Seabass recapture data in Tokyo Bay by Japan Game Fish Association (edited and filtered version)
Data files
May 01, 2026 version files 313.92 KB
-
MeshMap.pdf
277.17 KB
-
README.md
2.19 KB
-
RecaptureData.csv
34.56 KB
Abstract
This dataset provides individual-level tag and recapture records of Japanese seabass (Lateolabrax japonicus) collected through an angler-based tagging program conducted by the Japan Game Fish Association from 1987 to 2023 in Tokyo Bay, Japan. A total of 664 recapture cases are included after data filtering, as described in the associated publication. Each record contains information on tag ID, dates, and fork lengths at release and recapture, and geographic locations coded by a custom mesh grid system designed for spatial analysis within Tokyo Bay. Approximately 98% seabass released in Tokyo Bay remained within the bay or its inflowing rivers. These data were used to estimate growth rates across decades using the GROTAG model and generalized additive models, which revealed size-specific temporal shifts in growth patterns. The dataset is suitable for reuse in studies related to seabass growth and migration ecology.
This dataset includes tag and recapture records of Japanese seabass (Lateolabrax japonicus) collected by the Japan Game Fish Association. This dataset is an edited and filtered version of the raw data, following the methodology described in the associated publication.
Description of the data and file structure
This dataset contains the following two files:
RecaptureData.csv
Individual-level records of seabass recapture events. Recapture events identify (ID), tag number (Tag), date at release, FL at release, release area, date at recapture, FL at recapture, and recapture area are shown.MeshMap.pdf
Numbering of the mesh map in Tokyo Bay. The mesh grids are defined based on the southern boundary point on the western side of Tokyo Bay (35°08'00.0"N, 139°37'00.0"E), with a latitude interval of 0.09° and a longitude interval of 0.11°.
Relationships between files
The Recapture Area column in RecaptureData.csv contains numerical mesh IDs, which correspond to the numbering in MeshMap.pdf.
Variable definitions and codes
- Key variables include:
ID: Unique identifier for each recapture eventTag: Unique identifier for each tagDate at release,Date at recapture: Dates of release (tagging) and recaptureFL at release,FL at recapture: Fork length (cm) at time of release and recapture used in the growth analyses. These values include both originally reported data and those converted from total length.Release area,Recapture area: Area code where the release/recapture event was conducted. Release and recapture areas for which latitude and longitude coordinates were specifically detected are represented by the mesh numbers shown inMeshMap.pdf. Other areas are expressed as TB (inner Tokyo Bay), E (outer eastern part of Tokyo Bay), W (outer western part of Tokyo Bay), or unknown.Growth analyses: Indicator showing whether each individual was included in the growth analyses. A check mark (✓) means the individual was used in the analysis; blank cells indicate it was not used.