施用芽孢杆菌对滩涂土池养殖凡纳滨对虾数量生长特性的影响

在粤西电白县滩涂土池对虾养殖区设置试验组（养殖过程每10d施用芽孢杆菌，用量103CFU/mL）和对照组（不施菌），养殖设施与其他管理相同，全程监测凡纳滨对虾（Litopenaeus vannamei）体长、体质量和主要水质因子的变化，研究芽孢杆菌对养殖对虾数量生长特性及生产效益的影响。结果显示，养殖对虾体长和体质量呈幂函数关系，Von Bertallanffy方程可较好拟合其生长关系，体长增长速度呈对数递减趋势，而体质量则为递增，日龄50d前的体长生长速率高于体质量的；试验组对虾的体长和体质量自日龄56d即超过对照组，收获虾的体长、体质量极显著增大，饲料系数降低了41.41%，产量提高了6.07%。结果表明，养殖过程合理施用芽孢杆菌可改善对虾的生长数量性状，降低饲料系数，提高养殖综合效益。

Effects of probiotics on growth characteristics of Litopenaeus vannamei under tidal shrimp culture

The shrimp (Litopenaeus vannamei) was semi-intensive cultured in ponds which were located in Dianbai, Guangdong,China, effects of probiotics on growth characteristics of shrimp were evaluated. The doses of probiotics (Baclicus lincheniformis) used in test group was 103 CFU/mL, every 10 days during the whole culture season, in control group but not. Shrimp growth parameters and water quality indices were tested every 7 and 14 days, respectively. The results showed that the fitting curves of shrimp growth could be well coincided with Von Bertallanffy equation. There was an opposite direction trend in growth velocity ratio between body length and weight,that of body length was logarithmic increment but body weight was logarithmic decrement, additionally, the growth velocity ratio of body length was higher than that of body weight before 50 day-old, the body length and weight in test ponds was over than that of control ponds since 56 day-old. Compared with control ponds, the feed coefficient of test ponds decreased 41.41%, output increased 6.07%, the average size of shrimp also was significantly bigger. Overall, the study indicated that probiotics could improve the growth characteristics of L.vannamei and reduce the feed coefficient under semi-intensive culture. Accordingly, the economic benefit of shrimp culture could be improved.