Information on length-weight relationship (LWR) is useful for fishery management and stock biomass assessment (Froese, 1998;Froese and Pauly, 2000;Gonzalez Acostaet al., 2004;Mahmoodet al., 2012). Fish growth pattern is determined using the slope value (b) obtained from the LWR regression (Froese, 2006), and the differences in fish well-being between genders and locations are related to the variations in condition factor (K) (Abdoli et al., 2009). However, little is known about the morphometric changes, LWR and condition factor in many gobiid species that live in the muddy flat in the Mekong delta.