

FOLLOWUS
1.College of Animal Sciences, Zhejiang University, Hangzhou 310058, China
2.College of Aquaculture, Wonsan Fisheries University, Wonsan 999093, DPR Korea
3.College of Life Science, Kim Hyong Jik University of Education, Pyongyang 99903, DPR Korea
4.Zhejiang Mariculture Research Institute, Wenzhou 325005, China
zjm-9630@163.com
guangxu_liu@zju.edu.cn
Received:24 December 2021,
Published:01 May 2023
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JU Kwangjin,KIL Myongsuk,RI Sanghyok,et al.Impacts of dietary supplementation of bamboo vinegar and charcoal powder on growth performance, intestinal morphology, and gut microflora of large-scale loach Paramisgurnus dabryanus[J].Journal of Oceanology and Limnology,2023,41(03):1187-1196.
Although accumulating data demonstrate that dietary supplementation of bamboo vinegar and charcoal powder (BVC) can significantly strengthen the immunity and boost the growth of domestic animals
its application potency still awaits verification in commercial fish species such as the large-scale loach
Paramisgurnus dabryanus
. The impacts of 90-day dietary supplementation of 1% and 2% BVC on survival and growth performance of the loach
and on t
he intestinal morphological characteristics and gut microflora were analyzed. Our data show that the large-scale loach supplied with BVC at the experimental doses had significant higher survival rates and better growth performance (indicated by greater weight gain (1.13–1.14 times)
higher specific growth rate (1.04 times)
and lower feed conversion ratio (0.88–0.89 times)) compared to that of the control (
P
<
0.05). Histological examination revealed significant longer villus (3.22–5.54 times)
deeper crypt (1.77–1.87 times)
and thicker muscle (1.59–3.17 times) in the intestines of large-scale loach fed with BVC (
P
<
0.05). Furthermore
we found that the gut microflora consisted of significantly fewer proportions of potential pathogenic bacterial species (
Aeromonas veronii
and
Escherichia coli
)
but significantly greater proportions of beneficial microbes (
Lactococus raffinolactis
and
Faecalibacterium prausnitzii
). Therefore
dietary intake of BVC can promote intestinal tract development and optimize gut microflora
by which the survival and growth of large-scale loach may be improved.
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