During the high-temperature season, water quality can change rapidly due to elevated temperatures. It's essential to monitor it regularly and make necessary adjustments promptly. Here are some effective methods: First, replace 15 to 20 centimeters of water every 3 to 5 days to maintain good water conditions. Second, aquatic plants may wither quickly in the heat—remove any dead vegetation promptly to keep the environment clean and suitable for crayfish. Third, apply microbial preparations periodically, ideally once every 10 to 15 days, to enhance water quality. Lastly, ensure that the water clarity remains at 40 cm or more, which helps maintain a healthy environment.
Feeding during this period requires careful management. Freshwater crayfish tend to burrow and avoid the heat, reducing their daytime activity. Therefore, it’s best to control the amount of food given each day, ensuring there is just a slight residue after two hours. Feeding should primarily occur in the evening, as feeding in the morning may not be effective.
Water conservation is crucial during hot weather, as crayfish eat less and seek shelter in caves, which can affect their growth and harvestability. To counter this, it's important to maintain a sufficient coverage of aquatic plants in the pond—ideally covering 1/2 to 2/3 of the water surface. If plant density is low, consider transplanting water peanuts around the pond. Before planting, wash the peanuts thoroughly and disinfect them using a 20 mg/l potassium permanganate solution to eliminate any unwanted fish eggs or pathogens.
Harvesting freshwater crayfish is typically done using traps. Once the traps are set, encourage crayfish to move by creating gentle water currents. This increases their activity and improves catch rates. Also, take advantage of their feeding habits by stopping feeding for 1 to 2 days before harvesting. Use strong-smelling baits like fish or fragrant materials inside the traps to attract the crayfish effectively.
In ponds where catching is challenging, first assess the population density. If there are many crayfish, try adjusting the water level. Lower the water by half, place traps properly, increase the number of cages, and then gradually refill the water. This method stimulates the crayfish, increasing their movement and likelihood of entering the traps, thus significantly improving fishing efficiency.
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