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Shrimp shellfish should pay attention to eight points
One major reason is the significant variation in environmental conditions across different areas, ponds, species, and even within the same shrimp pond. For example, shellfish can be found in various shrimp ponds, with some growing faster near the water inlet while others thrive closer to the outlet. In certain ponds, eutrophication becomes severe, leading to poor shrimp growth and even affecting shellfish, which may die off as a result. Therefore, it's important not to blindly follow others' polyculture experiences. Instead, we should implement polyculture in a scientific and tailored way based on our own specific conditions.
Second, selecting high-quality shellfish varieties is crucial. These species should be able to tolerate eutrophication, adapt to suitable temperatures, salinity ranges, and fluctuations in water temperature and salinity. They should also grow quickly and have high market value.
Third, the distribution of shellfish should be planned strategically for easier harvesting. It’s recommended to concentrate stocking in 15% to 25% of the total pond area. Considerations should include the pond’s productivity and ease of collection. Ponds with good water quality at the outlet should be seeded more densely, while those with poorer water quality should be seeded near the inlet.
Fourth, timely seedling stocking is essential. If possible, it's better to stock early, but spring seeding should be done after the shrimp have been fattened.
Fifth, managing the appropriate density of both shrimp and shellfish is vital. Larger ponds with higher shrimp densities often have greater primary productivity, allowing for higher shellfish stocking. Proper density helps maintain ecological balance and prevents water quality degradation.
Sixth, controlling the depth of the shrimp pond is important. While deeper water can increase shrimp biomass, it also leads to more organic matter settling at the bottom, reduced light penetration, and slower water flow, which negatively affects both shrimp and shellfish. Therefore, pond depth should be adjusted according to local conditions, not simply made as deep as possible.
Seventh, investing in additional aeration equipment is necessary. Currently, many Chinese shrimp farms rely on water exchange to address water quality issues, but this method can lead to loss of nutrients and productivity. Oxygen deficiency is often the root cause of water deterioration. By reducing excessive water exchange and adding aeration systems, water quality can be significantly improved, enhancing the overall ecological efficiency of the pond.
Lastly, consistent management and regular monitoring are key. Frequent inspections and sampling help track water quality and the growth of both shrimp and shellfish. Establishing routine measurement and recording procedures allows for early detection of anomalies, enabling prompt corrective actions and preventing potential losses.