In the Mekong Delta, the fish composition of Gobiidae and Eleotridae is high diversity with 66 species living from fresh to marine water (Tran Dac Dinh et al., 2013). Of these fishes, Glossogobius giuris, Oxyeleotris urophthalmus, Boleophthalmus boddarti are important commercial fishes for food and are widely distributed from inland to estuarine regions (Murdy, 1989; Clayton, 1993) and from tropical to subtropical areas (Chotkowski et al., 1999, Blaber et al., 2000). Boleophthalmus boddarti (Pallas, 1770) and Glossogobius aureus Akihito and Megugo, 1975 are two commercial fishes that contribute to the local fisheries products.