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RESEARCH ARTICLE
Biodiversity of Ichthyofauna in The Pabelan River, Magelang Regency
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Abstract
Pabelan River is one of the most important rivers in Magelang Regency. This research aims to determine the diversity and composition of the ichthyofauna in the Pabelan River, Magelang Regency. The research was conducted from August to October 2025 at three observation stations selected through purposive sampling. Fish were caught using nets with a mesh size of ¾ inch and a diameter of 4 meters. Sampling was conducted over eight weeks, twice a week, from 08.00-14.00 WIB, for two hours at each research station. Data analysis was conducted using the Shannon-Wiener diversity index (H’), Evenness uniformity index (E), and Simpson dominance index (C). The results show that there are 13 fish species classified into 8 families and 4 orders, with the order Cypriniformes being the most dominant. Ancistrus multispinis is recorded as the overall dominant species (RA 43.6%), but it was only found at the settlement station. The average length distribution of the fish was dominated by small fish (<10 cm), accounting for more than 50%. Meanwhile, the average weight percentage of fish sized <10 gs was more than 38%. The diversity index value (H’) obtained ranged from 0.81 to 1.73, the evenness index (E) from 0.35 to 0.83, and the dominance index (C) from 0.20 to 0.65. Environmental parameters indicate temperatures of 25.9–26.7 °C and a pH of 7.25–7.49, within the range that supports freshwater fish life. Meanwhile, the physical conditions of the water show a current speed of 0.31–0.73 m/s, a brightness of 8.8–11.6 cm, a depth of 43–59 cm, and a width of 17.3–29.2 m. Overall, the diversity of ichthyofauna in the Pabelan River is classified as moderate, with environmental conditions that still support freshwater fish.
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