Morphometry, age and growth of Siganus luridus Rüppell, 1828 and Siganus rivulatus Forsskål, 1775 (Siganidae) in the central Mediterranean (Libyan coast)

Some biological aspects of two siganid fish species from the Libyan coast were studied in terms of morphometry, age and growth. Two species were collected, between March 2005 and March 2006, comprising of 1,672 individuals of S. rivulatus from the eastern coastline and 1,756 individuals of S. luridu...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Shakman,Esmaile, Winkler,Helmut, Oeberst,Rainer, Kinzelbach,Ragnar
Lenguaje:English
Publicado: Universidad de Valparaíso. Facultad de Ciencias del Mar 2008
Materias:
age
Acceso en línea:http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572008000300011
Etiquetas: Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
Descripción
Sumario:Some biological aspects of two siganid fish species from the Libyan coast were studied in terms of morphometry, age and growth. Two species were collected, between March 2005 and March 2006, comprising of 1,672 individuals of S. rivulatus from the eastern coastline and 1,756 individuals of S. luridus from the western coast and the Gulf of Sirt. The age of each species was estimated based on otoliths analysis and the results were discussed with data available from different areas of the Mediterranean and Red Seas. The age of S. rivulatus ranged from one to six years and S. luridus from one to seven years. The relationships between different morphometric measurements and total lengths for both species were positively correlated. Von Bertalanffy growth functions were estimated with L T = 35 (1 - e -0.160 (t + 1.04)) and L T = 30 (1 - e-0.213 (t + 0.784)) for S. rivulatus and S. luridus respectively. The von Bertalanffy growth curves suggest faster growth rates for S. rivulatus. The length-weight relationships were W T = 0.233 L T 2.82 (S. rivulatus) and W T= 0.101 LT3.23 (S. luridus). S. luridus would increase in weight at a more rapid rate than S. rivulatus, and this may point to a lake of suitable food supply for the S. rivulatus individuals in this region.