Stock assessment of the Indian squid Uroteuthis (Photololigo) duvaucelii off north Tamil Nadu coast from commercial trawl landings was studied during the period 2012-2016. The species is mainly caught by trawl net and the annual average landing of the species was 563.3 t contributing to 2 % to the total trawl landing along north Tamil Nadu coast. L∞, K and t₀ were estimated as 260 mm, 0.84 yr^-1 and -0.105 yr, respectively. Total mortality rate (Z), Natural mortality rate (M), and Fishing mortality rate (F) were 4.43 yr^-1, 1.67 yr^-1 and 2.78 yr^-1, respectively. t_max was estimated to be 3.47 yr. The length at first capture (Lc₅₀ = 62 mm) estimated by Length converted catch curve method was found to be lower than Length at first maturity (Lm₅₀ = 80 mm). Furthermore, E_curr (current exploitation rate) was found be on higher side than the E_max (0.48) and E_0.1 (0.40) which indicates that the fishery is in overexploited stage. Thompson and Bell prediction model showed that a marginal decrease (20 %) in current level of exploitation would help in regeneration of stock for long term sustainability of the resources as well as in achieving maximized economic return.

中文翻译：

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来自孟加拉西南部湾的印度鱿鱼Uroteuthis（Photololigo）duvaucelii（d'Orbigny，[Férussac和d'Orbigny]，1835年）的种群评估

在2012-2016年期间，对泰米尔纳德邦北部沿海商业拖网捕捞的印度鱿鱼Uroteuthis（Photololigo）duvaucelii进行了种群评估。该物种主要被拖网捕捞，该物种的年平均着陆量为563.3 t，占泰米尔纳德邦北部沿海拖网总着陆量的2％。L∞，K和t ₀分别估计为260 mm，0.84 yr ^-1和-0.105 yr。总死亡率（Z），自然死亡率（M）和捕捞死亡率（F）分别为4.43年- ¹，¹ .67年^-1和2.78年^-1。t _max估计为3。47年。第一次拍摄时的长度（Lc ₅₀通过“长度转换捕捉曲线”方法估算出的长度= 62 mm）小于第一次成熟时的长度（Lm ₅₀ = 80 mm）。此外，发现E _curr（当前开采率）高于E _max（0.48）和E _0.1（0.40），这表明渔业处于过度开发阶段。汤普森和贝尔的预测模型表明，当前开采水平的边际下降（20％）将有助于资源的长期资源可持续性的库存再生和最大程度的经济回报。