Effects of Photosynthetic Bacteria-enhanced Biological Floc Replacement Diets on Tilapia Growth,Water Environment and Water Microbial Diversity

• 作者: Dandan LI Jiazhang CHEN Limin FAN Liping QIU Lu QIN Xinxu DONG Yuanyuan DONG
• 来源期刊: 农业生物技术:英文版
• 学科: 化学
• 关键词: Photosynthetic bacteria Biological floc Bait substitute Microbial community TILAPIA
• 年，卷（期）: nyswjsywb_2020,（5）
• 页码范围: 73-79
• 页数: 7页
• 分类号: O62

摘要

With Oreochromis niloticus as the object of study,glucose was added as a carbon source to promote the formation of the biological flocs for replacing part of the feed,and three gradients were set up,namely Group A(all feed),Group B(replacement of 10%feed)and Group C(replacement of 20%feed),so as to explore the effects of photosynthetic bacteria-enhanced biological flocs on tilapia growth and water environment conditions.Meanwhile,the Biolog-ECO technology was applied to study the changes of microbial carbon metabolism diversity in aquaculture water.The results showed that the utilization of microbial carbon sources under different feed replacement gradients increased with the extension of the culture time.The overall performance was in order of 10%replacement>all feed>20%feed replacement.A suitable replacement rate could not only enhance the overall utilization of carbon sources by water microorganisms,but also save culture costs.The principal component analysis showed that the carbon source metabolism of the water microbial communities under different feed replacement gradients was significantly different.Specifically,polysaccharides,esters and amino acids were the preferred carbon sources of water microbes,while the utilization of amines and acids was low.