Effect of floating macrophyte cover on the water quality in fishpond - DOI: 10.4025/actascibiolsci.v25i1.2086

• Autor(a) principal: Tavares, Lúcia Helena Sipaúba
• Data de Publicação: 2008
• Outros Autores: Barros, Adriana Fernandes de, Braga, Francisco Manuel de Souza
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Acta Scientiarum Biological Sciences
• Texto Completo: http://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/2086
• topic: viveiros; macrófitas; qualidade da água; aqüicultura; 2.01.00.00-0 Biologia Geral

A study was conducted during 23 days in order to evaluate the impact of floating aquatic macrophyte on the water quality of a fishpond. Water samples were collected in four points, three inside the pond and one in water inlet. Drastic reduction of dissolved oxygen was observed in the pond, down to 0.87 mg/L. No significant differences (P > 0.05) were observed for total CO2, nitrite and ammonia with respect to inlet water (P1) and inside the pond (P2, P3 e P4). Chlorophyll a displayed an inverse relationship with phosphorus. Among nitrogen compounds, ammonia presented the highest concentrations except in water inlet where nitrate was higher, 513.33 µg/l, as well as the highest conductivity values. The pH was slightly acid. The results obtained showed that the macrophyte cover promoted an adverse effect in the medium. Under control, aquatic plants might impact positively due to its capacity to reduce total phosphorus and nitrate in the water column as observed in this study