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A Preliminary Study on Artificial Seedling Techniques of Semi-slip Tongue Gills
In recent years, the artificial seedling and cultivation of semi-slip tongue locust have seen significant development in northern regions, particularly in Shandong Province. Researchers have been conducting extensive studies on the techniques involved in raising these seedlings. This article provides an overview of the key steps in the artificial seedling production process for the semi-slip tongue locust.
First, obtaining fertilized eggs is a crucial step. These eggs are typically sourced from domesticated wild broodstock that has been carefully bred under controlled conditions. By managing nutrition, water temperature, and light exposure, the gonads of the broodstock can be stimulated to mature. Once matured, the fish can either spawn naturally or through artificial insemination, resulting in high-quality fertilized eggs.
Next comes the seed cultivation phase. Water quality plays a vital role in this stage. The ideal water temperature should range between 22°C and 23°C, with a pH above 7.9, dissolved oxygen levels exceeding 4 mg/L, and a light intensity of approximately 200 to 500 lux.
For feeding, several organisms are commonly used, including rotifers, Artemia nauplii, Artemia, and compound feeds. Rotifers are introduced when the fry are between 3 to 20 days old, fed two to three times daily. The concentration starts at 5 cells/mL and gradually increases to 10 cells/mL as the fry grow. Artemia nauplii are used from day 12 to day 50, starting with 0.5 mL per day and increasing to 2 mL as the fry develop. After 45 days, Artemia is fed twice daily, with the amount adjusted based on the fry’s weight. Once the fry reach 4 to 5 cm in length, they are transitioned to compound feed, which is given once or twice daily at 2% to 3% of their body weight.
Water exchange is another critical aspect. A continuous flow system is used to maintain clean and fresh water. As the fry grow, the water exchange rate increases, reaching 150% to 200% by the time they reach the bottom of the tank.
To ensure cleanliness, siphoning is performed regularly to remove debris from the pool's bottom. Daily checks are conducted, and if there is a buildup of waste, siphoning is done more frequently, eventually becoming a daily task.
Maintaining an appropriate stocking density is essential throughout the growth cycle. Starting from hatching, the density is adjusted to reduce stress and improve survival rates. The initial density is around 5,000 to 10,000 per cubic meter, gradually reduced to 2,000 to 3,000 per cubic meter as the fish grow.
Disease prevention is also a major concern. Measures such as disinfecting workers and tools, maintaining proper stocking density, regular antibiotic baths, thorough cleaning of food organisms, and keeping the pool bottom clean are all important strategies to prevent disease outbreaks.
Lastly, one challenge observed during the cultivation process is the high mortality rate of fry during the transition from live food to compound feed. The exact cause of this issue remains unclear, and further research is needed to address it effectively.