Are you familiar with REEF?  Many scuba divers amd snorkelers are and many are not.  So what is REEF and what is the REEF Fish Survey Project?
REEF’s mission, to educate and enlist divers in the conservation of marine habitats, is accomplished primarily through its Fish Survey Project. The Project was developed in 1990 with support from The Nature Conservancy (TNC) and guidance by the Southeast Fisheries Science Center of the National Marine Fisheries Service (NMFS). The REEF Fish Survey Project allows volunteer SCUBA divers and snorkelers to collect and report information on marine fish populations. The data are collected using a fun and easy standardized method, and are housed in a publicly-accessible database on REEF’s Website. These data are used by a variety of resource agencies and researchers.