Essential Oil,evening primrose oil,rose oil for skin,lavender body oil Xi'an Sentian Biotechnology Co., Ltd. , https://www.sentianbio.com
Green shrimp shrimp breeding techniques
Green shrimp, also known as *Fenneropenaeus chinensis*, are protandrous hermaphrodites, meaning that they start life as males and later change into females. A key distinction is that sexually mature males tend to be more robust than females, often reaching about 1.5 times the body length of their female counterparts. The spawning season for these shrimp in the middle and lower reaches of the Yangtze River typically occurs between April and September, with the peak spawning period falling between June and July. Spawning usually takes place in water temperatures above 18°C. After mating, female shrimp lay their eggs within 24 hours, carrying between 1,000 to 2,500 eggs. These eggs are oval in shape and form clusters attached to the female’s swimmerettes, which have bristles. The continuous movement of the swimming legs helps provide adequate oxygen, promoting successful hatching. The entire incubation period lasts approximately 22 to 25 days.
To prepare a breeding pond, it should have sufficient water supply, drainage, and irrigation systems, with no pollution. The ideal size is around 1 to 2 acres, with a water depth of 1 to 1.5 meters. Before use, any excess sludge should be removed, and the pond should be thoroughly cleaned using quicklime. Once the lime has fully reacted, the water should be filtered through an 80-mesh sieve before refilling with fresh water.
For broodstock selection, shrimp can be collected from breeding ponds or natural waters, ideally in early May. Broodstock should be at least 5 cm in length, with well-developed gonads or visible eggs, intact limbs, and good health. During non-breeding seasons, the male-to-female ratio should be maintained at 2:1 or 3:1, while during the breeding season, only females are moved to the breeding area.
When stocking broodstock, it's best to select those that already have eggs visible in their eyes, ensuring uniformity in shrimp size. Typically, about 10 kg of broodstock is placed directly into the breeding pool. Alternatively, they can be housed in mesh cages (100x70x50 cm) in shallow water. Selected berried shrimp are then placed into containers, with each container holding 0.5 g of shrimp per kilogram. After the eggs hatch, the broodstock is removed and sold.
During broodstock rearing, they are placed in the pond or cage and fed once daily. Their diet includes crushed snails, oyster meat, vegetable cakes, soybean meal, bran, and other animal and plant-based foods. The feeding amount should be 5% to 7% of the total weight of the broodstock. Feeding should continue until the food is completely consumed within 1–2 hours. Regular cleaning of the cages ensures proper water flow and maintains good water quality.
As the eggs develop and become transparent with visible eye spots, it indicates that the larvae are about to hatch. At this point, organic fertilizers such as fermented pig or cow manure can be applied to the pond to cultivate zooplankton like rotifers, cladocerans, and copepods, which serve as food for the shrimp larvae. Every 4–5 days, 100–150 kg of organic fertilizer per acre is added to maintain the population of natural feed. If zooplankton levels are low, the fertilizer amount can be increased, or 1.5 to 2 kg of soybean paste per acre can be added daily.
After about a month in the pond, the larvae undergo several molts and transform into juvenile shrimp. When their body length reaches approximately 1 cm, they can be transferred to grow-out ponds. Shrimp harvesting methods include using fine nets, light traps, or water traps to collect the young shrimp.