Imbalanced C/N - controlled, periphyton-based system has hampered tilapia growth in stagnant experimental tanks

Rafael Barroso Martins; Diego Alves do Vale; Vanessa Tomaz Rebouças; Marcelo Vinícius do Carmo e Sá

doi:10.4025/actascitechnol.v36i2.19515

Imbalanced C/N - controlled, periphyton-based system has hampered tilapia growth in stagnant experimental tanks

Rafael Barroso Martins Universidade Federal do Ceará
Diego Alves do Vale Universidade Federal do Ceará
Vanessa Tomaz Rebouças Universidade Federal do Ceará
Marcelo Vinícius do Carmo e Sá Universidade Federal do Ceará

DOI: https://doi.org/10.4025/actascitechnol.v36i2.19515

Abstract

The simultaneous use of periphyton and controlled C/N ratio of water may improve water quality and fish growth. The current assay investigated the interaction between periphyton and C/N ratio of water in rearing tanks with Niletilapia juveniles. The study was carried out in 20 outdoor stagnant 250-L tanks. A wooden structure for periphyton development was submerged in five of the tanks. A completely randomized 2 x 2 factorial mode design was employed to evaluate the following factors: (1) substrate for periphyton and (2) the C/N ratio of water. Dry molasses were applied weekly in the tanks to raise C/N ratio of water to 20:1. The addition of molasses to the culture water significantly lowered DO₂ and pH levels of water, and raised nitrite concentration. Fish stocked in the control tanks (no periphyton, no C/N ratio balance) attained a final body weight significantly higher than those observed for other treatments after 6 weeks of culture. In spite of the correction of C/N ratio of water to 20: 1, low DO₂ concentrations avoided the suitable development of bioflocs.

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Author Biography

Marcelo Vinícius do Carmo e Sá, Universidade Federal do Ceará

Atualmente é Professor Adjunto da Universidade Federal do Ceará, aonde leciona as disciplinas "Limnologia" e "Fisiologia Aquática" (Graduação); "Nutrição de organismos aquáticos cultivados" (Pós-Graduação). É pesquisador associado do Laboratório de Nutrição de Camarão (Centro de Estudos Ambientais Costeiros, Labomar/UFC, Eusébio, CE) e coordenador do Laboratório de Ciência e Tecnologia Aqüícola (CTA, Campus do Pici, Fortaleza, CE). Tem experiência na área de nutrição e alimentação artificial de peixes e camarões cultivados. Currículo Lattes

Published

2014-04-04

How to Cite

Martins, R. B., Vale, D. A. do, Rebouças, V. T., & Sá, M. V. do C. e. (2014). Imbalanced C/N - controlled, periphyton-based system has hampered tilapia growth in stagnant experimental tanks. Acta Scientiarum. Technology, 36(2), 229-235. https://doi.org/10.4025/actascitechnol.v36i2.19515

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Issue

Vol 36 No 2 (2014)

Section

Fishery Engineering

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