Article
Análisis del contenido gástrico de adultos de Opisthonema libertate, y su comparación con el plancton circundante
Fecha
1989-12-01Registro en:
Romero Ibarra, N. & A. Esquivel Herrera. 1989. Análisis del contenido gástrico de adultos de Opisthonema libertate, y su comparación con el plancton circundante. Inv. Mar. CICIMAR, vol. 4(2): 267-279.
0186-5102
Autor
Romero Ibarra, N.
Esquivel Herrera, A.
Institución
Resumen
The trophic range of the thread herring Opisthonema libertate within the Bahia Magdalena-Bahia Almejas lagoon complex from July 1983 to June 1984, was determined through the analysis of stomach content from sardines caught by the commercial fleet. The species composition of stomach content was compared with that of plankton tows simultaneous to the capture of sardines. Phytoplankton accounted for a 60 % of stomach contents in 325 individuals, with the diatoms Rhizosolenia alata, Melosira sulcata and Guinardia fláccida being the most frequent species. The most frequent zooplankters were the copepods Euterpina acutifrons, Oithona rigida and Corycaeus sp. The probable casual factors which explain the high frequencies shown by these species within the sardines stomachs, are discussed on basis of their structural features, frequency at the capture area and nature of the sieving apparatus of sardines