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首页> 外文期刊>Fisheries Science >Feeding behavior under dark conditions in larvae of sutchi catfish Pangasianodon hypophthalmus
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Feeding behavior under dark conditions in larvae of sutchi catfish Pangasianodon hypophthalmus

机译：暗箱条件下in鱼幼体在黑暗条件下的摄食行为

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摘要

Sutchi catfish Pangasianodon hypophthalmus hatch with morphologically immature sensory organs; however, sensory organs develop rapidly with larval growth. Two-day-old larvae commenced ingesting Artemia nauplii. The larvae displayed many taste buds on the barbels, the head surface, and in the buccal cavity. Other sense organs were also well developed at this stage. Feeding experiments revealed that 2-day-old larvae ingested Artemia under both light and dark conditions, moreover, the larvae could ingest frozen dead Artemia. The ingestion rates for 4- and 7-day-old larvae were significantly higher under dark conditions than under light conditions. The rates using frozen dead Artemia were mostly higher than the rates using live Artemia. Therefore, feeding behavior under dark conditions is most likely not mediated by visual or mechanical senses, but rather by chemosensory senses, such as taste buds. Larval fish are vulnerable to predators; thus, if they can search for and eat food at night, they can avoid diurnal predators. The behavior observed here appears to represent their survival strategy. Moreover, these results suggest a new possibility that sutchi catfish larvae can be reared under dark or dim light conditions in order to improve survival and growth rates as in the case of African catfish Clarias gariepinus.
机译：Sutchi fish鱼Pangasianodon hypophthalmus孵出，形态上未成熟的感觉器官；然而，感觉器官随着幼虫的生长而迅速发展。两天大的幼虫开始摄入无节幼体。幼虫在触须，头部表面和颊腔中显示出许多味蕾。在这个阶段，其他感觉器官也得到了很好的发展。喂食实验表明，两天大的幼虫在明亮和黑暗的条件下均会摄入卤虫，此外，该幼虫还可以吞噬冷冻的死卤虫。 4天和7天龄幼虫的摄食率在黑暗条件下明显高于在明亮条件下。使用冷冻死卤虫的比率大多数高于使用活卤虫的比率。因此，在黑暗条件下的进食行为很可能不是由视觉或机械感官来介导的，而是由化学感官（如味蕾）介导的。幼虫鱼容易被捕食者侵害。因此，如果他们可以在夜间搜寻食物并进食，则可以避免昼夜掠食者。这里观察到的行为似乎代表了他们的生存策略。此外，这些结果表明了一种新的可能性，如非洲cat鱼Clarias gariepinus的情况，可以在暗或昏暗的条件下饲养Sutchi fish鱼的幼虫，以提高存活率和生长速度。

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