Morphometry, age and growth ofSiganus luridusRüppell, 1828 andSiganus rivulatusForsskal, 1775 (Siganidae) in the central Mediterranean (Libyan coast)
2008
Shakman, Esmaile | Winkler, Helmut M. | Oeberst, Rainer | Kinzelbach, Ragnar
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 LT = 35 (1 e -0.160 (t + 1.04)) and LT = 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 WT = 0.233 LT 2.82 (S. rivulatus) and WT = 0.101 LT 3.23 (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.
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