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A previously published conceptual model of the life history of the red crab Pleuroncodes planipes (Galathei- dae) (Stimpson, 1860) reports that the center of distribution of this micronektonic crustacean is located at Bahia Magdalena, on the southwest coast of Baja California (25 to 24° 20' N). During spring, the highest abundance of mature females is found nearshore with abundance peaks of larval stages dur- ing February and March. Larval drift offshore is associated with a strong Ekman transport system, and the virtual disap- pearance of the adult pelagic and benthic population from the neritic region at Bahia Magdalena in late summer and autumn can be explained by an inshore-offshore migration. However, huge benthic-pelagic concentrations of this crus- tacean occur nearshore during autumn at Punta Eugenia (27 to 29° N). Circadian cycles of the spatial distribution of these aggregations were recorded with a single beam echosounder Simrad EY-200 (200 kHz) along Baja California during Octo- ber 1994, March, June, and October 1995, and March and June 1996. Data obtained from Isaacs-Kidd midwater net trawls during October 1994 along Baja California were used to identify the red crab aggregations using hydroacoustics. The target strength of the red crab ranged between -50 and -54 dB. The largest aggregations were found in Bahia Mag- dalena during summer (June 1995 and 1996; 24 to 25° N) and nearshore at Punta Eugenia (27 to 28° N) during autumn and spring (March 1995 and 1996, October 1994 and 1995). These observations suggest that the conceptual model of inshore- offshore adult population migration is valid for Bahia Mag- dalena, but apparently not for Punta Eugenia at least during autumn. At Punta Eugenia an abrupt change in the orienta- tion of the shoreline enhances upwelling events and promotes semipermanent eddies, thus supporting the inshore residence of this adaptive omnivorous-detritivorous crustacean.

Hydroacoustical evidence of autumn inshore residence of the pelagic red crab Pleuroncodes planipes at Punta Eugenia, Baja California, Mexico