One of the key uses of quicklime in aquaculture is as a water conditioner. Pond water can easily become acidic or deteriorate over time, which can negatively impact aquatic life. To improve water quality, a solution of 15 to 20 ppm of quicklime is often applied. This helps balance the pH and creates a healthier environment for aquatic organisms. It's also common practice to regularly sprinkle lime solution into ponds housing crustaceans like shrimp or crabs. This not only enhances calcium levels in the water but also supports the development of their exoskeletons. The best time to apply lime is during sunny afternoons when the sun is strongest.
The second application of quicklime is as an anti-mold agent. Many aquaculture feeds, especially those made from straw, are prone to mold if stored for too long. By adding a small amount of quicklime to the feed, you can make it more alkaline, which inhibits the growth of harmful microorganisms and extends the shelf life of the feed. Typically, about 0.8 kg of quicklime per 100 kg of straw feed is sufficient for effective mold prevention. Before feeding, it’s important to rinse the feed with water to remove any residual lime.
Another use of quicklime is as a filler for pond culverts. When pipes are installed in ponds, gaps around them can lead to leaks or even allow animals like crabs to escape. Quicklime mixed with clay can be used to fill these spaces. Once set, it hardens into a solid, gray block that prevents water loss and keeps aquatic animals secure. This method is particularly useful in crab farming, where crabs have a tendency to dig and escape through small openings.
Quicklime is also widely used as a disinfectant in aquaculture. It's a common practice to clean ponds using lime. There are two main methods: one involves filling the pond with water up to 40–50 cm deep and then applying 100 kg of fresh lime per acre. After the lime dissolves, it is spread around the edges of the pond. The other method is dry pond cleaning, where 75–100 kg of lime per acre is evenly distributed on the bottom and around the sides. This not only cleans the pond but also helps prevent the spread of diseases by reducing pathogen levels in the water.
Lastly, quicklime serves as a desiccant during the rainy season. Feed stored in wet conditions is at high risk of spoilage. To protect it, a layer of quicklime is placed at the bottom of storage areas, followed by a breathable cloth. The feed is then stacked on top of this setup. This helps absorb excess moisture and keeps the feed dry and safe for consumption by aquatic animals.
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