| 元江越鳠的食性研究 |
| Feeding Habits of Hemibagrus pluriradiatus (Vaillant) in Yuanjiang River |
| 投稿时间：2010-05-07 修订日期：2010-06-05 |
| DOI： |
| 中文关键词:越鳠 食性 食物组成 摄食强度 摄食形态学 季节变化 元江 |
| 英文关键词:Hemibagrus pluriradiatus (Vaillant) feeding habit food composition feeding intensity feeding morphology seasonal variation Yuanjiang River |
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| 中文摘要: |
| 研究了越!的食物组成、摄食强度和摄食形态学。样本２５１尾，２００８年６月～２００９年５月采自云南元江。结果表明：越!的食物由水生昆虫幼虫和小型鱼类等１５类组成，水生昆虫幼虫和小型鱼类的出现率分别为７３８％和６４．２％，所占比重分别为４０．０％和４６．９％，小型鱼类和水生昆虫幼虫为越!的主要食物。随着体长增加，食物类别减少，摄食强度降低；水生昆虫幼虫的出现率降低，成虫出现率增加；体长１６０ｍｍ以上个体胃中出现陆生昆虫且其出现率持续上升。食物组成的季节变化明显，摄食强度的季节变化不明显。越!是一种偏肉食性的杂食性鱼类，主要摄食底层小型鱼类和水生昆虫幼虫。 |
| 英文摘要: |
| This paper dealed with the food composition，feeding intensity and feeding morphology of Hemibagrus pluriradiatus(Vaillant). 251 individuals，with body-length ranging from 109 mm to 295 mm and body-weight ranging from 14.6g to 273.5g，caught by electric shock from Yuanjiang River in Yunnan Province，China，from June 2008 to May 2009，were analyzed. The results showed that H. pluriradiatus is a euryphagous fish feeding on a wide range of food items including small fish(mainly loaches)，aquatic insect larvae(mainly Cybister)，aquatic and terrestrial insects，mollusc，annelida，crustacean，fish eggs，frogs，rotifers，cladoceran，copepoda，cereals，macrophytes，algae and etc. Small fish had an average occurrence rate of 64.2% and accounted for 46. 90% in weight in the stomach content. Aquatic insect larvae had an average occurrence rate of 73.8% and accounted for 40. 00% in weight together with insect imago. This indicated that small fish and aquatic insect larvae were the most important food items for H. pluriradiatus. H. pluriradiatus is also a guttler. Its stomach fillness index can reach 11 .6%-16.2% at satiation. As the body-length increase，its food composition simplified and feeding intensity decreased，the occurrence rate of aquatic insect larvae decreased and of imago increased. Terrestrial insects appeared in the stomach of individuals with body-length over 160 mm. The seasonal variation of food composition was obvious while that of feeding intensities was less obvious. In conclusion，H. pluriradiatus though it takes in more animal food，is a bottom feeder omnivore. |
| 杜孝田,朱邦科,张家波,田志福.2010.元江越鳠的食性研究[J].水生态学杂志,31(5):38-43. |
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