The potential for fish production is very important as a necessary material for WPP PD in making policies. Estimation of fishery production potential is adjusted to aquatic ecosystem. The method used differs between running and stagnant water based on the shape of the water. Fishery resources in Indonesia, especially inland fisheries, still cannot be managed and utilized optimally and sustainably. The method used in estimating fishery stocks in the watershed is the Leger-Huet method. Research to estimate fish production potential using the benthic biomass approach using the Leger-Huet method was carried out in February, June, and October 2019 in the Sumani River and Ombilin River, Singkarak Lake. The research objective was to determine the estimated value of fish production potential through the benthic biomass approach in the Sumani River (Inlet) and Ombilin River (Outlet), Singkarak Lake. The calculation of benthic biomass and fish production potential was carried out at the Testing Laboratory of the Research Institute for Inland Fisheries and Extension in Palembang. This system is expected to be able to provide alternative solutions for decision-making and agencies to determine the potential for fish production in an area. The determination of the potential for fish production using the benthic biomass approach is highly dependent on the width of the river. The results showed that the types of benthos in the Sumani and Ombilin rivers were 5 classes and 17 families. The benthos found by the Ombilin River are more varied than those in the Sumani River, and the estimated fish production potential of the Ombilin River is greater than that of the Sumani River. The highest yield of benthic biomass was found in the Ombilin River (159.06 gr/m2) compared to the Sumani River (76.06 gr/m2). Meanwhile, the average potential fish production in the Batang Sumani River (573.8 (kg/ha) is higher than in the Ombilin River (244.74 kg/ha).

Lake Cala, a fishery potential oxbow lake, is located in Musi Banyuasin, South Sumatra. Lake Cala is a wetland that flooded during high tide and become land in dry season. The study was conducted to determine present status of the diversity and the condition of fish. This study has been done at Lake Cala in February until March 2017. On this tide season, data were collected by fishers. The fish sampling was conducted using hook line, cast nets, gillnets and fish traps (corong). A total of 27 fish species belongs to three ordo,11 families, and 19 genera were recorded during the study. Diversity of fish in Lake Cala on the tide season is dominated by whitefishes. Based on its potency, most fish species are 59% consumption, 33% double potency, and 8% ornamental fish. Aro (Osteochilus melanopleura) and palau (O. vittatus) from Cyprinidae family, and baung (Mystus nemerus) from Bagridae family were dominant. The length-weight relationship showed that dominant two species of fish (baung and palau) had positive allometric growth patterns, while aro is isometric. Those parameters obtained from the study are useful fundamental information applicable in the future population dynamics studies. Furthermore, based on these result it was necessary to manage the fishing gears operation and regulating tributaries to maintain the process of fish on search for feed, distribution, and colonization of various species and populations.