Received: 10-05-2018 / Accepted: 05-10-2018
A study on population dynamics of Javaen barb (Systomus rubripinnis)was carried out from January toDecember, 2016 along Hau River in An Giang and Can Tho provinces. Trap fence nets and gill nets were used for monthly fish catch sampling. Fishes were counted and measured for body weight (g) and length (cm) to monitor the temporal and spatial fluctuation on quantity and size. Results showed that the growth rate was high (K = 0.5/year); the survival rate after hatching to fishing size in the wild was low (6.2%); the total mortality was 2.8/year, and the fish was mostly caught at 8-11 cm in body length. The fish of smaller sizes was not affected by fishing gears and larger sizes were rarely found in the wild. The total length of fish could reach 20.5 cm. The breeding of this species occurred the whole year round with the peak in rainy and flooding seasons. Phytoplankton and detritus were the main food of this species. Larger fish was found more abundant upstream.