Ayalew Tilahun, Teshome Marishet, Aemro Degsera
Department of Animal Sciences, College of Agriculture and Natural Resources, Assosa University, 18, Assosa, Ethiopia.
Department of Fisheries & Aquatic Sciences, College of Agriculture and Environmental Sciences, Bahir Dar University, Bahir Dar, 5501, Ethiopia.
Heliyon. 2025 Feb 10;11(4):e42596. doi: 10.1016/j.heliyon.2025.e42596. eCollection 2025 Feb 28.
The study was conducted to investigate the food and feeding habits of , in Lake Ardibo, Ethiopia during dry (February-March) and wet (July-August) months in 2023. Specimens were collected by gillnets of various stretched mesh sizes. The gut contents were analyzed using frequency of occurrences and volumetric methods. A total of 915 specimens were collected; of which 605 (66.12 %) guts contained food. The most frequently occurring prey items were (72.72 %), phytoplankton (66.77 %), detritus (66.77 %), and macrophyte (39 %). Volumetrically, zooplankton (36.27 %), phytoplankton (31.41 %), macrophyte (15.08 %), and detritus (14.81 %) were most important. Frequency occurrences of phytoplankton and zooplankton varied significantly ) between dry and wet months. The volumetric contribution of phytoplankton, zooplankton, macrophytes, and detritus varied significantly ( test, p < 0.05) in dry and wet months. Schoner Diet Overlap Index revealed there were no significant dietary shifts between juveniles and adults. Based on the result of gut contents; showed omnivorous feeding behavior. This investigation is important to understanding the prey-predator relationship and conserving the prey types for optimum production.
本研究旨在调查2023年埃塞俄比亚阿迪博湖在旱季（2月至3月）和雨季（7月至8月）期间 的食物和摄食习性。通过不同拉伸网目的刺网收集标本。采用出现频率法和体积法对肠道内容物进行分析。共收集到915个标本；其中605个（66.12%）的肠道含有食物。最常出现的猎物是 （72.72%）、浮游植物（66.77%）、碎屑（66.77%）和大型植物（39%）。从体积上看，浮游动物（36.27%）、浮游植物（31.41%）、大型植物（15.08%）和碎屑（14.81%）最为重要。浮游植物和浮游动物的出现频率在旱季和雨季之间有显著差异 。浮游植物、浮游动物、大型植物和碎屑的体积贡献在旱季和雨季之间有显著差异（ 检验，p < 0.05）。肖纳饮食重叠指数显示幼体和成体之间没有显著的饮食变化。根据肠道内容物的结果； 表现出杂食性摄食行为。这项调查对于理解捕食者与猎物的关系以及保护猎物类型以实现最佳产量非常重要。
