Abstract

CERVANTES-HERNANDEZ, Pedro et al. Annual abundance variation of Farfantepenaeus californiensis (Holmes 1900) in the Gulf of Tehuantepec. Hidrobiológica [online]. 2008, vol.18, n.3, pp.215-226. ISSN 0188-8897.

The annual abundance variation of recruits (FR index) and spawners (DA index) of Farfantepenaeus californiensis (Holmes 1900) was modeled with age groups related with the natural processes of recruitment and reproduction in the Gulf of Tehuantepec (GT). The FR Index was modeled using the age group of four months and the DA index with the age groups from six to 11 months. The relationships between the sea surface temperature (SST) and both population indices from 1989 to 1998 were quantified, between these and the concentration of the Chlorophyll a (Cla) from November 1996 to May 1998. In both intervals, the SST had a correlation directly proportional with FR and inversely proportional with DA. In the second interval, the Clawas greater during the two maximums abundance DA (R = 0.5627) and lesser during the maximum FR (R = -0.6887). The correlation between the SST and Cla was estimated in -0.6452. Between October/ November and January, the spawners abundance was greater than the abundance of recruits. The maximums DA agreed with maximums of Claand minimum SST during the nortes season or "tehuanos". The massive recruitment to the marine environment was observed in July and August/September when the oceanographic conditions in the GT were inverse to described for the DA index. The annual abundance variation of the FR and DA indices remains constant with the presence of "El Niño" in the GT, but its abundance diminishes.

Keywords : Recruitment; reproduction; brown shrimp; chlorophyll a; Gulf of Tehuantepec.

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