Structure of the fish communities of Raya Lagoon, Margarita Island, Venezuela

• Pablo Ramírez Villarroel ^[1]
  1. [1] Universidad de Oriente

     Universidad de Oriente

     Venezuela

     
• Localización: Ciencias marinas, ISSN 0185-3880, ISSN-e 2395-9053, Vol. 20, Nº 1, 1994, págs. 1-16
• Idioma: inglés
• Títulos paralelos:
  • Estructura de las comunidades de peces de la laguna de Raya, Isla de Margarita, Venezuela
• Enlaces
  • Texto completo
• Resumen
  • español

    Se analizó la estructura de la comunidad de peces de la Laguna de Raya durante 1990. Las capturas se efectuaron mensualmente en la boca y el interior de la laguna, utilizando un chinchorro playero de 3 1 m de longitud, 2.15 m de altura y 6 mm de abertura de malla. Se capturaron 19,516 especímenes, correspondientes a 30 familias, 50 géneros y 62 especies. Las más numerosas fueron Anchoa hepsetus, con 36.60%, y Eucinostomus gula, con 23.51%. La diversidad numérica fluctuó entre 1.74 y 3.51 bits/ind, la diversidad en peso, entre 1.91 y 3.5 bits/ind: la riqueza de especies, entre 3.45 y 4.29; la equitatividad, entre 0.48 y 0.74; la redundancia, entre 0.28 y 0.67; la dominancia, entre 42.25 y 80.61%. Las especies dominantes fueron: Eucinostomus gula, Diapterus rhombeus, Anchoa hepsetus, Archosargus rhomboidalis, Atius herzbergii y Xenomelaniris brasiliensis. Se encontró 41.94% de visitantes ocasionales, 30.65% de visitantes cíclicos y 27.42% de residentes permanentes. Igualmente, se encontró 40.32% de especies consumidoras de primer orden, 40.32% de segundo orden y 19.36% de tercer orden. El bajo porcentaje de residentes permanentes indica la inestabilidad de esta área.

  • English

    The structure of the fish community of Raya Lagoon was analysed during 1990. Monthly catches were made in the mouth and inner part of the lagoon, using a 6 mm-mesh beach seine net, 31 m in length and 2.15 m in height. A total of 19,516 specimens, corresponding to 30 families, 50 genera and 62 species, were caught. The most numerous were Anchoa hepsetus, 36.60%, and Eucinostomus gula, 23.51%. Numerical diversity fluctuated between 1.74 and 3.51 bits/ind diversity in terms of weight, between 1.91 and 3.5 bits/ind, species richness, between 3.45 and 4.29; equitability, between 0.48 and 0.74; redundancy, between 0.28 and 0.67; dominance, between 42.25 and 80.61%. The dominant species were Eucinostomus gula, Diapterus rhombeus, Anchoa hepsetus, Archosargus rhomboidalis, Arius herzbergii and Xenomelaniris brasiliensis. Of the species found, 41.94% were occasional visitors, 30.65% were cyclical visitors and 27.42% were permanent residents. Likewise, 40.32% were first order consumer species; 40.32%, second order consumers; 19.36%, third order consumers. The low percentage of permanent residents indicates this area’s instability.