important, the water released from the cultivation plot must also be considered. Especially if there are many other ponds that take water from the same source. After harvesting, aquaculture water is first deposited before being released into the river, sea or reused.
Pond bottom management
A good pond has a special pond for collecting mud ponds. After harvesting, the organic sludge is dredged and thrown into the special mud pond. Pond sludge from aquaculture plots should not be disposed of around maintenance plots. It is feared that it could become a path for the spread of disease-causing bacteria to other cultivation plots.
By implementing water and mud management at the bottom of the pond, the process of preventing the emergence of WFD can proceed in a sustainable manner. Not only improving the quality of cultivation in the pond itself, this method also has a positive impact collectively.
How to prevent this can also be applied in various business segments of the pond. In the application of pond water recirculation, this prevention method can be applied, both with monoculture and polyculture commodities with fish. Similarly, ponds that still apply conventional techniques.
