Julung-julung (Hemirhamphodon pogonognathus) merupakan salah satu spesies ikan asli Indonesia. Aek Mailil merupakan salah satu habitat ikan julung-julug (H. pogonognathus) yang berada di Kabupaten Labuhanbatu. Penelitian bertujuan untuk mendapatkan hubungan panjang-berat dan faktor kondisi ikan julung-julung (H. pogonognathus) yang hidup di Aek Mailil. Pengambilan data dilakukan mulai November 2020 hingga Januari 2021 dengan alat tangkap durung. Titik sampling ditetapkan atas informasi dari masyarakat Desa Bandar Kumbul. Hubungan panjang-berat dihitung dengan Linear Allometrik Model (LAM), sedangkan faktor kondisi dihitung dengan rumus Fulton (K) dan berat relatif (Wr). Pola pertumbuhan ikan julung-julung (H. pogonognathus) mendapatkan hasil alometrik negatif dengan nilai b 2,9371 (b<3). Nilai koefisien Fulton (K) 2,57 dan koefisien berat relatif (Wr) 103,07. Hal ini menunjukkan bahwa pola pertumbuhan ikan julung-julung (H. pogonognathus) allometrik negatif dengan panjang tubuh lebih cepat dibandingkan berat tumbuh. Nilai (K) menunjukkan bahwa Aek Mailil masih dalam keadaan seimbang dan baik untuk mendukung kehidupan ikan julung-julung (H. pogonognathus). Kata kunci: faktor kondisi; Hemirhamphodon pogonognathus; pola pertumbuhan ABSTRACTLong-Weight relationship and condition factors of Julung-Julung (Hemirhamphodon pogonognathus) in Aek Mailil, Labuhanbatu Regency, North Sumatera, Indonesia. Hemirhamphodon pogonognathus is one of Indonesia's native fish species. Aek Mailil is one of the habitats for julung-julung (H. pogonognathus) in Labuhanbatu Regency. This study aimed to determine the relationship between length-weight and condition factors of julung-julung (H. pogonognathus) living in Aek Mailil. Sampling was carried out from November 2020 to January 2021 using durung fishing gear. The sampling points were determined based on information from the local community of Bandar Kumbul Village. The relationship of length-weight is calculated using the Linear Allometric Model (LAM), while the condition factor is calculated using the Fulton formula (K) and relative weight (Wr). The growth pattern of julung-julung (H. pogonognathus) got a negative allometric result with a b value of 2.9371 (b <3). The value of the Fulton coefficient (K) 2.57 and the relative weight coefficient (Wr) 103.07. This means that Aek Mailil's waters are in a balanced state and can support the (H. pogonognathus) live.Keywords: condition factor; Hemirhamphodon pogonognathus; growth pattern
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