liming in aquaculture and its effect and applications.pptx

this ppt conclude what is lime and its use in aquaculture ,effect of liming on water quality and PH, how we can calculate the lime requirement for pond according to PH of water

1. 2nd year 4th sem.

2. The Liming Effect on Pond Health Enhancing Water Quality and Nutrient Balance

3. Introduction • Liming is the process of adding calcium carbonate (limestone) or calcium oxide (quicklime) to ponds and lakes to adjust their pH levels. • It helps in maintaining optimal water quality by neutralizing acidic conditions. • Liming is a common practice in aquaculture to improve fish production and overall pond health.

4. Why PH is Important? • pH is a measure of acidity or alkalinity in a solution. • A pH 6.5 - 8.4 of is ideal for most aquatic organisms. • Acidic conditions (pH < 6.5) can harm fish, reduce nutrient availability, and promote undesirable algae growth. • Liming raises pH levels towards a more basic range, creating a healthier environment for aquatic life.

5. Liming effects • It corrects acidity of soil and water. • Decomposes bottom organic matters. • It raises the the bicarbonate content. • Lime form the buffer system in water preventing the wide fluctuation of PH. • Its counteract is to remove the poisonous effect of excess of magnesium, potassium and sodium ions. • It fixes the harmful inorganic acid. • Lime by its toxic and caustic action, kills bacteria as well as fish parasites in their various life history stages and may render the fishes less liable to disease

6. Liming Methods • Lime can be applied to the pond bottom or add to the water at the inlet or spread on the surface of water. • The optimum quantity of 350 to 500 kilogram/ hectare lime needed to rectify the slight acidic condition of perennial ponds Dose of the lime has to be decided based on the PH of water. PH of water Doses of lime( kg/hect.) 4.4 - 5.0 4.5 - 5.5 5.5 - 6.5 6.5 - 7.5 1000 700 500 200

7. Calculating Lime Requirement • Lime requirement depends on the pond's acidity, size, and water volume. • Use water testing kits to measure pH and determine the required amount of lime. • Consult a professional or use online calculators to ensure accurate lime application. • Applying the correct amount is crucial to avoid under or over-liming.

8. Liming Risks and Limitations • Over-liming can be harmful to sensitive aquatic species and upset the ecological balance. • Liming might not effectively control algae if other nutrient imbalances or excessive sunlight are present. • Cost considerations: Liming can be expensive, especially for large ponds, necessitating budget planning. • Environmental factors: Liming may not be suitable for ponds with high natural alkalinity or specific water chemistry.

9. Conclusion • The liming effect in ponds offers numerous benefits by improving water quality, nutrient balance, and fish health. • Proper liming practices can lead to increased biodiversity and a thriving aquatic ecosystem. • By understanding the importance of pH and applying appropriate liming techniques, pond owners can enhance the overall sustainability of their water bodies.