After the start of autumn, the weather gradually cools down. Although it's still challenging to completely eliminate the heat, there is still a "fall tiger" period. However, the overall trend shows that the daily temperature difference becomes more noticeable, with hot days and cooler nights. Autumn is a crucial season for aquaculture management. A single mistake can lead to significant losses or even undo all previous efforts. Below are some improved technologies and management practices to ensure a successful harvest:
**Water Quality Management:** As farmed species grow, the density in ponds increases, leading to the accumulation of leftover feed, waste, and decaying aquatic plants. These substances consume oxygen and release harmful gases like hydrogen sulfide, while also increasing ammonia levels and lowering pH, which can cause fish to float at the surface. It’s essential to perform regular water changes—small amounts frequently—to promote a diverse plankton population and prevent blue-green algae blooms ("blue lake water"). Additionally, using microbial agents such as Bacillus, photosynthetic bacteria, and EM bacteria can help regulate water quality by reducing nitrite, ammonia, and hydrogen sulfide levels. For crab ponds, gradually increase water exchange, avoiding sudden large changes. Every 10 days, apply lime (5 kg per mu) to maintain a pH between 7.8 and 8.5, with water clarity around 30–40 cm, which helps harden crab shells and supports healthy growth.
**Feeding Practices:** Improve feed quality for conventional fish, offering 5–6% of their body weight daily, with 60% being animal-based feed. For shrimp, feed should be 7–8% of their body weight. Crabs should have 65% animal feed, with daily feeding at 10% of their total weight. From early October, as water temperatures drop, reduce feed amounts gradually to 3–4% for fish, 4–5% for shrimp, and 4–5% for crabs. During early and mid-autumn, river crabs are in their peak feeding period for plants and snails, so ensure sufficient food supply. If pond vegetation is lacking, supplement with additional plants and snails. In soft-shell turtle farming, focus on maintaining good water quality to enhance appetite. Use water purifiers to quickly reduce ammonia and nitrite levels, then add beneficial microbes like photosynthetic bacteria after two days. This helps maintain stable and healthy water conditions. Adding 20% or less fresh or high-quality frozen fish slurry to feed improves protein and fat content, boosting turtle growth and fullness. To prevent enteritis, use natural remedies like andrographis or garlic for a few days.
**Disease Prevention and Control:** Historically, fish diseases tend to peak after the start of autumn. Proactive measures like "prevention before disease and early treatment when sick" can significantly improve outcomes. Combine external disinfection with internal treatments. Every 20 days, disinfect the entire pond using chlorine dioxide. Add detoxifiers, calcium, and oxytetracycline to feed once a month. For poor water quality or low aquatic plant coverage, consider the "kill first, then disinfect" method. Net fimbriae for shrimp and crabs, use trichlorfon for fish, and apply a mix of chemicals for combined species. After three to five days, sprinkle quicklime (5–10 kg per acre) and rice water. In late autumn, when cold air arrives, tropical species like white shrimp and Macrobrachium rosenbergii may suffer from sudden temperature drops, so prepare for cold protection and warming measures.
**Pond Monitoring:** Regularly patrol the ponds in the morning and evening to observe fish, shrimp, and crab activities, check feed intake, water color, transparency, and pH. Remove dead plants and leftover feed promptly, and clean feeding areas. For escape-prone species like river crabs and soft-shell turtles, inspect anti-escape structures and inlet/outlet systems. Strengthen security checks at night to prevent theft. Consistent monitoring ensures early detection of issues and better management outcomes.
Pelvic External Fixation
There are two kinds of external fixations for pelvic fractures, namely temporary fixation and therapeutic fixation.
Temporary fixation depends on on-site assistance. Assuming that the patient has serious open injury, severe hemorrhagic shock, and serious fracture dislocation, the rescue personnel will provide temporary external fixation support to maintain the stability of the pelvis, reduce secondary injuries, and correct the continuous aggravation of hemorrhagic loss on the scene. The therapeutic external fixation stent is used to correct the dislocation of the fracture through routine examination after admission, evaluation of the injury, and external fixation installation through treatment, maintain the relative stability of the fracture, create a very quiet environment for the fracture healing, and lay the foundation for the healing of the fracture. External fixation is an important method for pelvic fractures.
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