Abstract

Since 2000, first indications of the occurrence of a spawning aggregation of red hind E. guttatus in the Alacranes Reef were identified through interviews with local fishermen. From 2002 through 2004, an area located in the northeast reef and known as the "sandwich" was monitored monthly during the days prior to and after the Full Moon. The determination of density of E. guttatus in the site allowed us to define that the months of January to March are the peak time of reproduction of this specie. The presence of hyalin oocytes, observed macrocospically, in females examples allowed us to confirm the occurrence of spawning aggregation in this particular area of the Alacranes Reef. The size of the organisms observed in the aggregation corresponded to adult organisms and were between the 20 and 45 cm. total length. The sex ratio was estimated at 1:6 male:female. Reproductive behavior was observed, in the same site and during such months, throughout the time of study. The aggregation is located at a depth of 85 feet, and it displays a dominant cover of smooth corals, mainly gorgonians. Fishing data are included and discussed in this work.

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