[Size structure, gonadic development and diet of the fish Diapterus rhombeus (Gerreidae) in the Pom-Atasta fluvial-deltaic system, Campeche, Mexico].
The fish Diapterus rhombeus was studied during an annual cycle from 1992 to 1993 in the fluvial-deltaic Pom-Atasta system associated with Terminos Lagoon, Campeche, Mexico. It is a dominant species in the system, based on its numeric abundance, weight, high frequency and wide distribution. A total of 745 individuals were obtained, with a weigth of 2 890.2 g and length ranging from 3.0 to 16.7 cm. The annual variation of the allometric coefficient b was from 2.71 to 3.345. The condition factor varied from 0.711 to 0.934. The statistical analysis shows significant differences (p < 0.05) between the seasons of the year and the habitats of the system for the weight, the longitude and the condition factor K, which reflects the space-temporal utilization of the system for the species. The population present at Pom-Atasta, consists mainly by juvenile and few preadults individuals in gonadal stages I, II, and III, and more females than males were recorded. This species utilizes the system as a nursery area, growth and feeding area. It has a varied trophic spectrum, and consumes at least eight different groups. Its principal food items are undetermined organic matter, foraminifers, ostracods and tanaidaceans. It is a first order consumer. The Pom-Atasta system is located in a zone of intense fishing and oil activity, so it is important to advance in the knowledge of its fishing resources.
Aguirre-León
Arturo
A
Universidad Autónoma Metropolitana-Xochimilco, Departamento El Hombre y su Ambiente, Calzada del Hueso 1100, Col. Villa Quietud, México 04960, D.F. agla1269@correo.xoc.uam.mx
Díaz-Ruiz
Silvia
S
D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D004032:Diet; D017753:Ecosystem; D005247:Feeding Behavior; D005260:Female; D005399:Fishes / Q000033:anatomy & histology* / Q000502:physiology*; D005618:Fresh Water; D005766:Gastrointestinal Contents; D006801:Humans; D008018:Life Cycle Stages; D008297:Male; D008800:Mexico; D011156:Population Density; D012098:Reproduction; D012621:Seasons