Harpadon nehereus (Hamilton, 1822), commercially known as Bombay duck and is locally named as 'Bumla' or 'Bombil' along the western coast of India. The area between northern geographical coordinates of 18° and 22° N represents intermittent fishery resources with discontinuous distribution, and the majority of the resources are caught by the 'dol net'. The present study revealed information on 1523 specimens of Bombay duck, which were used for the analysis of length-weight relationship (LWR), and condition factor (K) collected from various fishing villages of west coast of India during September 2014 to November 2016. The results indicated that females bear longer and heavier body sizes than males. The analysis of LWR shows exponent 'b' values of 3.03 for males indicating isometric growth and female (3.10) establish growth as positive allometric (b > 3). A significant dissimilarity is observed in 'b' values among the seasons for Bombay duck (P < 0.05). The ‘b’ value was highest during summer (3.37), followed by winter (3.22), autumn (3.20), and monsoon season showed the lowest value, i.e., 2.95, indicating higher growth during the summer season in terms of weight. The Kn value observed in the present investigation was 1.02 ± 0.21. Information from the field for this species is rare, and the outcomes of the present study will help the administration in conservation of H. nehereus fishery in its natural range.

中文翻译：

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居住在印度西海岸海域的孟买鸭，Harpadon nehereus（汉密尔顿，1822年）（Aulopiformes：Synodontidae）的长度-重量关系和相对条件因子的季节性变化

Harpadon nehereus （汉密尔顿，1822年），商业上称为孟买鸭，在印度西海岸沿途被当地称为“ Bumla”或“ Bombil”。北部地理坐标介于北纬18°和22°之间的区域表示间歇性渔业资源，分布不连续，大部分资源被“海豚网”捕获。本研究揭示了孟买鸭1523个标本的信息，这些标本用于分析2014年9月至2016年11月从印度西海岸各个渔村收集的长体重关系（LWR）和条件因子（K）。结果表明，雌性比雄性具有更长和更重的体型。LWR的分析显示，男性的等距增长指数为3.03，女性的指数为b（3.0。10）将生长确定为正异速生长（b> 3）。在孟买鸭的季节中，“ b”值存在显着差异（P <0.05）。“ b”值在夏季（3.37）最高，其次是冬季（3.22），秋季（3.20）和季风季节显示最低值，即2.95，表明夏季在重量方面增长更高。在本研究中观察到的Kn值为1.02±0.21。从该物种的田间获得的信息很少，本研究的结果将有助于行政管理其在自然范围内的H. nehereus渔业。