Daily At-Sea Logs
May 11, 2004
now 2000 hours and I have been on the Nancy Foster for 29 hours.
had an incredibly busy day. We decided Monday evening to begin our
Passive Acoustic Monitoring Systems (PAMS) instruments were deployed
this morning. PAMS has a hydrophone (a microphone that is used
are several factors that affect how well this instrument detects sounds
emanating from far away. Sound moves five times faster in water than
air because water has a higher density than air does. Additionally,
the range of frequencies that are produced by the animals also affects
how well PAMS will detect the sounds. Most fish all
So how can we use the data that is collected by PAMS in order to gain a better understanding about fisheries and Gray's Reef? One such application of the sounds captured with PAMS is the possibility to determine whether spawning is occurring or not. There is a direct relationship between the loudness of sounds emitted and the spawning cycles of fish in our general area. Many female fish along the southeast coastal areas do not produce sounds, with the exception of the female black drum. It is up to the male fish to attract females with their strong, deep sounds. In fact, the male spotted sea trout has as many as three different sounds that he uses to attract a mate!
is interested in collecting human-related sounds, as well as fish
more information on PAMS, CLICK
HERE to visit the Oculina Coral Banks 2003 expedition daily log.
Dept. of Geology & Environmental Geosciences
College of Charleston
Charleston, SC 29424