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Six silvofishery systems were constructed to estimate the potential use of mangrove seedlings for nutrient removal. Two systems did not contain seedlings (i.e., control treatment), while the remaining systems were divided into separate treatments using two mangrove species (Laguncularia racemosa and Rhizophora mangle). Each system consisted of two water tanks linked by two hoses. The first tank contained 150 poeciliid fishes, while the second contained a biological filter of gravel and sand on the bottom, as well as a hydroponic arrangement of 34 seedlings. Water exchange between both tanks was performed over a 24-h period, every ten days for seven months, and the concentration of nutrients (NH4 +, NO2 –, NO3 –, and PO4 –3) was measured every 8 h. Laguncularia racemosa showed a higher growth rate compared to R. mangle, but there were no differences regarding the growth of fishes among the six systems. Final dissolved inorganic nitrogen removal was 42% in the control treatment and 90% in both treatments using mangroves. Dissolved inorganic phosphorus removal was 45% in the control treatment, 44% in the L. racemosa treatment, and 35% in the R. mangle treatment. Our results indicate that both mangrove species are capable of removing a considerable amount of nitrogen, but phosphorus removal was unsatisfactory.   Seis sistemas de cultivo fueron construidos para evaluar el uso potencial de plantulas de mangle en la remocion de nutrientes. Dos de los sistemas no contenian plantulas (i.e., control), mientras que los sistemas restantes fueron divididos en tratamientos por separado con dos especies de mangle (Laguncularia racemosa y Rhizophora mangle). Cada sistema consistio en dos tanques de almacenamiento unidos por dos tubos. El primer tanque contenia 150 peces poecilidos, mientras que el segundo tanque contenia 34 plantulas en forma hidroponica y un filtro biologico de grava y arena en el fondo. Se hicieron recirculaciones de agua entre ambos tanques cada diez dias por un periodo de siete meses. Durante cada recirculacion, se midio la concentracion de nutrientes (NH4 +, NO2 –, NO3 – y PO4 –3) cada 8 h. Laguncularia racemosa presento una tasa de crecimiento mayor comparada con R. mangle; sin embargo, el crecimiento de los peces fue igual entre los seis sistemas. El porcentaje final de nitrogeno inorganico disuelto fue 42% en el tratamiento de control y 90% en los tratamientos con L. racemosa y R. mangle. El porcentaje de remocion de fosforo inorganico disuelto fue 45% en el control, 44% en el tratamiento con L. racemosa y 35% en el tratamiento con R. mangle. Los resultados indican que ambas especies de mangle son capaces de remover una cantidad considerable de nitrogeno, pero la remocion de fosforo fue insatisfactoria.

Potential use of two subtropical mangrove species (Laguncularia racemosa and Rhizophora mangle) for nutrient removal in closed recirculating systems