https://ipt.taibif.tw/resource?r=owf-fish_cyr Meng-Hsien Chen Department of Oceanography Professor

70, Leihai Rd, Gushen Dist. Kaohsiung TW

mhchen@mail.nsysu.edu.tw 0000-0002-1868-7061 Chien Cheng Lai Department of Oceanography research assistant

70, Leihai Rd, Gushen Dist. Kaohsiung TW

visxit00@gmail.com Meng-Hsien Chen Department of Oceanography Professor

70, Leihai Rd, Gushen Dist. Kaohsiung TW

mhchen@mail.nsysu.edu.tw 0000-0002-1868-7061 principalInvestigator Chien Cheng Lai Department of Oceanography research assistant

70, Leihai Rd, Gushen Dist. Kaohsiung TW

visxit00@gmail.com author Kuo-Shu Chen National Academy of Marine Research Associate research fellow

11F., No. 25, Chenggong 2nd Rd., Qianzhen Dist. Kaohsiung TW

kuoshuchen@namr.gov.tw author Chih-Wei Chang National Academy of Marine Research Research fellow

11F., No. 25, Chenggong 2nd Rd., Qianzhen Dist. Kaohsiung TW

changcw@namr.gov.tw author 2023-07-03 eng 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. Samplingevent; Changyun Rise; fish assemblages; baseline; wind farm GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type_2015-07-10.xml This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License. Sampling was conducted at two sites off Changhua, central western Taiwan. 119.996 120.291 24.136 24.032 2017-07-05 2021-09-02 N/A family Sciaenidae family Platycephalidae family Synodontidae family Rhynchobatidae family Mullidae order Torpediniformes family Ariidae family Dasyatidae family Fistulariidae family Triacanthidae family Carangidae family Ophichthidae order Scorpaeniformes kingdom Animalia phylum Chordata  order Perciformes order Gasterosteiformes family Leiognathidae family Ephippidae family Diodontidae order Anguilliformes family Narcinidae family Cynoglossidae family Soleidae order Aulopiformes order Pleuronectiformes family Tetraodontidae class Actinopterygii order Tetraodontiformes class Chondrichthyes order Myliobatiformes family Sillaginidae order Rajiformes order Siluriformes irregular Meng-Hsien Chen Department of Oceanography Professor

70, Leihai Rd, Gushen Dist. Kaohsiung TW

mhchen@mail.nsysu.edu.tw 0000-0002-1868-7061 The fish specimens caught by each trawl haul were immediately extracted from the catches, roughly classified by species and frozen at − 20°C on board. Subsequently, all fish specimens were transferred to the laboratory on land for taxonomic identification. Commercial otter trawler , a common practice in Changyun Rise (CYR), was conducted at two sites off Changhua, central western Taiwan. These include an inshore site (FS20) with a water depth of 15-25 meters (approx. 24°02'N, 120°16'E) and an offshore site (FS40) with a water depth of 40-50 meters (approx. 24°06'N, 120°00'E). Surveys were carried out during daytime using a local commercial otter trawler, with a width of 8 m, body length of 70 m, body mesh size of 7 cm, and cod end mesh size of 4 cm. The trawler was operated at water depths ranging from 15-25 m at the inshore site, approximately 9 km off the coastline, and 40-50 m at the offshore site, approximately 42 km off the coastline. Trawling was conducted at a speed of 3-4 knots for 20 minutes at each site. The biological samples were identified to the lowest taxa according to Chen et al. (2019), Froese & Pauly (2021), and Shao (2021). 2023-07-03T15:52:59.331+08:00 dataset Chen M (2023): Otter trawling fish assemblages at the Changyun Rise off central western Taiwan in 2017-2021. v1.1. Department of Oceanography, National Sun Yat-sen University, Kaohsiung Taiwan. Dataset/Samplingevent. https://ipt.taibif.tw/resource?r=owf-fish_cyr&v=1.1 https://ipt.taibif.tw/resource?id=owf-fish_cyr/v1.1.xml