NOAA Protocols for Fisheries Acoustics Surveys and Related ...

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Scientific Computer System (SCS) Figure 5. Pictorial overview of the hierarchical NEFSC acoustical event log. Techniques Event Log The Scientific Computer System (SCS) is a shipboard system that logs data from electronic sensors throughout the vessel. Within the SCS framework, SCS event logs are created for specific surveys. The acoustical event log electronically documents events in order to coordinate the acoustical data with other scientific operations, such as CTD and trawl deployments. At the conclusion of a survey, the event log data are audited and entered in an Oracle database. In addition to the electronic log, a ‘hardcopy’ paper form is filled out with equivalent information. This paper log is updated each time the SCS event log is updated. Prior to sailing, an acoustical SCS event log is created by modifying an existing acoustical event log template. The survey code is set to the current survey, and the event log is saved to a new file. The file name of the SCS acoustical event log is used to define the directory where the data are stored. During the survey, the acoustical SCS event log is constantly monitored and updated for all events by the scientific personnel. The watch chief is responsible for event log quality and for training personnel in the use of the event log. 74
SCS data The following sensor data are pertinent to the acoustical survey and should be collected: a. Date and time (GMT) b. GPS (differential and PCODE) c. Doppler Speed Log (bridge speed log) d. Motion Sensor Prior to sailing, the ship’s electronic technician is contacted to ensure these data are stored. At the end of the survey, copies of the SCS data are requested from the ship’s electronic technician. Data Management At the conclusion of each ‘leg’ of the survey, the SCS and SCS event log data are downloaded to a shore-based computer for storage and archiving. The SCS data are archived by the ship’s electronic technician, the NEFSC, and the fisheries acoustics group. Archival and management of CTD data are the responsibility of the Fisheries Oceanography Investigation. Modifications to Protocols Changes to operational protocols will be at the discretion of the NEFSC Science Director who may approve such changes directly or specify a peer review process to further evaluate the justification and impacts of the proposed changes. References Demer, D.A., M.A. Soule, and R.P. Hewitt. 1999. A multiple-frequency method for potentially improving the accuracy and precision of in situ target strength measurements. J. Acoust. Soc. Am. 105: 2359-2377. Dotson, R. C. and Griffith, D. A. 1996. A high-speed rope trawl for collecting coastal pelagic fishes, CalCOFI Rep., 37: 134-139. Simrad, 1996. Simrad EK500 Scientific Echo Sounder Operator Manual. Simrad Norge AS, Documentation Department, Strandpromenaden 50, Horten, Norway 75
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NOAA Protocols for Fisheries Acoust
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Echo Sounder Parameters ...........
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Trawls ............................
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Introduction In response to Vice Ad
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Advanced Survey Technologies Progra
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Techniques Before conducting a cali
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Considerations Remediation Echo sou
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transmission loss. To correct for s
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unavoidably discarded, just as some
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factors such as orientation are not
Page 24 and 25: A schedule for calibration and main
Page 26 and 27: Techniques Noise Acoustical A commo
Page 28 and 29: ⎛ I ⎞ r TS ≡ 10 log10 ⎜ ⎟
Page 30 and 31: Considerations Remediation If a TS-
Page 32 and 33: Techniques Beam Pattern Transducers
Page 34 and 35: during vertical migration, will cau
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Page 40 and 41: permanently archived for each surve
Page 42 and 43: Numerical Density to Biomass Densit
Page 44 and 45: An electronic ‘event log’ can b
Page 46 and 47: References Demer, D.A., M.A. Soule,
Page 48 and 49: Regional Protocols Because of the d
Page 51 and 52: Table of Contents Introduction.....
Page 53: Electrical ........................
Page 56 and 57: Center Background NEFSC The Northea
Page 58 and 59: S v Calibrations The NEFSC acoustic
Page 60 and 61: Operation Menu/Transmit Power Norma
Page 62 and 63: Software The echo sounder firmware
Page 64 and 65: ii. Minimum Sv for good pick: -50.0
Page 66 and 67: Net mensuration sensors are attache
Page 68 and 69: We remove backscattering by surface
Page 70 and 71: GPS The primary Global Positioning
Page 72 and 73: Electrical Electrical noise protoco
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Page 80 and 81: Techniques ........................
Page 82 and 83: Center Background AFSC The Alaska F
Page 84 and 85: On-axis sensitivity and S v calibra
Page 86 and 87: Volume Backscattering Measurements
Page 88 and 89: Mid-water juvenile pollock (max sa=
Page 90 and 91: Biological Sampling Mid-water and n
Page 92 and 93: Bubble Attenuation Vessel speed is
Page 94 and 95: Data Collection Since 1990 to the p
Page 96 and 97: sampling resolution of scattering l
Page 98 and 99: A decision must be made as to wheth
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Page 106 and 107: Acoustic Data......................
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Page 114 and 115: Classification Techniques Single Fr
Page 116 and 117: Performance Degradation Definition
Page 118 and 119: Biological Data Data from catch pro
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Improvements - The annual hake migr
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Techniques The primary source of th
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Hamano, A., Sasakura, T., Kieser, R
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