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Se describe la composicion especifica y estructura de una capa de dispersion profunda encontrada en el suroeste de la peninsula de Baja California, Mexico. Los muestreos se realizaron mediante arrastres con red Isaacs-Kidd, red Bongo y registros hidroacusticos. Los resultados demuestran la dominancia de tres especies: un eufausido, Euphausia eximia Hansen 1911; un decapodo de la familia Galatheidae. Pleuroncodes planipes (Stimpson. 1860); y un pez de la familia Photichthyidae, Vinciguerria lucetia (Garman, 1899). Los ecos acusticos de la capa de dispersion profunda fueron separados de acuerdo con la fuerza de blanco usando una ecosonda SIMRAD EY-200, con una frecucncia de 200 kHz. y un programa denominado Hydro Acoustic Data Acquisition System (HADAS). Los eufaudidos fueron asociados con un intervalo de fuerza de blancos entre -56 y -62 dB, las langostillas entre -51 y -55 dB,.y los peces entre -32 y -50 dB. Los resultados indican que los organismos presentaron una distribucion no azarosa dentro de Ia capa de dispersion profunda, esto es,.tuvieron una estructura interna tanto en sentido horizontal como vertical.  The structure of an intense deep scattering layer off the southwest coast of Baja California, Mexico, is described using Isaacs-Kidd net trawl samples, Bongo samples and hydroacoustic records. Results demonstrate the dominance of three organisms: an euphausiid, Euphausia eximia Hansen 1911; a decapad of the family Galatheidae, Pleuroncodes planipes (Stimpson, 1860); and a fish of the family Photichthyidae, Vinciguerria lucetia (Garman, 1899). Using a SIMRAD EY-200 echosounder, with a working frequency of 200 kHz, and a Hydro Acoustic Data Acquisition System (HADAS), echoes were separated according to their target strength. Euphausiids were associated with the -56 to -62 dB target strength group, the red crabs with the -51 to -55 dB group, and fishes with the -32 to -50 dB group. Results indicate that organisms within the layer were not randomly distributed, but that they have an internal] structure both in a horizontal and vertical dimension.

On the structure of a deep scattering layer on the coastal shelf off bahía magdalena, baja california, mexico