One of the key uses of quicklime in aquaculture is as a water conditioner. Aquaculture ponds often suffer from acidic or deteriorating water quality, which can negatively impact aquatic life. To address this, applying a solution of 15-20 ppm of quicklime can help balance the pH and improve the overall water environment. This practice not only enhances water clarity but also supports better conditions for aquatic organisms. It's typically recommended to apply lime during sunny afternoons when the sun is strongest, as this helps the solution disperse more effectively.
Another important application is as an anti-mold agent. Many aquaculture feeds, especially those made from straw, are prone to mold if stored for too long. Adding a small amount of quicklime to the feed can make it slightly alkaline, which helps inhibit the growth of harmful microorganisms. For example, mixing 0.8 kg of quicklime into 100 kg of straw feed can significantly reduce the risk of mold. Before feeding, it's essential to rinse the feed thoroughly with water to remove any residual lime, ensuring the animals receive safe and clean food.
Quicklime is also used as a filler in pond culverts. When pipes are installed in ponds, gaps around them can lead to leaks or even escape of aquatic animals. By mixing quicklime with clay and filling these gaps, a hard, solid block forms over time, preventing water loss and keeping animals secure. This is particularly useful in crab farms, where crabs tend to dig holes and may escape through even the smallest openings.
As a disinfectant, quicklime is widely used to clean ponds before stocking. There are two common methods: one involves maintaining a water depth of 40-50 cm and then applying 100 kg of fresh lime per acre, followed by pouring the slaked lime solution around the edges. The other method is dry pond treatment, where 75-100 kg of lime is spread evenly across the pond bottom and surrounding areas. Quicklime not only cleans the pond but also helps control pathogens, reducing the risk of fish diseases and promoting a healthier aquatic environment.
Lastly, quicklime serves as a desiccant, especially during the rainy season when feed tends to get damp. To prevent moisture damage, a layer of quicklime can be placed at the bottom of storage areas, covered with breathable cloth, and then the feed is stacked on top. This method effectively absorbs excess moisture and keeps the feed dry, ensuring its quality and safety for consumption.
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