论文部分内容阅读
研究了不同浓度头孢氨苄(Cefalexin)对斑节对虾Penaeusmonodon幼体发育以及对斑节对虾育苗水体中异养菌总数和弧菌数量的影响。在试验初期,无论是对照组还是施用头孢氨苄的各试验组,育苗水体中的总异养菌数量和弧菌数量都呈现出较为明显的上升趋势;在第二次施用头孢氨苄后,各试验组的异养菌总数和弧菌数量的增幅明显低于对照组(或出现异养菌总数和弧菌数量缓慢下降),而对照组异养菌总数和弧菌数量则呈现显著的上升。施用0.5～1.0μL·L-1头孢氨苄对育苗水体中的总异养菌有显著的杀灭及抑制作用,但对弧菌数量杀灭及抑制作用并不显著;施用1.5μL·L-1头孢氨苄对育苗水体中的总异养菌和弧菌数量的杀灭及抑制作用显著。当幼体变态发育至仔虾第8天(P8)时,对照组异养菌总数和弧菌数量分别达6.33×105和3.55×104CFU·mL-1,均远远高于试验组的异养菌总数和弧菌数量增长的幅度。试验组的幼体变态到P1期的时间,比对照组缩短了10h以上;试验组的成苗率也比对照组提高了3.2%～13.1%。
The effects of different concentrations of Cefalexin on Penaeus monodon larval development and the number of heterotrophic bacteria and Vibrio in Penaeus monodon were studied. At the beginning of the experiment, the total number of heterotrophic bacteria and the number of Vibrio in the nursery water showed a more obvious upward trend, no matter in the control group or the experimental groups administered with cephalexin. After the second cefalexin treatment, The increase of the total number of heterotrophic bacteria and the number of vibrios in the group was significantly lower than that of the control group (or the number of heterotrophic bacteria and the number of vibrious bacteria decreased slowly), while the number of heterotrophic bacteria and Vibrio spp. In the control group showed a significant increase. The application of 0.5-1.0 μL · L-1 cephalexin significantly inhibited and killed the total heterotrophic bacteria in the water of seedling raising, but did not kill or inhibit Vibrio vulnificus in any significant amount. 1.5 μL·L-1 Cephalosporin on the nursery water in the total heterotrophic bacteria and Vibrio killing and the number of significant inhibitory effect. When the larvae metamorphosed and developed on the eighth day of larvae (P8), the total number of heterotrophic bacteria and Vibrio in the control group reached 6.33 × 105 and 3.55 × 104CFU · mL-1, respectively, which were much higher than that of the heterotrophic bacteria The increase in the total number and the number of Vibrio bacteria. The larvae of the experimental group metamorphosis to the P1 period, shortened more than 10h than the control group; the seedling formation rate of the experimental group was also increased by 3.2% ~ 13.1% than that of the control group.