Sungai Kayan yang berada di Kabupaten Bulungan Provinsi Kalimantan Utara memiliki peranan penting bagi masyarakat yang bermukim di sepanjang sungai tersebut, baik sebagai sarana transportasi maupun sebagai tempat usaha untuk menggantungkan hidup sehari-hari. Salah satu sumber daya ikan di Sungai Kayan adalah ikan Tawes (Barbonymus gonionotus). Tujuan dari penelitian ini adalah untuk mengetahui morfometrik dan meristik ikan Tawes di perairan Kayan Desa Long Bia Kecamatan Peso. Metode penelitian yang digunakan yaitu metode deskriptif kuantitatif. Pengambilan sampel dilakukan sebanyak 2 kali sehari selama 1 bulan. Jumlah sampel yang digunakan selama penelitian sebanyak 30 ekor. Hasil penelitian menunjukkan hasil analisis regresi linier karakter morfometrik terhadap panjang total memiliki hubungan yang sangat kuat, yaitu berkisar 0,91-0,99. Karakter meristik ikan Tawes adalah P.II.10-12, D.VI.8-9, V.II.6-8, A.III.4-6, C.17-20 dan gurat sisik 28-30.
Kata kunci: Morfometrik, Meristik, Barbonymus Gonionotus

The Kayan River, which runs through Bulungan Regency in North Kalimantan Province, serves an important purpose for the people who live along it, serving as both a mode of transportation and a place of commerce Tawes fish is one of the Kayan River's fish resources (Barbonym gonnous) The purpose of this research was to find out about the morphometrics and meristics of Tawes fish in Kayan waters, Long His Village, Peso District. A quantitative descriptive method was used for the research For one month, samples were taken twice a day During the study. 30 fishes were used as samples. The results of the linear regression analysis of morphometric characters to total length revealed a very strong relationship ranging from 091 to 099 Tawes fish had the following charactenstics PII 10-12 DVI 8-9. V 11.6-8. A III 4-6, C 17-20, and scale line 28-30. Keywords: Morphometric, Meristic, Barbuonymus gonionotus