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Water Column Mapping

Water Column Mapping. Michael Jech William Michaels NOAA Fisheries, NEFSC, Woods Hole, MA. Mandate – Conserve and Manage Marine Resources.

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Water Column Mapping

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  1. Water Column Mapping Michael Jech William Michaels NOAA Fisheries, NEFSC, Woods Hole, MA

  2. Mandate – Conserve and Manage Marine Resources • A Primary Management Objective:Develop sustainable harvest policies that minimize risks of overfishing target species (single species) and associated species (ecosystem). • An Advanced Technology Objective:Apply AT in efficient and intelligent ways. • HABITAT Two Broad & Overlapping Aquatic Categories: Pelagic (water column) Benthic (in or near the seabed)

  3. Fish Habitat

  4. Products and Output • Population Estimates • Culmination of survey design, measurements, biological data and areal or volume scaling. • Relative Index (trend) and/or absolute estimate (numeric density) • Resource Estimates • Local density or abundance • Spatial Distributions • Temporal Data • Biological Information (from net hauls) • Age, Length, Biomass, Diet, Maturity, Species ID • Clients: • Fisheries Managers • Commercial Fishers • Academia

  5. 100’s of meters 10’s of meters 100’s of meters Methodology – What does Multibeam do for us? 1D & 2D  3D • Increases sampling volume • Improve ability to extrapolate measurements • Improve mapping aggregations • Expands our view Improve detection of fish near bottom Improve detection of highly mobile fish

  6. Relative Index Requirements • Calibration to an absolute standard • System stability & performance • Comparison among surveys & among instruments • Water column and seabed backscatter • Optimally one instrument • Dynamic Range: 120+ dB • Scientific echo sounders: 120+ dB • Data Compression • Real time & post-processing • Data Processing • Real time & post-processing • Data Visualization • Real time & post-processing • Motion Compensation

  7. Relative Index Req. (cont.) • Position (vessel & towbody) • Data Formats • Open & available • Meta-data • FGDC, ICES • --------------------------------------------- • Species ID • Volume Scattering (relative index) • Volume integration • Beam patterns • Individual Target Strength • Single target detection

  8. Absolute Estimate Requirements • All ‘Relative’ requirements • [# m3] = Volume scattering “Target Strength” • Species ID • Biological Information

  9. Partners • Instrument Manufacturers • Data formats, instrumentation • 3rd party software • Data processing • Visualization • NOAA Computer Facilities • Data management • Data archive • Meta-data • NOAA Hydro & Fisheries • Joint surveys • Data sharing • Academia (National & International) • Data processing & analysis • Ecosystem studies

  10. Regional Fish Priorities • Northeast Groundfish • Cod, haddock, pollock • Spawning grounds on Jeffreys Ledge and Georges Bank • Southeast • reef fish, grouper • Northwest • Whiting, groundfish • Alaska • Walleye pollock, groundfish • Southwest • groundfish

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