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RESEARCH ARTICLE
Species Composition and Temporal Patterns of Upstream-Migrating Fish at Kamijoro Weir, Yogyakarta, Indonesia
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Abstract
This study aimed to identify species composition, analyze temporal migration patterns, and assess gonad maturity stages of upstream-migrating fish at the Kamijoro Dam on the Lower Progo River, Yogyakarta. We conducted the research over five months (September 2025–January 2026) using a hanging fish trap net installed at the dam, with morning and afternoon sampling. We identified each specimen, measured its total length and weight, and assigned a gonad maturity stage (GML I–V) based on descriptive criteria. We captured 1,603 individuals from seven species of the family Cyprinidae, dominated by Barbonymus schwanefeldii (42.98%) and Mystacoleucus obtusirostris (41.92%). Catch numbers peaked in October (1,028 individuals; 64.1%) and subsequently declined sharply by January (11 individuals). Most catch (81.2%) occurred in the afternoon. GML analysis revealed the following distribution: GML I (3.2%), II (48.9%), III (22.3%), IV (23.4%), and V (2.1%). The dominance of immature fish (GML II–III = 71.2%) suggests that the migration was primarily driven by foraging, whereas the presence of sexually mature fish (GML IV = 23.4%)—specifically among Osteochilus vittatus (56.5%) and Labiobarbus leptocheilus (58.3%)—indicates the occurrence of reproductive migration. The afternoon catch bias reflects circadian rhythms, while the exclusive presence of Cyprinidae suggests community simplification resulting from the weir's influence. The study concludes that the Kamijoro Weir serves as a critical aggregation point for migratory fish exhibiting distinct temporal patterns, highlighting the need for sustainable fisheries management and long-term monitoring.
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