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Traditionally the central west coast of Baja California peninsula has been considered a zone of reproduction and recruitment of the larval stages for Panulirus interruptus (Randall, 1840); this specie is distributed from Point Conception, USA to Bahía Magdalena, México and displays a complex life cycle between environments pelagic and benthic. The area is influenced by oceanographic conditions of the California Current and the North equatorial undercurrent, both currents are modified by the influence of the El Niño and La Niña events. During 1999, 2000 and 2001, the area was influenced by cold oceanographic conditions, considering to 2001 the third consecutive year as a period of cold. The variations in the reproductive period and recruitment are associated with the dominant physical characteristics of this area, influencing patterns distribution and abundance of the different stages of development of P. interruptus (phyllosomes and puerulus). The goal of this work is evaluate these patterns during cooling the 1999-2001 periods. We present result on the study of the interannual variation in two cohorts, C 1 (1999-2000) and C2 (2000-2001) on the study of the distribution and abundance of larval stages of P. interruptus in the west coast of Baja California Peninsula. The samples were taken by IMECOCAL program, collected in ten oceanographic surveys made in January, April, July and October. The eleven stages were found in the C1 with 1723 larvae/lOm² and ten stages with 2113 larvae/lOm² in C2. The greater abundances appeared in October and January ofboth cohorts. The presence ofthe eleven stages phyllosomes and puerulus are in coincidence with life cycle: reproduction/hatching (initial stage in summer) and settlement (final stage in surnmer), which they could indicate that the approximate time ofthe larval stage (I-XI and puerulo) of P. interruptus extends around one year and don't 7 months %. In both cohorts was observed differences between the temperature and correspondence with the stages larvae. In C 1 there was presence of the eleven stages between 18 and 20°C, while in the C2 the stage larvae appearing in the early stages warmer temperatures (22°C) and the final stages in colder temperatures (17°C). The latitudinal distribution comparison are difference in both cohorts: for C 1 initials stages showed a greater abundance with a coastal distribution throughout the peninsula while the intermediate stages has distribution to the central at southern region and final stages on region central. However for C2 all stages larvae showed distribution along the coast. It was noted that the distribution of larvae is coupled with the prevailing currents flows and only in some cases are associated with eddies and meanders.

Palabras clave: cohorts; puerulus; IMECOCAL; Peninsula of Baja California; Phyllosmas

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