Abstract
AEI Aquaculture Environment Interactions Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections AEI 11:279-290 (2019) - DOI: https://doi.org/10.3354/aei00311 Effects of the algicidal bacterium CZBC1 on microalgal and bacterial communities in shrimp culture Xiaojuan Hu**, Guoliang Wen**, Wujie Xu, Yu Xu, Haochang Su, Keng Yang, Yunna Xu, Zhuojia Li, Yucheng Cao* Key Laboratory of South China Sea Fishery Resources Exploitation and Utilization, Ministry of Agriculture and Rural Affairs; Key Laboratory of Fishery Ecology and Environment, Guangdong Province; South China Sea Fisheries Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, PR China *Corresponding author: cyc_715@163.com**These authors contributed equally to this work ABSTRACT: Algicidal bacteria may play a role in controlling algal blooms. Previously, a Bacillus cereus strain (CZBC1) was shown to have specificity against harmful Cyanophyta. To elucidate the characteristics of microalgal and bacterial communities in shrimp culture associated with the algicidal bacterium CZBC1 and its combined use with the addition of organic carbon, we established a shrimp culture system in which the dominant macroalgal species were Oscillatoria chlorina (Cyanophyta) and Chlorella pyrenoidosa (Chlorophyta). We studied water-column microalgal and bacterial communities in control (GC), bacteria (GB), and bacteria-carbon (GBC) treatment groups at the mid-point (Day 28) and end (Day 56) of the experiment. The algicidal bacterium CZBC1 was able to regulate abundance of Cyanophyta on Days 28 and 56 in GB and GBC. Abundances of Cyanophyta on Days 28 and 56 ) in GB (<0.44%) and GBC (<0.37%) were significantly lower than that in GC (25.58 to 40.87%), and those of Chlorophyta in GB (86.83 to 92.85%) and GBC (99.63 to 99.94%) were significantly higher than those in GC (52.52 to 67.35%). Multiple linear stepwise regression analysis showed that the amount of applied algicidal bacterium CZBC1 had the most significant negative correlation with the abundance of Cyanophyta (R = 0.973, p < 0.01). On Days 28 and 56, the average well color development value (Biolog), bacterial count, and bacterial community structure were relatively stable in GB, while the addition of a carbon source increased the amount of bacteria and affected the composition of the bacterial community in GBC. Our findings suggest that algicidal bacteria can be used to regulate microalgal communities and stabilize the metabolic potential of bacterial communities in aquaculture. KEY WORDS: Algicidal bacteria · Dominant species of microalgae · Bacterial communities · Carbon source · Cyanophyta Full text in pdf format PreviousNextCite this article as: Hu X, Wen G, Xu W, Xu Y and others (2019) Effects of the algicidal bacterium CZBC1 on microalgal and bacterial communities in shrimp culture. Aquacult Environ Interact 11:279-290. https://doi.org/10.3354/aei00311 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AEI Vol. 11. Online publication date: June 27, 2019 Print ISSN: 1869-215X; Online ISSN: 1869-7534 Copyright © 2019 Inter-Research.
Highlights
Developing a stable and favorable microalgal community (Chlorophyta or Bacillariophyta) is important for the aquatic environment, for maintaining good water quality (Primavera 1993, MullerFeuga 2000) and ensuring optimal growth and survival of aquaculture animals (Burford 1997)
Our findings provide useful information regarding the impact of the algicidal bacterium CZBC1 and its combined use with carbon sources on microalgal and bacterial communities
Higher survival, final weight, and growth rate were observed in GBC and GB than in GC (p < 0.05), while significantly lower feed conversion ratio (FCR) was observed in GBC and GB compared to GC (p < 0.05), as the same amount of feed was provided to each group every day
Summary
Developing a stable and favorable microalgal community (Chlorophyta or Bacillariophyta) is important for the aquatic environment, for maintaining good water quality (Primavera 1993, MullerFeuga 2000) and ensuring optimal growth and survival of aquaculture animals (Burford 1997). Cyanophyta are less desirable than Chlorophyta or Bacillariophyta (Boyd 1989), because excessive growth of Cyanophyta may result in toxins that are harmful for aquaculture animals and with respect to seafood safety for humans (Niedzwiadek et al 2012, Harke et al 2016). Many researchers have shown that algicidal bacteria can control harmful algae and regulate the microalgal biomass of red tide species (Imai et al 2001, Mayali & Azam 2004, Sun et al 2016). The application of algicidal bacteria in aquaculture has not been extensively studied
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