INFLUENCE OF SUBSTRATE ON HETEROTROPHIC FOOD PRODUCTION AND GROWTH OF LABEO FIMBRIATUS, BARBODES CARNATICUS AND MACROBRACHIUM ROSENBERGII
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Date
2021
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KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR
Abstract
In search of low cost aqua farming, a range of substrate based aquatic system has
been developed for both fin fish and shell fish culture which provides shelter and increases
the periphyton production as food and thereby increases the production. The present study
is aimed to assess the growth and survival of fish (Labeo fimbriatus, Borbodes carnaticus)
and shell fish (Macrobrachium rosenbergii) in a substrate based system for a period of six
months, where the sugarcane bagasse is used as a substrate for the growth of periphyton.
The experiment was divided in three treatments, T1 (only substrate), T2 (substrate + feed)
and T0 (control) with triplicates. At the end of the experiment, the growth results showed
maximum average weight in T2 (L. fimbriatus 141.17 ± 0.66; B. carnaticus 98.07 ± 1.16
and M. rosenbergii 73.95 ± 0.73) compared with T1 and T0 and there is a significant
difference (P<0.05) observed between the treatments, the survival percentage was observed
high in T2 (89.81 %) followed by T1 (85.19%) and T0 (83.33 %). The yield (Kg/ha) is more
in the T2 (932.65) than T1 (708.56) and T0 (728.89). Periphyton growth has influence the
water quality parameters viz., pH (6.73 - 8.17), dissolved oxygen (6.70 - 8.50mg/l). Low
concentration of Ammonia (0.068 - 0.140 mg/l) and Nitrite (0.046 - 0.082mg/l) was
observed in substrate based ponds. The chlorophyll-a concentration was high in periphyton
(0.25 - 3.97μg/cm2) than the plankton (0.58 - 2.64μg/l). The periphyton on substrate
increased the protein content of the fish and prawn carcass. The results of the experiment
showed that the use of sugarcane bagasse as a substrate not only helped for enhancement
of growth, survival and production of the fish and prawn but lowered the levels of toxic
NH3-N, NO2-N in water columns. Therefore this system is ecofriendly as limited water
exchange is carried in this system. Use of substrate reduces the feed quantity so this
technique is farmer’s friendly.