Effect of molasses supplementation on growth performance, water quality and microbial dynamics during indoor rearing of pacific white shrimp Penaeus vannamei Boone, 1931
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Authors
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Sanjoy Das
ICAR- Central Institute of Brackishwater Aquaculture
http://orcid.org/0000-0003-1023-0777
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Debasis De
ICAR- Central Institute of Brackishwater Aquaculture
http://orcid.org/0000-0001-6062-2651
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Gouranga Biswas
ICAR- Central Institute of Fisheries Education
http://orcid.org/0000-0002-0847-3457
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Prem Kumar
ICAR- Central Institute of Brackishwater Aquaculture
http://orcid.org/0000-0003-0668-1794
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Christina Lalramchhani
ICAR- Central Institute of Brackishwater Aquaculture
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Sujeet Kumar
ICAR- Central Institute of Brackishwater Aquaculture
http://orcid.org/0000-0003-0653-2967
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T. K. Ghoshal
ICAR- Central Institute of Brackishwater Aquaculture
Abstract
A study was conducted with Pacific white-leg shrimp (Penaeus vannamei Boone, 1931) juveniles to ascertain the effect of
molasses supplementation on the growth performance, culture environment and microbial dynamics of rearing water. The
weight gain at the end of the experiment of 55 days duration were significantly (p<0.05) higher in molasses supplemented
group (12.08±0.45 g) as compared to control (10.44±0.34 g). Apparent feed conversion ratio (AFCR) was found significantly
(p>0.05) lower in case of molasses supplemented group with higher survival percentage. Supplementation of molasses also
improved the rearing water quality. The total ammonia nitrogen (TAN) level was significantly (p<0.05) lower in the rearing
water of molasses supplemented tank (2.213±0.165 ppm) compared to control (2.915±0.191 ppm). There was no significant
difference in total heterotrophic bacteria (THB) and total Vibrio (TV) load between the water of the two groups. However,
the proportion of TV to THB was significantly lower in case of molasses supplemented group as compared to control. This
study indicated that supplementation of molasses can significantly improve the growth performance of P. vannamei with
better feed utilisation and also improves the water quality by reducing the level of toxic gas i.e. ammonia in water.
Keywords: Ammonia, C:N ratio, Molasses, Vibrio