Received: 03-07-2014 / Accepted: 13-08-2014
A study was carried out from December 2009 to December 2013. About 300 specimens was collected in lower Saigon - Dongnai river system. The resultsshowed that 81 species belongingto 56 genera, 32 families wererecognized and classified. Gobid family (Gobiidae) wasthe most diverse group, with 16 species (19.75% of the total). Croakers (Sciaenidae) and Gouramies family (Osphronemidae) were the second-most diverse group, consisting of6 species and account for 7.14%. The Sleepers family (Eleotridae) consistedof 6 species and accountedfor 6.17%. Other families consisted1-4 species, accountingfor 1.23 –4.94%. In the total of species classified, there were 38 migratory species, 35 economy valuable fish species, 2 species which are in Vietnam red list (2007, VU-Vulnerable).