| Summary: | Monthly species composition and abundance of Chaetognaths from January 10 December 1991 al two sampling sites, from the Puerto Morelos coral reef lagoon were examined. The species were: Ferosagitta hispida, Flaccisagitta enflata, Flaccisagitta hexaptera, Krohnitta pacifica, Prerosaliitta draco. Sagiua bipunctata, Sagitta helenae, Sagitta (enuis and Serratusagitta serratodentata, most of them being common al both survey areas. F. hispida (station A: 2 801 org./100m3; station B: 11 285 org./100m3) and F. enflata (slation A: 2 878 org./100m3; station B: 5 470 org./100m3) were the most abundant species, representing more than 90% of the total capture. Maximum numbers were regislered in the rainy season and minimal in lhe "Nortes" season. The remaining species were not collected consistently and due lo lheir sporadic caught and scarcity it was not possible to determine any abundance pattern. The coral reef lagoon presented stenohaline conditions (±1. 2 psu all the year round); temperatures showed also small changes (±1.6 °C) and varied according lo the season, being highest during the dry and raíny periods and slightly lower in the "Nortes". Se examinan los resultados de muestreos mensuales de zooplancton de enero a diciembre de 1991, en dos estaciones en la laguna arrecifal de Puerto Morelos, México. Las especies encontradas fueron: Ferosagitta hispida, Flaccisagitta enflata, Flaccisagitta hexaptera, Krohnitta pacifica, Pterosagitta draco, Sagitta bipunctata, S. helenae, Sagitta tenuis y Serratosagitta serratodentata, la mayoría de las cuales se registraron en ambas estaciones de muestreo; Ferosagitta hispida (2 801 org./100m3 , estación A; 11 285 org./100 m3, estación B) y Flaccisagitta enflata (2 878 org./100m3, estación A; 5 470 org./100m3, estación B) fueron las especies más abundantes, representado más de 90% de las capturas totales. Las abundancias máximas se obtuvieron durante la temporada de lluvias y las mínimas durante laltemporada de "Nortes". El resto de las especies se colectaron en forma irregular y ...
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