Nurfadillah Nurfadillah, Nur Fadli, Zulkarnain Jalil, Noor Adelyna Mohammed Akib
Feeding habits and growth patterns of fish in lake ecosystems are influenced by food availability, competition, predation, and environmental conditions. This study aimed to analyze the feeding habits and length-weight relationships of native and invasive fish species in Aneuk Laot Lake, Sabang, Indonesia. Fish were sampled using traps and gill nets with mesh sizes of 0.5, 0.75, and 1 inch. A total of 483 fish were collected: 98 Rasbora sp., 104 Barbodes sp., and 218 Amphilophus trimaculatus. Feeding habits were examined using the digestive tract dissection method, and the data were analyzed based on the volumetric index, frequency of occurrence, index of preponderance, niche breadth, and niche overlap. Growth patterns were assessed through length-weight relationship analysis using linear regression and t-test analysis. Results indicated that Rasbora sp. is herbivorous, primarily consuming Cosmarium sp. (84.4%), whereas Barbodes sp. preferred Daphnia sp. (45.1%). A. trimaculatus primarily preys on small fish (62.5%). Both Barbodes sp. and A. trimaculatus are omnivorous. There was a high dietary overlap (0.96) between Rasbora sp. and Barbodes sp., indicating strong interspecific competition. A. trimaculatus preys on Rasbora sp., demonstrating its impact as an invasive predator. All species exhibited negative allometric growth (b < 3), suggesting environmental stress or food limitations. These findings highlight the need for managing invasive species to conserve native fish populations and maintain ecological balance. ©2025 The authors.
Graduate School of Mathematics and Applied Sciences, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia; Department of Aquaculture, Faculty of Marine and Fisheries, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia; Department of Marine Science, Faculty of Marine and Fisheries, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia; Physics Department, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia; School of Biological Sciences, Universiti Sains Malaysia, Gelugor, 11800, Malaysia
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