The data on length – weight relationship and the associated condition factor also enables to compare the population of the same species from different environments. The study of morphometric characters in fishes is important because they can be used for the differentiation of taxonomic units. The present study provides comprehensive information on the age and growth, length weight relationship, relative condition
factor and morphometry of Gerres filamentosus (Cuvier, 1829) from Kodungallur, Azhikode Estuary, Kerala.