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Hydrographic Services Review Panel October 2010

Explore the use of seafloor mapping data for monitoring fish populations, assessing habitats, and evaluating marine reserves. Discover how high-resolution mapping is essential for understanding fish density and habitat associations.

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Hydrographic Services Review Panel October 2010

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  1. Use of seafloor mapping data in management of nearshore biological resources Hydrographic Services Review PanelOctober 2010 David Fox Oregon Department of Fish & Wildlife Marine Resources Program

  2. Outline of Presentation • Program overview • Fish population monitoring and assessment • Fishery research • Marine reserve evaluation • Groundtruthing • On-going data needs

  3. Program Overview • Oregon Department of Fish and Wildlife • Marine Resources Program • Natural resource management (primarily fisheries management) • Research and monitoring • Public information and education • Direct jurisdiction in state’s territorial sea and estuaries • Partnership role in resource management in federal waters

  4. Nearshore Habitat-Based Fish Monitoring and Assessment • Habitat area x fish density = fish abundance • Three basic type of information (all depend on high resolution seafloor mapping data) 1) Inventory of habitats 2) Measure of fish density 3) Fish habitat associations

  5. Seafloor Habitat Inventory Bathymetry Derived products – bathymetric position index Seafloor habitat interpretation

  6. ROV Surveys to Measure Fish Density 30 x 100 m 4 x 8 km ~1.5 x 2 m

  7. Fish-Habitat Associations Low Relief High Relief Using derived descriptors of reef physical morphology % Cover = 29.1% Density = 34.5/ha % Cover = 12.3% Density = 21.3/ha % Cover = 23.1% Density = 28.4/ha

  8. 5m x 8m 10m x 40m Fish – Patch Area Relationships 30m x 100m 20m x 250m

  9. Fish-Habitat Associations: Habitat Patch Size log-transformed density (#/100m2) (m2) log-transformed density (#/100m2) (m2)

  10. Fish-Habitat Relationships s (Distance to Reef Crest ) Distance to Reef Crest (m) Canary Rockfish observations from ROV survey of Siletz Reef Complex (Lincoln City, OR) Generalized Additive Model:# Canary Rockfish ~ (Depth + Slope + Aspect + Rugosity + Bathymetric Position Index) Prediction of fish “probability of occurrence” at unsampled locations s (Depth) Depth (m) Habitat-based stock assessments

  11. 16 km Rockfish Acoustic Tagging Project Siletz Reef, Oregon Acoustic Receiver Grid (circles represent 500 m radius around each receiver) TOTAL= 35 receivers

  12. % Hits by Receiver 97-100 76-96 51-75 10-50 1-9 <1 Site Fidelity • Yelloweye 207 Days n=91 Detections n=20794

  13. % Hits by Receiver 97-100 76-96 51-75 10-50 1-9 <1 Site Fidelity • Canary 20 Days n=44 Detections n=610

  14. Marine Reserve Site Evaluation Habitat areas in km2 Percent habitat areas

  15. Groundtruthing Groundtruthing backscatter images with ROV transects

  16. On-Going Seafloor Mapping Needs • Management Needs • Marine spatial planning • Fish Stock assessment • Nearshore monitoring • Marine reserve monitoring • Ocean development siting and impact assessment • Seafloor Mapping Needs • Continue filling the gaps in state territorial sea mapping • Map the very-nearshore (0-10 m water depth) • Estuary bathymetry and habitat mapping • Full coverage multibeam bathymetry and backscatter, interpretive products, groundtruthed, web-based product delivery

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