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The technical mode of holding cages in cages
The majority of yellow fins currently available in the market are wild-caught. From November to March, these crickets hibernate, causing a significant drop in supply and a sharp decline in prices. During this off-season, the price can be several times lower than during peak months. However, if you manage to acquire them at a low cost during the peak season, you can store them temporarily and sell them later for a good profit. With proper cage farming techniques, the net profit per square meter can reach up to 100 yuan. The controlled environment ensures sufficient oxygen, promoting rapid growth and high yield. Moreover, they can be harvested and sold anytime during winter, making this one of the most efficient methods for raising astragalus.
First, setting up the cages: Use polyethylene mesh with a 36-count specification, creating rectangular cages measuring 20-30 square meters. Standard dimensions are 8m x 3m x 1.2m or 10m x 3m x 1.5m. These open-style cages should have mesh-covered openings to prevent escape. Place them in fish ponds with water depth of at least 1.5 meters, where the water clarity is between 25-30 cm. The cages should be set in place 7-10 days before introducing the astragalus. The bottom of the cage should be 0.5 meters above the pond floor, while the top should be 0.4 meters above the water level. The total cage area should not exceed 1/10 of the pond’s surface area.
Inside each cage, 80-90% of the space should be filled with floating peanuts, providing shelter for the yellow fin inhabitants. This prevents the pupae from entangling, which could lead to disease and death. Additionally, 3-5 kg of loach should be introduced into each cage to help prevent entanglement by moving around freely.
Second, harvesting and preparing the seedlings: Wild yellow fins are caught using various methods like traps, hand-picking, or fishing. Only healthy individuals should be selected; those with severe injuries should not be raised. Before placing them in the cage, the seedlings should be soaked in 3-4% saltwater for 5-10 minutes. Avoid using those that appear weak or have pelvic issues. Place 1.5-2 kg of seedlings per square meter, ensuring each weighs over 50 grams.
Third, feeding and management:
1. Feed consists mainly of alfalfa, fly larvae, snail meat, small fish, and animal organs, supplemented with wheat flour, corn flour, and bean cake, along with some leaves and trace elements. Mixing method: Combine fresh live feed with the right amount of wheat flour, jade powder, a small amount of leaves, minerals, and vitamins. Carnivorous feed should make up 65%, with 35% live animals, plus some leaves. All ingredients are mixed into bait strips—minced meat combined with other components into a dough-like consistency, then pressed into 3-4 mm diameter, 3-4 cm long strips. They can be air-dried for use.
Newly introduced seedlings should not be fed for the first three days. Afterward, feed them with oyster meat, snail meat, etc. The feeding rate (daily feed as a percentage of total weight) should be 1-2%. Once they eat normally, gradually introduce wheat flour or other cost-effective materials. When water temperature is between 20-28°C, the maximum feeding rate is 5-8%, with live animals as the main food. If dry feed is predominant, the rate drops to 2-3%. In other seasons, it's 3-4% and 1-2%, respectively. Bait is placed on a feeding tray made of wooden strips and mesh cloth (0.6m x 0.4m x 0.1m), fixed 20 cm below the water surface. Feeding usually starts in the early evening, gradually shifting to 5 PM. During the growing season, feedings occur at 9 AM.
2. Disease prevention: Any diseased individuals should be removed immediately. Each day, sprinkle a pink-colored potassium permanganate solution in the cage. Every 10-15 days, hang bags containing 100g of bleaching powder in each cage. Two to three bags per cage help disinfect the water. Additionally, add low concentrations of oxytetracycline to the bait, at 50 mg per kilogram of feed daily, to promote growth and reduce disease. Clean the cage once a month and adjust the density based on the size of the population.
3. Pest control: Rats are the biggest threat to the cages, often breaking them to escape. To deter them, place bundles of long hair around the cage perimeter—this has proven effective in reducing rat activity.