Bagus Prasetyo Aji, Fuad, Wahyu Isroni, Lisa Nur Hidayah, Adi Tiya Yanuar, Anjas Sasana Bahari
Mini trawl fisheries remain widely used in Indonesian coastal waters despite regulatory bans on trawl operations, raising ecological concerns due to their low selectivity. This study analyzed 125 mini trawl landings in Lamongan, East Java, recording 8,105 kg of biomass across 32 species. The catch was dominated by Stolephorus sp. (51.4%) and Leiognathus splendens (21.8%). Diversity indices indicated low richness (R1 = 2.06), low evenness (E = 0.16), and high dominance (C = 1.00), indicating ecological simplification due to intensive fishing pressure. One-way ANOVA showed significant differences in mean catch weight among species (F = 14.63; p < 0.01), although most demersal and benthic taxa exhibited low and statistically similar weights. Hierarchical Cluster Analysis (HCA) revealed that species with distinct morphologies—such as crustaceans and cephalopods—clustered alongside fishes, confirming gear non-selectivity. These results underscore the need for morphology-based gear modifications, including square mesh codends and bycatch reduction devices (BRDs), to reduce ecological impacts. Integrating biological traits, species grouping, and statistical evidence provides a basis for ecosystem-based fisheries management in tropical coastal systems. ©2025 The authors.
Coastal and Marine Research Center, Brawijaya University, Malang, 65145, Indonesia; Department of Fisheries Resources Utilization and Marine, Universitas Brawijaya, Malang, 65145, Indonesia; Fisheries Resource Utilization Study Program, Faculty of Fisheries and Marine Science, Universitas Brawijaya, Malang, 65145, Indonesia; Marine Science Study Program, Faculty of Fisheries and Marine Science, Universitas Brawijaya, Malang, 65145, Indonesia; Malang Fisheries Science College / STIP, Malang, 65141, Indonesia
