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The layer was developed using the kernel density function in ArcPro. Kernel density estimates were created using the point density spatial analyst tool. Commercial albacore logbook data were used to create points that met the following criteria:Points that intersected land were removedPoints that did not meet the rule of three unique vessels per 20km grid cell were removedThese filters removed 1% of the points for all yearscombined.These point locations were used as the population field with an output cell size of 20km and a search radius of 0.5 cells. Fishery logbook data are recorded on standardized data sheets by fishermen during their fishing operations. The logbooks are later turned over to SWFSC for data entry and processing. 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