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Abstract
Aim:
The
study aimed to evaluate the growth and survival of two Indian major carps (Catla
catla, Labeo rohita) in diluted cattle farm wastewater to observe
the probability of recycling cattle wastewater in aquaculture systems.
Methodology: A sixty days
outdoor trial was conducted in cemented circular tanks.The cattle wastewater
was collected and treated with lime and potassium permanganate. After primary
treatment, the wastewater was diluted in the ratio of 50 (cattle wastewater):
50 (bore well water) and Lemna minor was inoculated for removing excess
nutrients. After secondary treatment, the fish were cultured in three
treatment groups viz., T0 -only bore well water; T1-
cattle wastewater: bore well water (20:80 ratio) prepared from secondary
treated dilution and T2- cattle wastewater: bore well water (50:50
ratio) to assess the performance of two Indian major carps.
Results: Catla
performed better than Rohu in terms of both survival and growth (P<0.05).
Rohu did not survive at the end of experiments in 50% diluted cattle
wastewater. The organoleptic score for odour was poor in 50% diluted
wastewater for both the species. The organoleptic score (odour) for T1 and T0
treatments did not differ significantly (P> 0.05).
Interpretation: The results
suggest that cattle shed wastewater can be recycled in aquaculture for
rearing major carps after treatment and making proper dilution. The diluted
wastewater efficiently enhanced the productivity, and reduced freshwater
demand and eutrophication in open waterbodies by removing nutrients from
wastewater.
Key
words:
Carp culture, Duckweed, Phytoremediation, Wastewater recycle
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