Otter trawling fish assemblages at the Changyun Rise off central western Taiwan in 2017-2021

This dataset is derived from ten surveys with a total of 20 otter trawling sessions conducted at the Changyun Rise off the western coast of Taiwan between 2017-2018 and 2020-2021. The surveys were conducted at two sites, inshore (15-25 m depth) and offshore (40-50 m depth), utilizing a commercial otter trawling boat prior to the commencement of the offshore wind farm development. The dataset includes 8,026 individual fish, encompassing 51 families, 84 genera, and 128 taxa. Not only did the composition and abundance (ind./104m2) of fish species significantly differ between the inshore and offshore sites, but spatiotemporal variation was also observed in dominant fish species between 2017-2018 and 2020-2021. This dataset serves as a baseline for demersal fish prior to the development of the Changhua offshore wind farm. It offers critical information for subsequent environmental impact assessments, proposing mitigation measures, and establishing continuous monitoring networks.

本数据集源自10项调查作业，于2017-2018年及2020-2021年间在台湾西海岸外海的长云海隆（Changyun Rise）开展，累计完成20次底拖网（otter trawling）作业。调查设置近岸（水深15-25米）与外海（水深40-50米）两个采样站点，于彰化海上风电场开工前，依托商用底拖网渔船完成采样工作。本数据集共收录8026尾鱼类个体，涵盖51科、84属及128个分类单元。研究表明，近岸与外海站点的鱼类群落组成与丰度（单位：个体/10^4平方米）存在显著差异；且2017-2018年与2020-2021年间的优势鱼类物种亦呈现出时空分布变异。本数据集可作为彰化海上风电场开发前的底栖鱼类（demersal fish）本底基准数据，可为后续环境影响评估、减缓措施制定以及持续监测网络构建提供关键支撑信息。