You don’t have to take a REEF dive trip to participate
in its fish counts. The nonprofit encourages divers to do
it whenever and wherever they go diving in waters from
Canada down to the Galapagos, with the same materials
and methods used on their trips.
For beginning divers, REEF has just adapted its classroom
  course into a home-study DVD package. “Reef Fish
  Identification – A Beginning Course,” which teaches the
  fishwatching basics, includes identification of 50 commonly
  sighted species found in the Caribbean, Bahamas and
  Florida. The DVD costs $55 and includes a waterproof fish
  ID booklet, underwater survey slate and REEF survey materials.
  Order either online at www.reef.org, or call REEF at
  305-852-0030.  
Volunteers use the same Roving Diver Technique our
  writer describes in the Kona story. The only materials
  needed are a slate and pencil, one of REEF’s free scantron
  forms available at its online web store, and a good fish ID
  book. The goal is to find as many species as possible, so divers
  are encouraged to look under ledges and up in the water
  column. Divers in California and Pacific Northwest waters
  can also take part in monitoring programs for algae and
  invertebrates such as anemones, starfish, and sponges.  
Forms can be mailed to REEF or submitted on their
  online data entry site. All the data is housed in a publicly
  accessible database on REEF’s Web site and is used by multiple
  marine agencies and researchers. Besides helping U.S.
  and Caribbean environmental protection agencies get good
  data to rely on, you’ll have better dive experiences while you
  realize who are the usual suspects and which species is a
  fantastic find.