Consequential study on different levels of C/N ratios used in biofloc-based aquaculture system.

K Tayyab,S Aslam,A Hussain,A S Abbas,M A Ghauri

doi:10.1590/1519-6984.248878

Abstract

Biofloc technology is much highlighted these days because of its tremendous effects on aquaculture. Microbes were enriched on cheapest organic carbon source i. e., powdered banana peels and were incorporated in different aquaria rearing grass carp fingerlings under different C/N treatments (10:1, 15:1 and 20:1) and 10% water daily water exchange. The initial growth of fingerlings was recorded. The experiment was settled in triplicates for 60 days and run parallel to control group provided with commercial feed and daily water exchange. Its effect was evaluated by measuring the growth of fingerlings and water parameters of each aquarium. The average % gain in weight and length of fingerlings was obtained significantly highest (28.12 ± 0.30g and 17.29 ± 0.46cm respectively) in aquaria containing pure powdered banana peels with 10% water exchange and C/N ratio was adjusted at 20: 1 (T3) than other treatments and control. Ammonia and other water parameters were also under control in T3 than other experimental and control groups. By all counts, it was concluded that the highest C/N ratio in biofloc system had the potential to increment C. idella growth rate by reducing toxicity and could be used as fish meal substitute.

Highlights

Biofloc is a protein rich system in which different microorganisms are combined together in an organic matrix, helpful in improving water quality, waste treatment and disease prevention in aquaculture
The nitrogenous waste is being converted by microorganisms into usable nitrates which are assimilated as their protein part
The research study was executed to assess the outcomes of carbon to nitrogen ratio (C/N ratio) adjusted at different levels in biofloc based aquaculture system

Summary

Introduction

Biofloc is a protein rich system in which different microorganisms are combined together in an organic matrix, helpful in improving water quality, waste treatment and disease prevention in aquaculture. The microorganisms in the system utilize the provided carbon source and nitrogenous wastes excreted by fish. Biofloc recycles the nutrients in water and aggravates growth rate, feed conversion ratio and weight gain in shrimps and tilapa (Burford et al, 2004; Wasielesky Junior et al, 2006), biofloc technology. Molasses were used for tilapia rearing by Widanarni et al (2012) (C/N ratio of 15:1) and Lima et al (2015) (C/N ratio of 6:1)

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