Length-weight and length-length relationships, sex ratio and condition factors of the Asian striped dwarf catfish Mystus tengara (Hamilton, 1822) (Siluriformes: Bagridae) in the Ganges River, Northwestern Bangladesh

Iranian Journal of Ichthyology Pub Date : 2019-03-30 DOI:10.22034/IJI.V6I1.334

N. R. Mitu, M. M. Alam, M. A. Hussain, M. Hasan, A. Singha

引用次数: 2

Abstract

The present study describes the sex ratio (SR), distribution of length-frequency (DLF), relationship of length-weight (RLW), relationship of length-length (RLL) and condition factors of Mystus tengara , a small indigenous freshwater fish species. A total of 881 specimens ranging from 4.3-11.4 cm L T (total length) and 3.8-9.6 g WB (body weight) were investigated in the Ganges River of Rajshahi, northwestern Bangladesh from January 2010 to December 2010. The overall sex ratio showed significant differences from the expected value of 1:1 (df=1, χ2=8.9, P 0.91, distribution of length-frequency). The value of Fulton’s condition factor (KF) was ranged from 0.9 to 1.2 for male and 1.0 to 1.5 for female M. tengara . Also, relative weight (WR) was significantly higher in females (WR>100) than in males (WR<100) indicating imbalance habitat with food availability.

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孟加拉西北部恒河亚洲条纹矮鲶(Hamilton, 1822)的长重和长长关系、性别比例和条件因素

本文描述了一种小型本地淡水鱼——登加拉(Mystus tengara)的性别比(SR)、长-频分布(DLF)、长-重关系(RLW)、长-长关系(RLL)和条件因子。2010年1月至2010年12月，在孟加拉国西北部拉杰沙希的恒河中调查了881只样本，总长度为4.3-11.4 cm，体重为3.8-9.6 g。总体性别比与1:1的期望值有显著性差异(df=1， χ2=8.9, P 0.91，长度-频率分布)。雄鼠富尔顿条件因子(KF)为0.9 ~ 1.2，雌鼠为1.0 ~ 1.5。雌性相对体重(WR) (WR<100)显著高于雄性(WR<100)，表明生境与食物供应不平衡。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.