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.
The data in this sampling event resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 20 records.
1 extension data tables also exist. An extension record supplies extra information about a core record. The number of records in each extension data table is illustrated below.
This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.
The table below shows only published versions of the resource that are publicly accessible.
How to cite
Researchers should cite this work as follows:
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
Researchers should respect the following rights statement:
The publisher and rights holder of this work is Department of Oceanography, National Sun Yat-sen University, Kaohsiung Taiwan. This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License.
This resource has been registered with GBIF, and assigned the following GBIF UUID: 00647bc1-bca9-4247-ab28-e1ef81fcbc93. Department of Oceanography, National Sun Yat-sen University, Kaohsiung Taiwan publishes this resource, and is itself registered in GBIF as a data publisher endorsed by Taiwan Biodiversity Information Facility.
Samplingevent; Changyun Rise; fish assemblages; baseline; wind farm
- Metadata Provider ●
Sampling was conducted at two sites off Changhua, central western Taiwan.
|Bounding Coordinates||South West [24.032, 119.996], North East [24.136, 120.291]|
|Order||Torpediniformes, Scorpaeniformes, Perciformes, Gasterosteiformes, Anguilliformes, Aulopiformes, Pleuronectiformes, Tetraodontiformes, Myliobatiformes, Rajiformes, Siluriformes|
|Family||Sciaenidae, Platycephalidae, Synodontidae, Rhynchobatidae, Mullidae, Ariidae, Dasyatidae, Fistulariidae, Triacanthidae, Carangidae, Ophichthidae, Leiognathidae, Ephippidae, Diodontidae, Narcinidae, Cynoglossidae, Soleidae, Tetraodontidae, Sillaginidae|
|Start Date / End Date||2017-07-05 / 2021-09-02|
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.
|Study Extent||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).|
|Quality Control||The biological samples were identified to the lowest taxa according to Chen et al. (2019), Froese & Pauly (2021), and Shao (2021).|
Method step description:
- 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.