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A Preliminary Study on Artificial Seedling Techniques of Semi-slip Tongue Gills
In recent years, the artificial seedling production and cultivation of the semi-slip tongue locust have experienced significant growth, especially in northern regions such as Shandong Province. Researchers and farmers alike have delved deeply into the techniques used to raise these seedlings, leading to improved efficiency and success rates. This article provides an overview of the key steps involved in the artificial seedling process for the semi-slip tongue locust.
First, obtaining fertilized eggs is a crucial step. These eggs are typically collected from domesticated wild broodstock that has been carefully managed under controlled conditions. By providing proper nutrition, regulating water temperature, and controlling light exposure, the gonads of the broodstock can be stimulated to mature. Once matured, the fish can spawn naturally or through artificial insemination, resulting in high-quality fertilized eggs.
Next comes the seed cultivation phase. Water quality is essential during this stage. The ideal water temperature should range between 22°C and 23°C, with a pH above 7.9 and dissolved oxygen levels exceeding 4 mg/L. Light intensity should be maintained around 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 2 to 3 times daily, gradually increasing the density from 5 to 10 cells/mL. Artemia nauplii are used from day 12 to day 50, starting at 0.5 mL and increasing to 2 mL as the fry grow. 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, compound feed is introduced, given once or twice a day at 2% to 3% of their body weight.
Water exchange is another important aspect. A continuous flow system is used to maintain clean water, with the exchange rate gradually increasing as the fry grow. By the time they reach the bottom, the water exchange rate should be between 150% to 200%.
Siphoning the bottom of the tank is necessary to remove waste and keep the environment clean. Workers should check the tank daily and siphon as needed, adjusting the frequency based on the level of contamination.
Maintaining appropriate stocking density is vital for the health and growth of the fry. From hatching to the final stages, the density must be adjusted regularly to reduce stress and improve survival rates. Initial densities can range from 5,000 to 10,000 per cubic meter, later reduced to 2,000 to 3,000 per cubic meter.
Disease prevention is also a critical component. Measures include disinfecting workers and tools, maintaining optimal density, regular antibiotic baths, thorough cleaning of food organisms, and ensuring clean water and a clean tank bottom.
Finally, one challenge encountered 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.
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