Salmon are capable of spawning multiple times a year. Peng Zeyu, which has already spawned in spring and summer, will undergo another round of breeding in the autumn after being intensively raised. After receiving an oxytocin injection, a large number of squid are placed into large pools (1 to 3 mu) to maintain a steady water flow, enabling synchronized spawning within 3 to 5 days, resulting in a high fertilization rate. The fertilized eggs hatch naturally in Dachi, making the process simple and efficient with a high hatching success rate. These fry can also be raised and sold according to farmers' needs. After autumn breeding, the eel fry is cultivated and by the following spring, they grow into fish measuring 3 to 5 cm in length. This species is in high demand, offering good economic returns.
For broodstock selection, individuals that have already spawned in spring and summer and weigh over 400 grams are chosen. To ensure successful reproduction of Pengze squid, these broodstock must be intensively cultured. Each broodstock area should be 2 to 3 mu with a water depth of 1.5 to 2 meters. Stocking density is around 300 to 400 kg per mu. A formulated feed with approximately 30% protein is used, with daily feeding amounts ranging from 3% to 5% of the fish’s body weight, adjusted based on their feeding conditions.
Although P. praecox can spawn naturally in autumn, the timing is not consistent. To obtain large quantities of autumn squid, artificial oxytocin is necessary. The breeding season for Peng Zeyu typically runs from late September to mid-October, with water temperatures below 30°C. Artificial spawning involves determining the number of broodstock needed based on fry requirements—usually 10,000 to 20,000 fry per female. Selected broodstock are injected with LRH-A plus DOM, with a male-to-female ratio of 2:1 or ideally 1:1. After injection, the broodstock are returned to the original pond or moved to a new one of 1,000 to 2,000 square meters designated as a spawning pool.
Once injected, the broodstock can spawn naturally. Typically, a small number of eggs are laid on the second day after injection, while the majority are laid on the third and fourth days, achieving a fertilization rate of over 85%. Fish nests are hung in the spawning pool and replaced promptly as spawning progresses to avoid overcrowding. The spawning pool should have micro-flowing water for optimal conditions.
When the water temperature is high during autumn hatching, salmon eggs can be directly placed in the fry pool. Fry ponds are usually 1,000 to 2,000 square meters with a water depth of about 1 meter. Each pond can hold 500,000 to 1 million eggs, and the pond should be cleaned thoroughly to ensure fresh water and prevent wild fish from entering. When the water temperature is between 27°C and 28°C, soymilk can be fed to the fry starting on the third day. In large ponds, the hatching rate can exceed 90%, ensuring a successful and profitable breeding cycle.
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