/DigitizingNishikawa

Repository for Digitizing Nishikawa et al (1985) Data

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DigitizingNishikawa

Repository for Digitizing Nishikawa et al (1985) Data

This repository digitizes average spawning ground data on the following species from 1956-1981:

  1. Yellowfin tuna
  2. Swordfish
  3. Albacore
  4. Skipjack tuna
  5. Blujefin tuna
  6. Southern bluefin tuna
  7. Bigeye tuna
  8. Blue marlin
  9. Black marlin
  10. Striped marlin
  11. Sailfish
  12. Shortbill spearfish
  13. Frigate tuna
  14. Little tuna
  15. Bonitos
  16. Slender tuna
  17. Longfin escolar
  18. Sauries

Tows were done seasonally (Jan-Mar, Apr-Jun, Jul-Sept, Oct-Dec).

Number of tows and volumes of water strained are reported and digitized.

The digitized data of all 18 species in text delimited (CSV), raster, and vector files are found in /Output.

To replicate the process of generating these files go through the R scripts sequentially:

  • 01_Digitizing_Data_CSV.R: Converts all .csv files from /RawData to one long csv file for larval distributions and one for towing effort
  • 02_Digitizing_Data_VectorAndRaster.R: Creates the vector (sf objects saved as .RDS) and raster (GEOTIFF files saved as .tif) files
  • 03_Making_Maps.R: Replicates the species plots shown in the data paper.

Save FAO data in Data/ folder to use this code. FAO data can be downloaded from: