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The hydrographic conditions along the southwestern coast of the Peninsula Baja California influence the vertical distribution of fish larvae in summer June 2010. Along the stations line, from north (in front of Baja California coast at 24°N-112°W) to south (to the coast in front of Cabo San Lucas at 22.5°N-110.5°W), a hydrographic and zooplanktonic intensive sampling was made. Physical and chemical data were obtained using a CTD and LADCP. Zooplankton hauls were using closed-open-closed net (505 ?m). The oblique hauls were every 15 m, in the first 45 m depth, and every 50 m, from 200 to 50 m depth. From a total of 1,741 collected fish larvae, there were identified 34 families and 73 taxa. The zooplanktonic biomass presented the higher values (? 500 mL/1000m3) in the surface stratum with maximum surface oxygen values of 3-5 mL/L for the northern stations. The higher abundances of fish larvae (? 250 larvae/10m2) are located at the southern stations, but opposite to the biomass, their distribution is between 0-200 m depth. The oxyplet of 1 mL/L was observed at ~70 m depth in front of Cabo San Lucas and deepens northward to ~220 m depth. A saline front (~34.4) was observed outward of the Gulf of California which breaks the surface and deepens up to 200 m depth. Northward of the salinity front, low salinity values (~33.6-34) and low temperatures values are observed (12-18°C). At the north of the front there are two habitats with low fish larvae abundance related to the California Current with Triphoturus mexicanus as dominant species. Southward of the salinity front, higher salinity values (~34.6-34.8) and low temperatures values are observed (12-22°C). Showing two tropical habitats with higher fish larvae abundance, one in the upper 50 m depth (with dominance of Vinciguerria lucetia) and the other below the oxyplet of 1 mL/L (dominated by Diogenichthys laternatus). This strong heterogeneity in their vertical distribution reflects the variability of this convergence region, where the equatorward California Current water meets with the poleward Surface Tropical water moving northward.

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