Other Medical Consumables,Medical Equipment,Medical Equipment Consumables,Medical Consumable Products Shandong Zhushi Pharmaceutical Group Co.,LTD , http://www.sdzs-medical.com
Intensive breeding techniques for autumn fish species
Fish species play a crucial role in achieving high yields and efficiency in aquaculture. The size and growth rate of fish directly affect their survival during the winter season. Autumn is a vital time for fingerling cultivation, and it's essential to focus on several key management tasks to ensure healthy development.
First, improving the water environment is critical for promoting fingerling growth. As fish grow and consume more food, the availability of natural food organisms in the pond decreases, while harmful substances accumulate, leading to poor water quality and lower dissolved oxygen levels. This can significantly impact smaller fish, which are less competitive and more vulnerable. To address this, regularly refreshing the pond water by replacing 1/3 to 1/2 of the existing water with fresh water helps maintain a healthier environment. Additionally, fertilizing the pond based on water conditions can boost the population of natural food sources. In early autumn, when temperatures are higher, chemical fertilizers like urea (2 kg per acre) and superphosphate (5 kg per acre) can be used. Fertilization should occur every 7 days. In late autumn, applying well-rotted organic manure (about 150 kg per mu) every 10 days is recommended. This helps maintain water clarity at 25–30 cm, ensuring that fish remain both healthy and active. Regular disinfection and proper feeding also help prevent diseases.
Second, adjusting stocking density and implementing grading rearing strategies is important. By selecting suitable weather conditions, fishermen can use nets to sort and separate small fish from larger ones. Larger fish can be moved to better-conditioned ponds, while smaller fish can be raised intensively. Different fish species can be cultured together, with carp making up about 5:1 ratio in mixed ponds. Stocking density depends on pond size, depth, water source, and fish size. For a pond 1.5 meters deep, around 2,500–3,000 fish over 15 cm can be stocked, while 3,000–4,000 smaller fish can be raised in the same area.
Third, rational feeding and fertilization are necessary to meet the nutritional needs of fish. Autumn is the best time for fish to eat more and grow faster. Feeding should be adjusted according to the main fish species. For grass carp ponds, feed should be provided so that fish consume about 80% of the daily amount. In other ponds, focusing on water fertilization and cultivating natural food organisms is key. A clear, cool, and lively pond environment supports better fish growth. Ponds with silver carp should also be fed crushed snails. After the autumn equinox, adding supplements like bran or wheat middlings can help maintain energy levels. It’s important to adjust daily feeding amounts to avoid waste and not to stop feeding too early.
Finally, enhancing overall management and disease prevention is essential. High water temperatures in autumn lead to rapid changes in water quality and increased organic matter accumulation, which can cause oxygen depletion. Autumn is also a peak season for fish diseases, especially before and after the White Dew period. Regular water changes, disinfection using lime or chlorine-based products, and feeding disease-prevention baits are all effective measures to protect fish health and promote growth.