Rana Saifuddin, Hasan Md Nazmul, Sultana Nargis, Hasan Shanur Jahedul, Shimul Shahida Arfine, Nahid Sk Ahmad Al
Department of Fisheries Resource Management, Faculty of Fisheries, Chattogram Veterinary and Animal Sciences University, Khulshi-4225, Chattogram, Bangladesh.
Department of Oceanography, Faculty of Marine Sciences and Fisheries, University of Chittagong, Chittagong-4331, Bangladesh.
Heliyon. 2023 Apr 27;9(5):e15855. doi: 10.1016/j.heliyon.2023.e15855. eCollection 2023 May.
Ocean acidification is caused mainly by atmospheric carbon dioxide stored in the ocean. Ocean acidification is considered a major threat to aquatic life, and how it influences the abundance of marine fish larvae is still unclear. This research was designed to measure the current ocean acidification scenario of the Cox's Bazar coast of the Bay of Bengal, Bangladesh, and its probable influence on the abundance of fish larvae. Three research stations were selected: Bakkhali river estuary, Naf river estuary, and Rezu Khal. Monthly sampling was done, and larvae sample was collected from the surface water column (depth: 0.5 m) using a bongo net. Water parameters such as temperature, salinity, total alkalinity, and pH were determined using laboratory protocol. The seacarb package of the R programming language was used to determine ocean acidification factors. The Bakkhali river estuary showed the highest partial carbon dioxide (143.99 ± 102.27 μatm) and the lowest pH (8.27 ± 0.21). A total of 19 larvae families were identified, and the highest larval count was found in Rezu Khal (390 larvae/1000 m), while the lowest was found in the Bakkhali river (3 larvae/1000 m). Clupeidae, Myctophidae, and Engraulidae comprised more than 50% of the identified larvae. Blenniidae, Carangidae, Clupeidae, Engraulidae, and Gobiidae were found in all three seasons. Most of the larvae families showed the highest mean abundance under less pCO A negative correlation was observed between larvae and acidification factors such as pCO, HCO, and dissolved inorganic carbon (DIC). The study revealed that acidification parameters of the Cox's Bazar coast were not in an acute state for the aquatic organisms' survival, but fish larvae abundance could be declined with raises in the partial carbon dioxide. The results of this study may aid in developing a management plan for conserving Bangladesh's marine and coastal fish.
海洋酸化主要是由海洋中储存的大气二氧化碳引起的。海洋酸化被认为是对水生生物的一个主要威胁，而它如何影响海洋鱼类幼体的数量仍不清楚。本研究旨在测量孟加拉国孟加拉湾科克斯巴扎尔海岸当前的海洋酸化情况及其对鱼类幼体数量的可能影响。选择了三个研究站点：巴克哈利河河口、纳夫河河口和雷祖河。每月进行采样，并使用邦戈网从表层水柱（深度：0.5米）采集幼体样本。使用实验室规程测定温度、盐度、总碱度和pH等水参数。使用R编程语言的seacarb包来确定海洋酸化因素。巴克哈利河河口的二氧化碳分压最高（143.99±102.27微大气压），pH最低（8.27±0.21）。共鉴定出19个幼体科，雷祖河的幼体数量最多（390个幼体/1000米），而巴克哈利河的幼体数量最少（3个幼体/1000米）。鲱科、灯笼鱼科和鳀科占已鉴定幼体的50%以上。在所有三个季节都发现了鳚科、鲹科、鲱科、鳀科和虾虎鱼科。大多数幼体科在较低的二氧化碳分压下平均丰度最高。在幼体与二氧化碳分压、碳酸氢根和溶解无机碳（DIC）等酸化因素之间观察到负相关。研究表明，科克斯巴扎尔海岸的酸化参数对水生生物的生存并非处于急性状态，但随着二氧化碳分压的升高，鱼类幼体数量可能会下降。本研究结果可能有助于制定一项保护孟加拉国海洋和沿海鱼类的管理计划。
