This study used indoor automatic shrimp culture system to improve production per unit and brood stock quality of Litopenaeus vannamei. Following are the significant results:
Growth Rates Higher in Shrimps in Upper Layers of Cages
After 4 months of culture, with a density of 20 mm-2, 1865 shrimp brood stock weighing over 35 g each were produced. Average weights of shrimps cultured on the upper layer of cage net were 38.22, 38.08, and 36.38 g, while those cultured on the bottom layers were 31.61 and 30.27 g. The average growth and survival rates of those on the upper layers were 0.105 g/day and 95.46%, respectively, which were slightly higher than the rate of those on the bottom layers, 0.072 g/day and 94.78%, respectively. Based on the results, it was concluded that indoor automatic culture system could increase production per unit and produce mass brood stock.
Examination of shrimp brood stock: a) Some shrimps are still under examination for healthy index and virology at the National Taiwan University (NTU).
Reproductive Capability of Shrimps
The reproductive capability of the shrimps produced was compared with the ones from the private hatcheries. The shrimps produced in this study had smaller sizes than the ones from the private hatcheries. However, they had similar GSI and sperm volume values.
Effect of Recirculation System
The effect of recirculation culture system and static culture system on reproduction of female shrimps was compared. Shrimps cultured under the former system had higher survival and reproduction rates than under the latter system.
The effects of the kind of feed on the reproduction of brood stock were also investigated in this study. Shrimps fed with worms had higher reproduction rates than those fed with hard clam flesh.
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