Feeding indices of Isfahan toothcarp (Aphanius isfahanensis) in Zayandeh River in Iran (Teleostei: Aphaniidae)

Iranian Journal of Ichthyology Pub Date : 2018-10-05 DOI:10.22034/IJI.V5I3.262

Z. Ghafoori, Y. Keivany, N. Soofiani

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引用次数: 1

Abstract

The feeding characteristics of Aphanius isfahanensis in the Zayandeh River of Isfahan Province were studied by collecting 440 specimens (220 males and 220 females) from July 2016 to May 2017. The specimens were anesthetized in 1% clove oil, fixed in 10% buffered formalin and transferred to the laboratory. The average condition factor for males was 1.7, for female 1.26 and showed significant difference between different months in both sexes ( P <0.05). The average length and weight for all specimens were 38.57±5.24mm and 1.00±0.41g, respectively. The average length of gut (RLG) for all fish was 0.54±0.17 during the year. The mean RLG in different length classes showed significant differences ( P <0.05). The highest Gastrosomatic Index value was in July (0.05) and the lowest in August (0.03) and showed significant differences in different months ( P <0.05). A total of 181 empty stomachs were observed amongst the 440 fish and there were significant differences in different months ( P <0.05). Therefore, it can be concluded that this is a carnivorous fish (mainly aquatic insect larvae) with a modest feeding throughout the year.

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伊朗Zayandeh河伊斯法罕齿蚜（Aphanius isfahanensis）的摄食指标

2016年7月至2017年5月，在伊斯法罕省Zayandeh河采集了440只雄性和220只雌性阿法哈尼(Aphanius isfahanensis)标本，对其摄食特征进行了研究。标本用1%丁香油麻醉，用10%福尔马林缓冲液固定，移送实验室。男性平均病情因子为1.7，女性平均病情因子为1.26，不同月份间男女差异有统计学意义(P <0.05)。所有标本的平均长度和重量分别为38.57±5.24mm和1.00±0.41g。全年平均肠道长度(RLG)为0.54±0.17。不同长度组别的平均RLG差异有统计学意义(P <0.05)。胃体指数以7月最高(0.05)，8月最低(0.03)，且各月份间差异显著(P <0.05)。440尾鱼共出现181只空胃，不同月份间差异显著(P <0.05)。因此，可以得出结论，这是一种食肉鱼(主要是水生昆虫幼虫)，全年摄食适度。

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来源期刊

Iranian Journal of Ichthyology Agricultural and Biological Sciences-Aquatic Science

CiteScore

0.70

自引率

0.00%

发文量

期刊介绍： Iranian Journal of Ichthyology (IJI) is a peer-reviewed journal for publication of high quality papers on any aspect of ichthyology and will be published 4 times a year by the Iranian Society of Ichthyology (http://www.isi-org.ir). The journal welcomes the submission of manuscripts that meets the general criteria of significance and scientific excellence, and will publish original scientific articles in the fields of ichthyology. The editors welcome the submission of original manuscripts including Research Articles, Short communications, and Views & News. Review papers by distinguished authors and Special Issues will also be considered. It is our aim to provide the international scientific community with an efficiently published journal, meeting high scientific and technical standards. Scopes of Iranian Journal of Ichthyology includes: Systematics, taxonomy, morphology, anatomy, biogeography, biodiversity, conservation, ecology and general biology of fishes (reproduction, food and feeding habits, age and growth, population dynamics, etc.). Papers on freshwater, brackish, marine and fossil fishes will be considered.