Bombay duck, Harpadon nehereus (Hamilton, 1822), harvested mainly by dol nets, has been a prolific fishery in the northern Arabian Sea. Monthly length composition data for H. nehereus, landed at the Karachi Fish Harbor (KFH) from July 2014 to June 2015 was used to determine growth, mortality and stock evaluation. Total 2252 specimen with an average of 19.171 ± 2.659 cm TL (14 to 28 cm total length), an average of 45.254 ± 23.113 g of 9 to 174 g (total body weight) analyzed. The data used in FiSAT-II applying ELEFAN-I package for estimating population dynamics. The estimated the growth parameters of von Bertalanffy L∞ = 29.40 cm, K = 0.610 year^-1 and t₀ = -0.359 year^-1 with a phi φ’ = 2.722. The length-weight relationship was W = 0.001L^3.477 (R² = 0.918) and b > 3 is described as positive allometric growth. Total mortality was calculated at Z = 1.800 year^-1, natural mortality estimated at M = 1.276 year^-1 at 27 °C in addition, fishing mortality rate was 0.524 year^-1 is not much higher than the safe level (F_opt = 0.638 year^-1) and a little below edge (Fl_imit = 0.850 year^-1) biological reference points. Due to mortality and exploitation rate (E = 0.291 < 0.50), the population stock and reserves were underutilized.

中文翻译：

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巴基斯坦沿海水域中孟买鸭（Harpodon nehereus Hamilton，1822年）渔业的资源评估，种群，生长和死亡率

孟买鸭，Harpadon nehereus（汉密尔顿，1822年），主要通过海豚网捕捞，是阿拉伯海北部多产的渔业。使用2014年7月至2015年6月登陆卡拉奇鱼港（KFH）的H. nehereus的月长组成数据来确定生长，死亡率和种群评估。总共2252个标本，平均长度为19.171±2.659厘米TL（全长14至28厘米），平均质量为45.254±23.113克（9至174克）（总体重）。FiSAT-II中使用ELEFAN-I软件包估算种群动态的数据。von Bertalanffy的估计生长参数L∞= 29.40 cm，K = 0.610 year ^-1和t ₀ = -0.359 year ^-1φ'= 2.722。长度-重量关系为W = ^{0.001L 3.477}（R ² = 0.918），b> 3被描述为正异速生长。总死亡率在Z = 1.800 year ^-1时计算得出，自然死亡率在27°C时在M = 1.276 year ^-1估计，此外，捕鱼死亡率为0.524 year ^-1并不比安全水平高很多（F _opt = 0.638） - ^1年）和略低于边缘的水平（_Flimit = 0.850 - ^1年）生物学参考点。由于死亡率和开发率（E = 0.291 <0.50），人口存量和储备未得到充分利用。