Maybe a silly question - should I add “identifiedBy” to absence data? 

The scientists specifically look for a species in the catch from the trawl and found none of them, so there are occurrence records with such species with occurrenceStatus == “absent”. 

If I have an event which only has absence data in occurrence extension, does it make sense to add “identifiedBy” for Humboldt Extension as well as those absence records in occurrence extension?