Non-commercial Boat-based Spear Fishing Estimated Average Annual Catch of Reef Fish, 2004-2013 - Hawaii

Description

Nearshore fisheries in the Main Hawaiian Islands encompass a diverse group of fishers using a wide array of gears and targeting many different species. Communities in Hawaii often rely on these fisheries for economic, social, and cultural services. However, the stress from overfishing can cause ecosystem degradation and long-term economic loss. This layer represents the average annual catch of reef fish by non-commercial boat-based spear fishing methods. Average annual catch at the island scale from 2004-2013 was estimated from Marine Recreational Information Program (MRIP) combined fisher intercept and phone survey data (McCoy et al., 2018). These island-scale estimates were spatially distributed offshore using distance to boat harbors and launch ramps while accounting for marine protected areas (MPAs) and de facto MPAs (e.g., military danger zones) where access is restricted. A Gaussian decay function assumed the majority of the catch occurs within 10-20 km of each harbor. Additionally, the Ocean Tipping Points (OTP) project weighted boat harbors by the human population present within 30 km. This layer's spatial footprint aligns with the inshore commercial reporting blocks for commercial fish catch reporting to the State of Hawaii Department of Aquatic Resources (DAR). Point data for boat harbors and launch ramps were combined from two datasets available from the Hawaii Statewide GIS Program website (Harbors.shp and BoatingFacilities.shp) (http://planning.hawaii.gov/gis/download-gis-data/). Data were checked for quality to ensure only operational boat harbors and launch ramps were included and geographic positions were accurate. Anchorages, fishing piers, historic, and disused ramps/harbors were removed prior to analysis. Boat facility weighting factors were calculated based on total human population within 30 km of each boat harbor or ramp. Human population was mapped based on 2010 census data and LANDFIRE land use/land cover data using the USGS Dasymetric Mapping Tool to gain a more accurate representation of population distribution. A 30-km buffer was then created around each boating facility and a Zonal Statistics tool was used to sum the human population within each buffer. These population values were then used to assign weights to each boating facility in order to allocate a proportion of total island catch estimates to each boat harbor or ramp. These weights sum to 1 for each island. In order to allocate catch proportionally to each boat harbor/ramp, estimated annual catch at the island scale and the human population-based weighting factor were joined to the attribute table of each boating facility's cost allocation footprint and used in a Gaussian decay function with each distance surface. This decay function assumes the majority of catch occurs within 10-20 km of a harbor or ramp and declines more rapidly with increasing distance. Catch in full no-take MPAs were set to zero and other areas with restricted access were reduced according to expert input and local knowledge. Pixel values within each boating facility's footprint were then rescaled such that the sum in each footprint was equal to the respective boat facility's weighting factor times the MRIP catch estimate for that island in units of kg per pixel. Finally, all raster layers for each boat harbor/ramp were summed together. Final pixels values are in units of kg/ha such that the sum of all pixels for each island is equal to the estimates of average annual catch from McCoy et al. (2018). Units, pixel size, and grid alignment are consistent with all other OTP fishing layers so that they can be compared directly or added together for various uses.

Resources

Name Format Description Link
0 This URL provides access to this dataset via GeoServer, including multiple output formats and an OpenLayers viewer. http://geo.pacioos.hawaii.edu/geoserver/
50 Open Geospatial Consortium Web Coverage Service (WCS). Supported WCS versions include 1.0.0, 1.1.0, and 1.1.1. Supported output formats include GeoTIFF, GIF, JPEG, PNG, or TIFF. http://geo.pacioos.hawaii.edu/geoserver/PACIOOS/hi_otp_all_fishing_rec_boat_spear/ows?service=WCS&version=1.0.0&request=GetCapabilities
0 This URL provides a viewer for this dataset. http://geo.pacioos.hawaii.edu/geoexplorer/
0 This URL provides a viewer and/or data access for this dataset. http://pacioos.org/projects/oceantippingpoints/#data
0 http://oceantippingpoints.org/about-us/people#Carrie
0 http://oceantippingpoints.org/about-us/people#Kim
27 http://oceantippingpoints.org
0 http://oceantippingpoints.org/about-us/people#Carrie
0 http://oceantippingpoints.org/about-us/people#Carrie
27 http://pacioos.org
0 http://oceantippingpoints.org/about-us/people#Carrie
27 http://pacioos.org
27 http://oceantippingpoints.org
27 http://pacioos.org
27 http://pacioos.org
52 Open Geospatial Consortium Web Map Service (WMS). Supported WMS versions include 1.1.1 and 1.3.0. Supported map formats include AtomPub, GeoRSS, GeoTIFF, GIF, JPEG, KML/KMZ, PDF, PNG, SVG, and TIFF. Supported info formats include GeoJSON, GeoJSON-P, GML, HTML, and plain text. http://geo.pacioos.hawaii.edu/geoserver/PACIOOS/hi_otp_all_fishing_rec_boat_spear/ows?service=WMS&version=1.3.0&request=GetCapabilities
52 Open Geospatial Consortium Web Map Service - Cached (WMS-C). Use of WMS-C is similar to traditional WMS but with the addition of the "tiled=true" parameter, which triggers GeoServer to pull map tiles from GeoWebCache if they have been previously generated. This can dramatically improve performance, especially for larger datasets. Supported map formats include JPEG and PNG. Supported info formats include GeoJSON, GML, HTML, and plain text. http://geo.pacioos.hawaii.edu/geoserver/PACIOOS/gwc/service/wms?service=WMS&version=1.1.1&request=GetCapabilities&tiled=true

Tags

  • human dimensions
  • united states of america
  • coral reef
  • ecosystems
  • human settlements
  • biosphere
  • agriculture
  • oceans
  • pacioos
  • continent
  • coastal areas
  • hawaii
  • pacific islands ocean observing system
  • marine ecosystems
  • north america
  • aquatic sciences
  • earth science
  • environmental impacts
  • aquatic ecosystems
  • ocean
  • hawaiian islands
  • environmental sustainability
  • agricultural aquatic sciences
  • social behavior
  • fisheries
  • fishing
  • central pacific ocean
  • reef habitat
  • recreational activities/areas
  • coastal processes
  • reef
  • coral reefs
  • pacific ocean
  • sustainability

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