Evaluating the influence of environmental variables on fish abundance and distribution in the Singhiya River of Morang District, eastern Nepal

Monitoring the impact of fishing pressure on Singhiya River is critical for resource development and sustainability, present situation alarming causing concern among public. This study aimed to identify fish community trends over time space in river, investigate environmental variables abundance dispersion. Monthly sampling was performed from October 2020 September 2021 5th 10th each month. We used three cast nets various mesh sizes (0.5, 2, & 4 cm) monofilament gill with 6, 8, 10 cm. A total 7,593 were collected, representing 61 species seven orders, 20 families, 37 genera. Similarity percentage (SIMPER) analysis revealed 78.8% similarity six stations, primary contributing species: Puntius chola (28.2%), sophore (13.5%), Pethia ticto (5.33%), Chagunius chagunio (3.76%), Barbonymus gonionotus (3.69%), terio (3.46%), Opsarius shacra (2.2%), bendelisis (2.1%). Analysis variance (ANOVA) canonical correspondence that four selected had significant relationship assemblage such as water parameters velocity, temperature, pH, hardness. Overfishing direct discharge industrial waste into resources may be causes decline diversity River.