Project: Spawning Habitat and Early-life Linkages to Fisheries (SHELF)
Name: Kevin Boswell
Email: kevin.boswell@fiu.edu
Institution: University of South Florida / College of Marine Science
InfoURL: https://data.gulfresearchinitiative.org/data/F2.x836.000:0005
Source URL: (local files)
20210927
Trajectory - F2.x836.000.0005 - Backscatter_SHELF_FMG_sonar_data - 28.53N, 84.26W - 2017-07-13
Unknown
tabular digital data
Anywhere, MD, USA
ERDDAP, version 2.31.1, at Set-me Institution
https://erddap.griidc.org/erddap/tabledap/F2_x836_000_0005_Backscatter_SHELF_FMG_sonar_data.html
https://erddap.griidc.org/erddap/tabledap/F2_x836_000_0005_Backscatter_SHELF_FMG_sonar_data.graph
https://erddap.griidc.org/erddap/tabledap/F2_x836_000_0005_Backscatter_SHELF_FMG_sonar_data.subset
Spawning Habitat and Early-life Linkages to Fisheries (SHELF)
After collecting egg survey samples, active-acoustic transects were collected to examine the spatial distribution of reef fish in the Florida Middle Grounds (FMG). Active acoustic data were collected with calibrated multi-frequency split-beam echosounders (Simrad EK80) operating at nominal frequencies of 38, 70 and 120 kHz. Pulse repetition rates were set to maximum, with a pulse duration of 128 ms. The 38 kHz transducer was deployed on the hull of the vessel, and the 70 and 120 kHz transducers were deployed on a pole along the side of the ship. During the survey, water temperature and conductivity were collected throughout the water column at standardized locations using a Sea-Bird 19+ Conductivity, Temperature, Depth (CTD) (Sea-Bird Electronics, Inc.) to characterize water chemistry, vertical water column structure, and derive sound-speed profiles. Sound speed and absorption coefficients were calculated to account for the effects of temperature and salinity on acoustic transmissions. Acoustic data were visualized and manually edited in Echoview 8. The echo-integral was computed for the acoustic backscatter in cells 10 m long by 10 m deep, comprising each elementary sampling distance unit (EDSU). To account for positional differences in the location of the transducers, offsets were measured and incorporated to correct the spatial location of each sample for the three transducers. A bottom-detection algorithm with a 0.5 m backstep was applied to the data and was manually edited to ensure the sea floor and reef structure were excluded from the analysis. Standard output following echo integration includes the acoustic estimate of fish density, SA (NASC, nautical area scattering coefficient, in m2 nmi?2). The echo integral was quantified for each elementary distance sampling unit to examine reef-fish density associated with each station with an echo integration threshold of -60 dB. Following echo integration, estimates of target strength (TS, in dB), which is proportional to fish length, were computed for each station to describe the length distributions of detected fish. Single targets were detected with a TS threshold of -47 dB; targets exceeding the algorithm criteria were accepted into the analysis. The single target algorithm was tuned to accept targets with echo en_velopes between 0.6 and 1.7 times the pulse length, with a maximum beam compensation of 6 dB. Given the mixed species assemblage often associated with natural and large artificial reefs in the Gulf of the relationship defined in McCartney and Stubbs (1971) was used for TS as a function of SL (in cm) following:TS = 24.5 * log10 (SL) ? 66.84. Fish density estimates were calculated as mean NASC divided by mean ?bs of a known volume of water given (EDSU) the relationship, fish density (fish m-2) = NASC/(4n*obs).
Unknown
https://data.gulfresearchinitiative.org/data/F2.x836.000:0005
20170713
20170714
ground condition
As needed
-84.27849
-84.24413
28.63694
28.428879
GCMD Science Keywords Version 9.1.5, CF Standard Names v77
19+
2017-07-13
2017-07-14
acoustics
area
backscatter
beam transmission
bird
coefficient
collected
conductivity
coordinate
crs
ctd
data
depth
depthDistanceInterval
depthInterval
deviation
distance
distanceInterval
echosounder
end
fish density
florida
fmg
frequency
grid
grounds
habitat
habitat_type
habitatType
horizontal
identifier
instrument
instrument1
international
interval
latitude
longitude
m2*nmi
m2*nmi-2
mapping
marine
middle
name
nasc
nautical
number
ping
pingEnd
pingStart
platform
program
range
reference
scatter
scatter_ceofficient
sciences
sea
sea-bird
shelf
site
site_name
siteName
sonar
sonde
spatial
standard
standard_deviation
start
statistics
system
target
temperature
time
trajectory
type
underway
university
variable
vertical
vertical_range
weather observations
CF Standard Name Table v72
time
latitude
longitude
site_name
habitat_type
depth
depth
depth
None.
These data may be redistributed and used without restriction.
University of South Florida / College of Marine Science
Kevin Boswell
Unknown
Mailing and Physical Address
Unknown
Unknown
Unknown
Unknown
Unknown
Unknown
kevin.boswell@fiu.edu
https://erddap.griidc.org/erddap/tabledap/F2_x836_000_0005_Backscatter_SHELF_FMG_sonar_data.graph
Web page to make a customized map or graph of the data
HTML
Contributor Name: Ernst B. Peebles
Contributor Email: epeebles@marine.usf.edu
Contributor Role: Associate Professor
Acknowledgement: unkonwn
Unknown
Unknown
Unknown
Unknown
2021-09-27T21:13:47Z
Unknown
Point
String
Set-me Institution
Firstname Surname
ERDDAP Administrator
Mailing and Physical Address
123 Simons Ave.
Anywhere
MD
12345
USA
555-555-5555
set-me@domain.com
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None
20260910
Set-me Institution
Firstname Surname
ERDDAP Administrator
Mailing and Physical Address
123 Simons Ave.
Anywhere
MD
12345
USA
555-555-5555
set-me@domain.com
Content Standard for Digital Geospatial Metadata
FGDC-STD-012-2002
universal time
None.
These data may be redistributed and used without restriction.