ABSTRACT The present study investigates the diet composition and the feeding strategy of Kalyptodoras bahiensis by verifying variations during the hydrological cycle and between males and females. Samples were collected during the periods of rain and drought using various fishing gears adapted to each microhabitat. In laboratory, the fishes were weighed and measured. An abdominal incision was made to observe the gonads for sex determination and the stomach was removed for identification and quantification of food items. The importance of each item in the diet was calculated using the Feeding Index. Amundsen graphic analysis was used to define the feeding strategy. Kalyptodoras bahiensis was classified as an omnivorous species with an invertivorous tendency. The species presented a generalist feeding strategy and many individuals fed on Melanoides tuberculatus, an exotic mollusk that has spread to Brazilian rivers, causing damages to the native community. The high amount and frequency of M. tuberculatus in the diet of K. bahiensis suggest that the species may have a predatory impact on the local population of this mollusk. However, further studies are needed to better understand the interaction between K. bahiensis and M. tuberculatus.

中文翻译：

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来自巴西巴伊亚州巴拉瓜苏河的濒危新热带鲶鱼 (Kalyptodoras bahiensis) 的饮食

摘要 本研究通过验证水文循环过程中以及雄性和雌性之间的变化，研究了 Kalyptodoras bahiensis 的饮食组成和摄食策略。在雨季和干旱期间使用适合每个微生境的各种渔具收集样品。在实验室中，对鱼进行称重和测量。做腹部切口观察性腺以确定性别，取出胃用于识别和量化食物项目。使用喂养指数计算饮食中每个项目的重要性。阿蒙森图形分析用于定义喂养策略。Kalyptodoras bahiensis 被归类为具有倒食倾向的杂食性物种。该物种提出了一种多面手的喂养策略，许多个体以结核结节菌为食，这是一种异国情调的软体动物，已经蔓延到巴西河流，对当地社区造成了损害。K. bahiensis 饮食中结核分枝杆菌的数量和频率很高，这表明该物种可能对这种软体动物的当地种群具有捕食性影响。然而，需要进一步的研究来更好地了解 K. bahiensis 和 M. tuberculatus 之间的相互作用。