study of seasonal variation in bacterial flora concomitant with farm raised
fingerlings of Cyprinus carpio
tarai region of Uttarakhand
U.P. Singh1 and N.N. Pandey2
Fisheries, G.B.Pant University of Agriculture and Technology, Pantnagar-263
Coldwater Fisheries Research, Bhimtal-263 136, India
Author E-mail: firstname.lastname@example.org
14 March 2012
12 October 2012
31 July 2013
bacterial infection is an important economic and limiting factor in intensive
fish production. The present study focuses on investigation of the bacterial
population associated with farmed common carp fingerlings, its environment
and limnological quality of pond, during winter and summer season. It was
found that the bacterial count in the pond sediment (6.40 cfu x 104)
was about 10 times higher in comparison of pond water (6.93 cfu x 103).
Further, the intestinal bacterial count was about 100 times higher (6.67 cfu
x 105) during winter and 1000 times higher (2.33 cfu x 106)
during summer season in comparison to the surfacial skin of fish during
winter and summer (3.39 and 8.87 cfu x 103), respectively. The
isolated bacteria were both Gram negative and Gram positive, mostly aerobic
rods. Furthermore, the temperature showed a significant relation with the
bacterial counts of pond water. In the summer season, higher bacterial counts
(8.72 cfu x 103) were recorded as compared to winter (5.13 cfu x
103). The dominant bacteria isolated from the sample of pond
water, pond sediment and fish were identified as Aeromonas hydrophila,
Pseudomonas fluorescens, Pseudomonas sp., Flavobacter sp.,
Bacillus sp., Micrococcus sp., Corynebacterium sp.
Moreover, the bacterial density was dependent on C:N values, and the optimum
range of C: N ratio was found between 16-23, for the carp culture ponds.
Among the isolated bacterial flora, the presence of strains which were well
known for their probiotic properties suggested an autochthonous source for
use in aquaculture. Further, analysis of various physico-chemical parameters
of pond water revealed that they were within the suitable range for the
freshwater fish culture throughout farming phase.
flora, Cyprinus carpio fingerlings, C:N values, Seasonal variation
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