The growth, mortality, and stock assessment of Arius arius were estimated based on monthly length-frequency analysis data collected from the Hooghly-Matlah estuary of West Bengal, India from April 2017 to March 2018. The estimated growth parameters were as L_∞ = 278 mm, K = 0.97 yr^-1, and t₀ = -0.0889 years. The different mortality coefficients Z, M, and F were obtained as 5.25 yr^-1, 1.79 yr^-1, and 3.46 yr^-1, respectively. The calculated exploitation ratio (E) was found as 0.66, and the M/K value as 1.845 indicating overexploitation of the fish. The recruitment was found throughout the year with two peaks and the value of L_c was found at 56.00 mm. The estimated virtual population analysis (VPA) indicated that the highest fishing mortality (F) of 3.4499 was observed at the 190-200 mm length class, followed by 3.2393 from the 180-190 mm length class. The fishery was found at the overexploitation level and measures are needed to regulate it for promoting its sustainability.

中文翻译：

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来自西孟加拉邦 Hooghly-Matlah 河口的 Arius arius（汉密尔顿，1822 年）的生长、死亡率和种群评估

根据2017 年 4 月至 2018 年 3 月从印度西孟加拉邦 Hooghly-Matlah 河口收集的月度长度频率分析数据，估计了Arius arius的生长、死亡率和种群评估。估计的生长参数为_L∞ = 278 mm，K = 0.97 年^-1和 t ₀ = -0.0889 年。获得的不同死亡率系数Z、M 和F 分别为5.25 yr ^-1、1.79 yr ^-1和3.46 yr ^-1。计算得出的开发比（E）为 0.66，M/K 值为 1.845，表明鱼类被过度开发。全年发现招聘有两个高峰，L _c值被发现在 56.00 毫米。估计的虚拟种群分析 (VPA) 表明，在 190-200 毫米长度级别观察到的最高捕捞死亡率 (F) 为 3.4499，其次是 180-190 毫米长度级别的 3.2393。该渔业处于过度开发水平，需要采取措施对其进行监管以促进其可持续性。