Checklist of native freshwater fish from Surabaya River, Indonesia

ABDUL R. FAQIH (Department of Aquatic Resources Management, Faculty of Fisheries and Marine Sciences, Universitas Brawijaya. Jl. Veteran, Malang 65145, East Java, Indonesia)
RR. JUNI TRIASTUTI (Department of Marine, Faculty of Fisheries and Marine, Universitas Airlangga. Jl. Dr. Ir. Sukarno, Surabaya 60115, East Java, Indonesia)
DITA WISUDYAWATI (Department of Aquaculture, Faculty of Fisheries and Marine, Universitas Airlangga. Jl. Dr. Ir. Sukarno, Surabaya 60115, East Java, Indonesia)
SEPTI ANITASARI (Department of Aquatic Resources Management, Faculty of Fisheries and Marine Sciences, Universitas Brawijaya. Jl. Veteran, Malang 65145, East Java, Indonesia)
VIOL D. KHARISMA (Doctoral Program in Mathematics and Natural Science, Faculty of Science and Technology, Universitas Airlangga. Jl. Dr. Ir. Sukarno, Surabaya 60115, East Java, Indonesia)
RAHMI RAHAYU (Graduate Program of Fisheries and Marine Biotechnology, Universitas Airlangga. Jl. Dr. Ir. Sukarno, Surabaya 60115, East Java, Indonesia)
HERI CAHYONO (Mola Molly Aquatic. Jl. Soekarno Hatta 270, Ponorogo 63411, East Java, Indonesia)
JILA SULIASTINI (Technical Service Unit of Fish and Environmental Health Laboratory. Bajang, Sidepan, Winongan, Pasuruan 67182, East Java, Indonesia)
R. ADHARYAN ISLAMY (Department of Aquatic Resources Management, Faculty of Fisheries and Marine Sciences, Universitas Brawijaya. Jl. Veteran, Malang 65145, East Java, Indonesia)
FITRI S. VALEN (Department of Aquaculture, Faculty of Agriculture, Fisheries and Biology, Universitas Bangka Belitung. Jl. Kampus Terpadu UBB, Bangka 33127, Bangka Belitung, Indonesia)
MUHAMMAD B. TAMAM (Department of Biology, Faculty of Science, Technology and Education, Universitas Muhammadiyah Lamongan. Jl. Raya Plalangan KM 02, Lamongan 62218, East Java, Indonesia)
PRIGI ARISANDI (Ecological Observation and Wetland Conservation (ECOTON). Kandangasin, Wringinanom, Gresik 61176, East Java, Indonesia)
JOSIE SOUTH (School of Biology, Faculty of Biological Sciences, University of Leeds. Woodhouse, Leeds LS2 9JT, United Kingdom)
AHMAD S. KAMARUDIN (School of Animal Science, Aquatic Science and Environment, Universiti Sultan Zainal Abidin. Besut Campus, Besut 22200, Terengganu, Malaysia)
ALIFA K. WIJAYA (Department of Aquaculture, Faculty of Fisheries and Marine, Universitas Airlangga. Jl. Dr. Ir. Sukarno, Surabaya 60115, East Java, Indonesia)
VERYL HASAN (Department of Aquaculture, Faculty of Fisheries and Marine, Universitas Airlangga. Jl. Dr. Ir. Sukarno, Surabaya 60115, East Java, Indonesia)

Biodiversitas Journal of Biological Diversity
Vol. 27 No. 3 (2026)

Abstract. Faqih AR, Triastuti RRJ, Wisudyawati D, Anitasari S, Kharisma VD, Rahayu R, Cahyono H, Suliastini J, Islamy RA, Valen FS, Tamam MB, Arisandi P, South J, Kamarudin AS, Wijaya AK, Hasan V. 2026. Checklist of native freshwater fish from Surabaya River, Indonesia. Biodiversitas 27 (3): d270327. https://doi.org/10.13057/biodiv/d270327. Surabaya River is a tributary of the Brantas River and is habitat to several freshwater fish species. The aim of this study was to provide information on the species composition of freshwater fish in the Surabaya River, one of the most important rivers in East Java, Indonesia. All samples used in this study were caught from December 25, 2025, to January 25, 2026. Sampling was conducted at three stations on the Surabaya River: the starting point of the bifurcation at Mlirip Sluice Gate, Mojokerto Regency (Station 1); Krian Sub-District, Sidoarjo Regency (Station 2); and the end of the river at Jagir Sluice Gate, Surabaya City (Station 3). Specimens were identified using specialized papers and books. This work recorded 35 fish species across 31 genera and 17 families. Cyprinidae was the dominant family, comprising 10 genera and 11 species. Station 1 had the highest species richness (34 species), while Station 3 had the lowest (17 species). Several species endemic of Java, such as Java walking catfish Clarias batrachus, Asian redtail catfish Hemibagrus nemurus, wrestling halfbeak Dermogenys pusilla, and spotted barb Barbodes binotatus, were found in this study, indicating that further attention is needed to preserve their habitat. The new information on freshwater fish diversity across different parts of the river will be useful for updating the current database on Javanese freshwater fish species diversity and for providing an updated native species inventory for three segments during the 2025-2026 sampling. Information on the habitat use and ecological interactions of fish occurring in the Surabaya River is urgently needed to make appropriate conservation decisions and plans.