EFFECT OF POLYHERBAL COMPONENTS ON GROWTH, SURVIVAL, IMMUNE RESPONSE AND DISEASE RESISTANCE IN WHITE LEG SHRIMP Litopenaeus vannamei
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Date
2019
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KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR.
Abstract
effect of polyherbal components on growth, survival, immune response and
disease resistance in white leg shrimp Litopenaeus vannamei was assessed in indoor
circulatory aquaculture system, which was tested for 60 days. For this study, 0.5 g/kg feed
vitamin C (G1), 1.5 g/kg feed vit C (G2), 0.5 g/kg vit C and 1 g/kg polyherbal components
(PHC)(G3), 0.5 g/kg each vit C and PHC (G4), 1 g/kg vit C and 0.5 g/kg PHC (G5) and 0.75
g/kg each vitamin C and PHC g/kg of feed (G6), supplemented diets were prepared and fed
to shrimp. The growth performance of shrimp was assessed during the 15th, 30th, 45th and
60th days of feeding experiment. It showed that shrimp fed on G6 diet ex better growth
performance such as SGR (0.55 ± 0.003%), the mean weight gain (18.70 ± 1.05g) and food
conversion ratio (1.7 ± 0.0002) during the 60th day of feeding experiment, where highest
survival was seen in G6 (86.66%). Immunological parameters such as total haemocyte
count (284.0 × 105 cells/ml), superoxide anion activity (0.310 ± 0.02 O.D), phenoloxidase
activity (0.15 ± 0.0002 O.D) were higher in shrimp fed diet G6 at the end of 60th day of
feeding experiment. G6 group showed 60% survival when treatment diet fed shrimps were
challenged against WSSV, while control diet fed shrimps had total mortality. The result
inferred that the polyherbal components and vitamin C in combination at a concentration
of 0.75 g/kg feed served as a potent growth promoter and immune modulator in shrimp,
L. vannamei.