A SPAWNING AGGREGATION OF NASSAU GROUPER EPINEPHELUS-STRIATUS (PISCES, SERRANIDAE) IN THE MEXICAN CARIBBEAN

An annual spawning aggregation of Nassau grouper, Epinephelus striatus , observed off the southern coast of Quintana Roo, Mexico, on full moo n days in December and January, was surveyed during the winters from 1 991 to 1993. A fish aggregation had been appearing at one traditional site off Mahahual for more than 80 years, but currently it forms at un determined sites far from the original site. Fish migration was northw ards in the fore reef border along the 14 m isobath and isolated group s were observed. Through visual assessment fish aggregations were foun d to include 200 to 500 individuals. The fishing on Nassau grouper agg regations has been active since 1910 by using hook and line; however, recently fishermen used gill nets. It is necessary to continue the res earch on this aggregation and establish management guidelines to prote ct the species.