State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China; Laboratory for Marine Fisheries Science and Food Production Processes, Laoshan Laboratory, Qingdao, 266200, China.
CESAM & Department of Biology, University of Aveiro, Aveiro, 3810-193, Portugal.
Mar Environ Res. 2023 Sep;190:106117. doi: 10.1016/j.marenvres.2023.106117. Epub 2023 Jul 25.
The Ria de Aveiro is an important coastal lagoon for wildlife in Portugal, where the production of bivalves reaches approximately 2700 tons annually. However, the illegal overfishing of bivalves is frequent in this lagoon, which causes critical changes in the ecosystem. In this study, using a developed food-web model (Ecopath model), the ecological carrying capacity (ECC) and maximum sustained yield (MSY) of the Manila clam, Ruditapes philippinarum were estimated, and the effects of further increases in clam biomass on other species were investigated. The results showed that 1) the current biomass and legal catch of R. philippinarum do not yet exceed the ECC (172.40 tons km) or the MSY (86.20 tons km year) in Ria de Aveiro; 2) the harvested Manila clams of the MSY represent removing from the ecosystem ∼ 581 tons carbon (C) and ∼83 tons nitrogen (N) annually, with substantial ecological and economic implications; and 3) a further increase in the biomass levels of this species may cause the ecotrophic efficiency of other groups to become unrealistic, potentially leading to decreases in ecosystem transfer efficiency, biodiversity and health. The results here are expected to guide the sustainable development and management of bivalve aquaculture in Ria de Aveiro and the protection of the local environment.
阿威罗泻湖是葡萄牙重要的沿海湿地，贝类产量约为 2700 吨/年。然而，该泻湖贝类非法过度捕捞现象频繁，对生态系统造成严重影响。本研究采用开发的食物网模型（Ecopath 模型），评估了菲律宾蛤仔（Ruditapes philippinarum）的生态承载能力（ECC）和最大可持续产量（MSY），并研究了进一步增加蛤仔生物量对其他物种的影响。结果表明：1）阿威罗泻湖目前的菲律宾蛤仔生物量和合法捕捞量尚未超过生态承载能力（172.40 吨/平方公里）或最大可持续产量（86.20 吨/平方公里·年）；2）MSY 下的马尼拉蛤仔捕捞每年从生态系统中移除约 581 吨碳（C）和 83 吨氮（N），具有重要的生态和经济意义；3）该物种生物量的进一步增加可能导致其他群体的生态营养效率变得不切实际，从而可能导致生态系统转移效率、生物多样性和健康水平下降。本研究结果有望为阿威罗泻湖贝类养殖的可持续发展和管理以及当地环境的保护提供指导。
