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

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

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

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

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

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

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

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

(m 2 ) log-transformed density (#/100m 2 ) Fish-Habitat Associations: Habitat Patch Size

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

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

Site Fidelity Yelloweye <1 % Hits by Receiver Days n=91 Detections n=20794

Site Fidelity Canary <1 % Hits by Receiver Days n=44 Detections n=610

Marine Reserve Site Evaluation DepthRockMixedSandTotal 0-25 m m > 55 m Total: DepthRockMixedSandTotal 0-25 m0.8%0.5%43.2%44.4% m0.1%18.3%37.2%55.6% > 55 m Total:0.9%18.8%80.3%100.0% Habitat areas in km 2 Percent habitat areas

Groundtruthing Groundtruthing backscatter images with ROV transects

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