| dc.description.abstract | The Barumun River is a river located in the northern region of Sumatra
Island, characterized by a tropical rainforest climate and a diverse variety of
nekton species. The river is utilized by the surrounding community, primarily as a
fishing ground for local fishermen. Increasing human activities have led to
changes in land use and increasingly diverse lifestyles. The uncontrolled disposal
of waste from development activities along the river has resulted in water quality
degradation, surpassing the river's carrying capacity. This study was conducted
in October 2024, with fish sampling carried out over a one-month period in North
Sumatra Province. The community structure of fish in the midstream section of the
Barumun River showed a diversity index (H') ranging from 1.64 to 2.22,
categorized as moderate. The evenness index (E) values ranged from 0.71 to 0.96,
indicating high evenness across all research stations. The dominance index (C)
values ranged from 0.13 to 0.33, categorized as low. The relative abundance (RA)
of nekton in the midstream Barumun River revealed the highest abundance from
the Cyprinidae family, specifically Rasbora dusonensis (yellowtail silverside) with
an RA value of 54% and an FI value of 100% at station 11, and Barbodes
schwanenfeldii (lemeduk fish) with an RA value of 19% and an FI value of 100%
at station 15. The relationship between water quality and fish abundance and
diversity in the midstream Barumun River, North Sumatra Province, showed a
positive correlation with depth, pH, current, TDS, DO, TSS, and turbidity. In
contrast, clarity and temperature exhibited a negative correlation. | en_US |
