There are big rivers in Papua province, one of which is the Mamberamo River. The Mamberamo River, known as the Amazon of Indonesia, has very high biodiversity. Silver barb is one of the fish caught in the Mamberamo River. Silver barb is an adaptable fish, has many types and varies. Variations in Silver barb are caused by interactions with the environment as well as isolation mechanisms. This research explains the relationship between weight-length and condition factors Silver barb in Mamberamo River, Papua. The research location consists of four observation stations: Kali Merah, Kerumi, Telaga, and Sungai Putus. Sampling was carried out in February, May, August, and October 2016. The research method used was a survey using an enumerator and analysis using the LAM (linear allometric) model. The results showed that Silver barb growth was allometric negative in February and October, but in May and August, growth was allometric positive. The factor conditions for the Silver barb range 1.014-1.02.
Research on Plankton Community in The Waters of Ogan River Kertapati District, Palembang, South Sumatra Province, has been conducted from March to April 2018. This study aimed to identify the plankton community, i.e., abundance, diversity index, dominance index, similarity index between stations, and describe pollution level conditions based on saprobic coefficient. Sampling in this study using purposive random sampling method at five observation stations with three sampling locations, respectively. The physical and chemical parameters of the waters include temperature, brightness, current speed, pH, Dissolved Oxygen (DO), nitrates, and phosphates. The composition of plankton consists of 47 Genera derived from 8 Classes, with a total abundance value in March ranging from 13-27 ind./L, and the total value of abundance in April 2018 has a range of values of 12-21 ind./L. Plankton diversity index values in about 1.87-2.98 indicate the stability of the moderate biota community. Based on the index of plankton dominance with a range of 0.05-0.21, no species dominate other species or D = 0(<0.5). In contrast, the index of plankton similarity between stations shows the communities between stations are relatively different (<50%). The water quality of the Ogan River based on saprobic coefficients is light to very light.
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