Resumo

BURBANO-GALLARDO, Elizabeth et al. Effect of fish farming on sediments and the proliferation of nitrifying bacterial communities in Lake Guamuez, Colombia. Cienc. Tecnol. Agropecuaria [online]. 2021, vol.22, n.2, e1581.  Epub 01-Maio-2021. ISSN 0122-8706.  https://doi.org/10.21930/rcta.vol22_num2_art:1581.

Fish farming modifies the sediments and the microbiota in water bodies due to supplementary feed residues, chemical substances, and wastes from the metabolism of animals under production. The current study determined the effect of extensive, semi-intensive, and intensive production of rainbow trout (Oncorhynchus mykiss) in sediments, and the proliferation of nitrifying bacterial communities. Total nitrogen, total phosphorus, total organic carbon, and organic matter, and their relationship with nitrifying bacteria (ammonia-oxidizing bacteria-AOB and nitrite-oxidizing bacteria-NOB) were analyzed in the sediment of Lake Guamuez, located in the department of Nariño, Colombia. The data collected were subjected to analyses of variance (ANOVA) and multiple correlation using the Statgraphics Centurion XV software. The variables evaluated showed significant differences (p < 0.05) between the three fish farming systems and the control point. A high and positive correlation was found between nitrifying bacteria and nitrogen compounds, organic matter, and phosphorous in the sediment. This study concluded that the presence of nitrifying bacteria depends on the amount of existing nitrogen compounds and organic matter in the sediment, and increases as the production system intensifies.

Palavras-chave : nitrifying bacteria; nitrogenous compounds; Oncorhynchus mykiss; pisciculture; sediments.

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