of cassava waste on bioremediation of
metabolites and shrimp growth
Lalitha*, M. Muralidhar, R. Saraswathy, P. Kumararaja? and A. Nagavel
Health and Environment Division, ICAR - Central Institute of Brackishwater
Aquaculture, Chennai-600 028, India
Author E-mail: email@example.com
received : 09.09.2015
received : 29.02.2016
received : 30.07.2016
Accepted : 09.11.2016
Aim: Locally available
cheap carbon sources, cassava waste and cassava starch, were tested for their
efficiency in decreasing the nitrogenous metabolites, resulting due to
accumulation of uneaten feed and excreta at the pond bottom during intensive
experiment was carried out in 500 l Fibre reinforced plastic (FRP) tanks for
a period of 105 days with four treatments viz., cassava waste, cassava
starch, cassava waste+ cassava starch and control, replicated thrice and
statistically randomized with Tiger shrimp, Penaeus monodon (1.71 g).
The following water quality parameters ? pH, salinity, dissolved oxygen (DO),
total ammonia nitrogen (TAN), nitrite nitrogen (NO2-N); microbial
parameters in water and sediment ? total heterotrophic bacteria count (THBC)
and total vibrio count (TVC); proximate composition, fibre fractionation,
carbon, hydrogen, nitrogen and sulphur content in cassava waste and cassava
starch were analyzed. The growth of shrimp was also studied.
growth was significantly high (p≤0.05) in cassava waste (11.12 g)
treatment followed by cassava starch (10.4 g), cassava waste + cassava starch
(9.8 g) and control (8.02 g) at the end of the experiment. Cassava waste,
cassava starch and combination of both significantly decreased the
concentration of metabolites and had high heterotrophic bacterial population
and low total vibrio count compared to control. ?
was concluded that addition of cassava waste had positive effect on
bioremediation of nitrogenous metabolites, enhancing the growth of shrimp.