Brown shrimp, Metapenaeus monoceros is a major contributor of shrimp trawling in Bangladesh marine waters. This is a key fisheries item owing of its fast growth and short life span. Though, stock assessment is need to be conducted annually, the present study is the maiden effort on the assessment of the stock of M. monoceros in marine waters of Bangladesh. Catch per unit effort (CPUE), the most common pieces of information was taken from trawl catch log between 1986 and 2017 for assessing the status of brown shrimp stock using Schaefer biomass model through MS-Excel and CMSY/BSM interfaces. The standing stock and fishing mortality were assessed to be around 5960 t and 43 %, respectively. The calculated reference points of maximum sustainable yield (MSY) with 95 % confidence interval are optimum biomass BMSY 5060 t (4190-6110 t) and optimum fishing mortality FMSY = 61 % (51-63 %). The average annual catch of last two decades was 2793 t, below assessed MSY of 3090 t (2920-3260 t). The stock is probably going to be of satisfactory size with sustainable exploitation close to MSY. Thus, management would be well advised not let to increase catches but to maintain them at the current level.

中文翻译：

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使用拖网捕捞记录法对孟加拉国海水中的褐对虾，Metapenaeus monoceros（Fabricius 1798）的最大可持续产量估算

褐虾Metapenaeus monoceros是孟加拉国海水拖网虾的主要贡献者。由于其快速生长和短寿命，这是一个关键的渔业项目。尽管每年都需要进行种群评估，但是本研究是对孟加拉国海水中的单角甲烷八叠球菌种群评估的首次努力。单位捕捞量（CPUE），最常见的信息来自1986年至2017年之间的拖网捕捞日志，用于通过MS-Excel和CMSY / BSM界面使用Schaefer生物量模型评估褐虾种群的状况。库存量和捕捞死亡率分别约为5960吨和43％。以95％置信区间计算的最大可持续产量（MSY）的参考点是最佳生物量BMSY 5060 t（4190-6110 t）和最佳捕捞死亡率FMSY = 61％（51-63％）。最近二十年的年平均捕捞量为2793吨，低于MSY评估的3090吨（2920-3260吨）。库存量可能会达到令人满意的水平，并且可持续开采接近MSY。因此，不建议管理层增加产量，而应将其保持在目前水平。