Effect of Orally Administered Vibrio Bacterin on Immunity, Survival and Growth in Tiger shrimp (Penaeus monodon) Grow out Culture Ponds

Abstract
Vibriosis is one of the important diseases causing economic loss to the shrimp industry worldwide. The present study reports field observations on the immune stimulatory effect of vibrio bacterin in commercial tiger shrimp (Penaeus monodon) grow out culture ponds (n=62) which were grouped under three stocking densities; low (6‐8 no.m−2), medium (9‐11 no.m−2) and high (12‐14 no.m−2). The bacterin was administered in feed as a top dressing at final concentration equivalent to 2x108 CFU kg−1 feed twice a week throughout the culture period. In twenty representative ponds total haemocyte count (THC) and prophenoloxidase (proPO) activity in shrimp were significantly (P<0.05) higher and anatomical deformities like, antennae cut (5.02±2.42), tail rot (5.10±1.74), rostrum cut (4.49±2.19) and soft shell (10.05±5.77) were significantly lower compared to controls in all the studied stocking densities. Significant (P<0.05) improvement in production parameters like survival and production (kg ha1) was observed in all treatment ponds while similar improvement in average daily gain (ADG) and feed conversion ratio (FCR) could be observed in groups with low and medium stocking densities. Results of the study suggest that, oral administration of vibrio bacterin improves the immunity, reduce anatomical deformities and enhances the production in commercial shrimp culture operations.

Source: Letters in Applied Microbiology - October 1, 2017 Category: Microbiology Authors: Arvind Kumar Ray, C. Gopal, H.G. Solanki, T. Ravisankar, P.K. Patil Tags: Original Article Source Type: research