Luminous bacterial flora of penaeid shrimps and their environs in
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Authors
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T Jawahar Abraham
Fisheries College and Research Institute, Tamil Nadu Veterinary and Animal Sciences, University, Tuticorin-628 008, India
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S A Shanmugam
Fisheries College and Research Institute, Tamil Nadu Veterinary and Animal Sciences, University, Tuticorin-628 008, India
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K Dhevandran
Department of Aquatic Biology and Fisheries, University of Kerala, Thiruvananthapuram - 695 007, India
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R Palaniappan
PG Department of Microbiology, Sri Paramakalyani College, Alwarkurichi - 627 417, India
Abstract
The association and species composition of luminous bacteria in semi-intensive grown penaeid shrimp of both seawater and
brackishwater fed shrimp culture systems were studied. Luminous bacterial counts of pond water, pond sediment and shrimp
increased with days of culture in both systems. Although the proportion of luminous bacteria in the total viable population
increased in all the samples, the quantum and rate of increase were comparatively low in brackishwater shrimp pond samples
A salinity dependant distribution of luminous bacteria was observed in brackishwater ponds. Quantitatively, five species of
luminous bacteria, viz.,
Photobacterium leiognathi. Vibrio fischeri, V. harveyi, V. orientalis, and V. splendidiis
biotype 1 were
encountered in seawater fed ponds.
Vibrio harveyi
was the dominant species, comprising about 80.00-92.30% of the total
luminous population.
Photobacterium leiognathi and V. fischeri
were absent in sediment samples. In brackishwater ponds,
P. leiognathi, V. harveyi
Â
and V. splendidus biotype 1 were isolated, only in water samples, with the dominance ofV. harveyi.
Sediment samples had
V. harveyi alone; while in shrimp, P. leiognathi
was absent. The results in general revealed that the
luminous bacteria are part of the autochthonous flora of the eutrophic shrimp farm environment as in marine environment,
which increased with period of culture.
