author(s)
Mahesh Kumar R, Narshivudu Daggula, Ashok Induri, Ganesh Guguloth, Yesu Das B, Suresh Kummari and Mohan Maloth

abstract
The usefulness of growth prompters and probiotics in maintaining water quality and thereby in enhancing growth rate and survival rate is described in the present investigation based on the efficacy of L. vannamei was fed with three different herbal powder of ginger, garlic and fenugreek of varying levels of 1%, 2.5%, 5%, 2%, 4%, 6%, 0.5%, 1% and 1.5% of concentrations respectively mainly to assess the optimal growth-promoting potential and survival rate. The feeding trial was continued for 63 days with triplicates in each treatment. The highest weight gain was observed in GP 4% supplemented diet fed vannamei compared to all other garlic supplemented diets. The survival rate of the vannamei fed diets containing garlic powder was significantly (P <0.01) higher in GP 6% (91.6%) compared to control (58%). A similar trend of elevated survival rates was noticed in vannamei at ZP 2.5 (91.3%) and FP 1.5% (83.3%) compared to control. The growth-promoting ability of herbs with varying concentrations higher in GP 4% followed by ZP 2.5% and FP 1% supplemented in vannamei diets.The result shows that herbs plays a vital role in growth, survival and disease resistance of the animal by maintaining good water quality parameters throughout the study period.