Biodiversity of nekton in Batangtoru River and its tributaries in North Sumatra, Indonesia

Abstract

Abstract. Desrita, Muhtadi A, Leidonald R, Sibagaring RD, Nurfadillah 2020. Biodiversity of nekton in Batangtoru River and its tributaries in North Sumatra, Indonesia. Biodiversitas 21: 2344-2352. Batangtoru River which flows from the Tapanuli highlands (i.e., Sipirok, Tarutung, Siborong-borong, and Silangit) to the southwestern Indian Ocean is an important habitat for aquatic organisms in the western region of North Sumatra. This research was done to provide basic data on biodiversity of aquatic organisms in Indonesia, especially North Sumatra. The study was conducted in July-August 2019. Nekton was captured using backpack electrofishing units (12 volts and 9 Amperes), traps, nets, and bamboo trap. This study found 68 nekton species, consisting of fish (57 species), crab (3), shrimp (6), lobster (1), and 1 freshwater turtle (1). In general, nekton found in the Batangtoru River and its tributaries are native and economically valuable fish (Tor and eel), including the newly discovered species, which was, Hemibagrus caveatus. Invasive fish found consisted of 6 species, i.e., Cyprinus carpio, Oreochromis mossambicus, Oreochromis niloticus, Xiphophorus helleri, Hypostomus plecostomus, and Trichogaster pectoralis. The only invasive crustacean found was freshwater crayfish (Cherax quadricarinatus).

The diversity, distribution, biomass, and conservation status of ichthyofauna of the Singkil peat swamp in Aceh Province, Indonesia

“…At present, approximately 1,270 species of cyprinids are reported to be living in freshwater around the world (Ng et al 2018;Ramoejane et al 2020;Froese and Pauly 2021;Kambikambi et al 2021). Apart from the Singkil peat swamp, this group of fish also dominated several rivers or ecosystems in Indonesia, including the Tripa Peat Swamp (Muchlisin et al 2015a), the Krueng Geumpang and Krueng Sabee Rivers (Nasir et al 2018;Timorya et al 2018;Nasir et al 2021), Krueng Aceh River, Aceh Province (Dekar et al 2018), and Batangtoru River, North Sumatra (Desrita et al 2020). Furthermore, the majority of the fish species had the potential to be cultured for both consumption and ornamental purposes.…”

Spatial distribution management of Crustacea (Decapoda) based on conservation in tropical tidal lake

“…In the eastern part (point 4) and the river (point 11), the proportions between species are uneven, with lower species richness (4-8 species) due to lower diversity. Desrita et al (2018Desrita et al ( , 2020 stated that the diversity index is not only based on species richness but influenced by the respective proportions of species in the community. The high diversity of crustaceans at stations 6 and 8 is also accompanied by a high evenness index close to 1 and the absence of a dominant one (C value <0.25).…”

Combining eDNA metabarcoding and conventional method in rapid screening of fish diversity in Maros-Pangkep Global Geopark, South Sulawesi, Indonesia

“…This condition has altered the morphometric of the rivers which in some parts are becoming narrow and eventually change the hydrological flow (Salam et al 2021). Consequently, the alteration of river flow patterns and water quality could adversely impact the fish population and, on the worst occasion, account for the loss of 80% of aquatic biodiversity (Janse et al 2015;Desrita et al 2020).…”