Picture 1: Shark Lab at CSULB in 1970. Don
Nelson had just joined the faculty and had set
up several tanks outside the lab to hold sharks
for various projects.
Picture 2: Don Nelson diving down to tag a silky
shark at the “Tongue of the Ocean” off the
Bahamas in 1970. This was part of the famous
acoustic attraction experiments Don and
colleagues conducted to quantify the hearing
abilities of sharks.
Picture 3a: Dick Johnson setting up his
experimental room to determine whether horn
shark have circadian rhythms (1970).
Picture 3b: picture of a horn shark swimming
through the activity sensing bars.
Picture 4: Divers (Dick Johnson and Don Nelson)
preparing for a dive at Ship Rock off Catalina
to observe diel behaviors of horn sharks in the
field. The research vessel “Prionace” was built
by Don and his students for use in their shark
research off Long Beach (1971).
Picture 5: Picture of gray reef sharks circling
a hydrophone speaker at Enewetak during acoustic
playback experiments (1971).
Picture 6a: Dick Johnson towing the SOB - Shark
Observation Board at Enewetak (1970).
Picture 6b: Observers would lay on top of the
SOB to safely observe the gray reef sharks being
attracted to the hydrophone.
Picture 7: Tim Tricas, part of the Enewetak
team, holding open the jaws of a large tiger
Picture 8a: Jeff Landsman (1978) holding a
pop-up radio/acoustic transmitter for blue
Picture 8b: A blue shark with a pop-up
radio/acoustic transmitter at the surface. These
were the tags that Jeff used to track blue
sharks for his Master’s research.
Picture 9: Don Nelson with a scalloped
hammerhead shark off El Bajo Seamount, La Paz
Picture 10: Don Nelson showing off the SOS II –
Shark Observation Submersible at Enewetak. The
SOS II was designed and built by Don and his
students and was used for gray reef shark
agonistic display experiments in 1978.