Several websites allow users to upload invasive lionfish sighting information. However, the USGS and REEF have maintained the two largest and most detailed sighting databases. For the purpose of data consolidation, it is suggested to report sightings to these sources.

U.S. Geological Survey (USGS) sighting report form
Reef Envirnmental Education Foundation (REEF) reporting form
http://www.myfwc.com/reportlionfish