ES60 Water Column Sonar Data Collected During FR0307

Sardine Survey. Forty-two primary stations were occupied during the survey. At
each station the following activities were performed:
a. Deployment of a Seabird SeaCat down to 100 meters, bottom depth
permitting. The self-contained CTD collected depth, temperature,
conductivity and chlorophyll data.
b. A standard Pairovet cast was deployed concurrently with the
CUFES system. The Pairovet net was fished from 70 meters to the
surface (depth permitting) using paired 25 cm diameter 150 µm mesh
nets. The technical requirements for the Pairovet tow was: Descent
rate of 70 meters per minute, a terminal depth time of 10 seconds
and an ascent rate of 70 meters per minute. All tows with wire
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angles exceeding 15° during the ascent were repeated.
c. Standard meteorological data including SST, wind speed and
direction, wave height and direction, cloud cover, relative
humidity, air temperature and barometric pressure.
d. During all transit between stations continuous measurements
were made of pelagic fish eggs (CUFES) and acoustic targets using
the ES-60. All acoustic targets and egg densities were recorded
for reoccupation during the night portion of the survey.