First study of water quality in the San Camilo and Mojahuevo estuaries located in Guayas for being used in aquaculture

Abstract

The water quality of the San Camilo and Mojahuevo estuaries was monitored in the months of April (rainy season) and June (dry season) of 2016. The water of the Mojahuevo estury presented in both seasons the lowest values of turbidity between 17.20 and 33.70 UNT, biochemical oxygen demand being in a range between 14.00 and 19.00 mg/L, zinc content (0.02-0.05 mg/L) and copper content (0.07 mg/L), ammonia content (0.21-0.35 mg/L), fats and oils (0.23-0.29 mg/L), phosphates (0.39-2.34 mg/L) and nitrates (0.84-2.29 mg/L), while the water of the two estuaries San Camilo and Mojahuevo (rainy season) showed similar phenolic content (0.019 mg/L). The results showed that the Mojahuevo estuary presented the high quality of water recommended for being used in productive process like aquaculture due to the low presence of pollutants.

Evaluacion de la calidad de agua mediante un analisis multivariante en los esteros del Golfo de Fonseca, Honduras.

“…This variable is used to quantify the organic pollution load (Galal-Gorchev et al, 1993), and it shows averages between 5.62 and 21.92 mg/l, with maximum values of up to 368.5 mg/l in different estuaries, which indicates that the input of anthropogenic effluent waters contributes to BDO 5 in the analyzed estuaries (Barakat et al, 2016), and in many cases with values above the permitted limits. The study by Rodríguez-Grimón et al (2021) showed similar values with averages of 14.00-19.00 mg/l in Estero Mohajuevos in Ecuador, emphasizing that high BDO is common when it derives from commercial anthropogenic sources, as industrial discharges from these facilities often reduce biodegradability or the natural water purification ability. Green and Ward (2011) studied the final oxygen biochemical demand in semi-intensively managed shrimp farms along esteros La Jagua, Pedregales, San Bernardo, Berbería, and El Garcero, finding that 86 % of the exchange water samples had BDO 5 lower than 20 mg/l.…”

Análisis de la forma de la concha de Anadara tuberculosa como indicador de contaminación en manglares.

“…Estudios recientes en la costa ecuatoriana reportaron la presencia de contaminantes en ríos y esteros como consecuencia de los efluentes líquidos no tratados procedentes de las diversas actividades económicas (Moscoso-Cercado, 2021;Lozano-Pérez & Mora-Solórzano, 2021;Rodríguez-Grimón et al, 2021). Dentro de estos, destaca la presencia de cadmio (Cd), plomo (Pb) y mercurio (Hg) en agua y sedimentos del estero de Soledad Grande, ubicado en la reserva ecológica manglares Churute y en la zona pesquera de Balao, dentro del Golfo de Guayaquil, provincia de Guayas (Beltrán-Meléndez & Gálvez-Rodríguez, 2022).…”