This study evaluated Length-Weight Relationships (LWRs) and Condition factor (K) of the juvenile and young adult fish from shallow littoral zones in some aquatic ecosystems located in Khuzestan province, Iran. On June 2015, the specimens were sampled using a seine net from the Shadegan Wetland, the Dez and the Karkheh Rivers in the time period of increased juvenile recruitment. The LWRs of fish was calculated using linear regression log formula as log W=loga+blogTL and the K estimated using K=W/L3. A total of 18 species belong to 5 families collected in the stations. Exotic species comprised 33.33% of the total ichthyofauna. The variation of b-value ranges between 2.65 and 3.26 and growth pattern is isometric in all species except Acanthobrama marmid (Heckel 1843). Since, the amount of K was higher than 1 in all species, it can be concluded that the sampling stations are favorable for the growth of the fish. The shallow waters have considerable importance in juvenile lifestyle, therefore, it is necessary to conserve and restore the habitats.