Is difficult to know without any other reference (morphology, size, depth, etc.). There are some general species keys to begin (in spanish sorry), but better if you have some individuals to examine.
Fischer, W., Krupp F., Schneider W., Sommer C., Carpenter K.E.; Niem V.H. 1995. Guía FAO para la Identificación de Especies para los Fines de la Pesca Pacífico centro-oriental. Vol. I to III. FAO. Roma, 1995 (up to Northern Ecuador but can help)
http://www.fao.org/docrep/010/t0852s/t0852s00.htm
Jiménez Prado, Pedro and Beárez, Philippe. 2004. Peces Marinos del Ecuador Continental II.