WCR_HMS_EFH_20241021_Common_thresher_shark

Common thresher shark EFH is defined using a combination of data sources described in the FMP as well as expert opinion. While common thresher sharks may occur in shallow water <12 m, they occur primarily in deeper waters, seaward of 12 m, and these shallow regions including enclosed bays and estuaries are not considered essential. Including all age classes, common thresher shark EFH includes the U.S. West Coast EEZ from the U.S.-Mexico border to the U.S.-Canada border, to approximately 100 nautical miles offshore, seaward of the 12 m depth contour. While small schooling fish appear to be their preferred prey, diets vary temporally and spatially and include squid and crustaceans. The high productivity and presence of diverse small schooling fish, squid and crustacean species and relatively warm shallow shelf waters make the California Current, out to approximately 100 nautical miles, a suitable habitat for feeding and growth to maturity for common thresher sharks.The Magnuson-Stevens Fishery Conservation and Management Act (MSA) requires that regional management councils describe EFH in their fishery management plans (FMPs), that they minimize to the extent practicable adverse effects on EFH from fishing activities, and that federal agencies consult with the National Marine Fisheries Service on activities that may adversely affect EFH, among other things. Actions that occur outside of EFH, but that may adversely affect EFH, also warrant an EFH consultation. EFH means those waters and substrate necessary to fish for spawning, breeding, feeding, or growth to maturity (50 CFR 600.10). FMPs must describe and identify EFH in text that clearly states the habitats or habitat types determined to be EFH for each life stage of the managed species, if possible. The text descriptions are ultimately determinative of the limits of EFH. Those text descriptions of HMS EFH can be found in the HMS FMP available on the Pacific Fishery Management Council (Council) website: https://www.pcouncil.org/. In addition, FMPs must include maps that display, within the constraints of available information, the geographic locations of EFH or the geographic boundaries within which EFH for each species and life stage is found (50 CFR 600.815(a)(1)(v)(A)). This Geographic Information System (GIS) data which depicts the EFH of HMS within the EEZ off the U.S. West Coast, was developed to meet that requirement.

This dataset depicts the boundary of essential fish habitat (EFH) for Common thresher shark which is a Highly Migratory Species (HMS) within the exclusive economic zone (EEZ) off the U.S. West Coast.

When evaluating the effective use of EFH data in GIS, consider the following spatial data caveats:To maintain a conservatively inclusive boundary while using consistent coastwide data for the eastern boundary of EFH, some data may overlap land. This overlap can result in overly inclusive data, which may not be suitable for analyses requiring more precise inland mapping. While such errors might be negligible in large-scale maps, they become problematic when accurate information is needed for specific locations.Directly outside the mouth of San Francisco Bay, the nearshore extent was adjusted for clarity and consistency with the text description, indicating that EFH extends seaward beyond the -12 m depth contour but excludes the bay.This spatial data is intended to assist the public and our partners with visually interpreting HMS EFH designations. Please refer to the HMS FMP for official text descriptions of EFH.These data are a generalized interpretation of the textual description of EFH and do not fully represent the complexity of the habitats described in the FMP. The textual description of the EFH is always ultimately determinative of the limits of EFH.

Esri ArcGIS 13.1.3.41833

HMS GIS data was developed using one or more of the following: 1) existing species distributions in the eastern North Pacific from published sources including the initial EFH descriptions, 2) expert opinion and 3) a review of fisheries data

GIS data used to guide and establish boundaries for EFH data creation include:

1) Western extent:

100 nm westward of the -12 meter contour depth line

(measurement conducted in GIS utilizing buffering geoprocessing tool)

2) Eastern extent:

A -12 meter contour depth was developed from NOAA's National Centers for Environmental Information (NCEI) Coastal Relief Models;

Vol. 6: Southern California (2003) Vol. 7: Central Pacific (2003) and Vol.8: Northwest Pacific (2003)

Data Source: Coastal Relief Model (CRM) - Download Date 8/2024

https://www.ncei.noaa.gov/products/coastal-relief-model

3) At the mouth of San Francisco Bay (for applicable HMS species in this area: Albacore Tuna, Blue Shark, Common thresher shark, Pacific bluefin tuna, Shortfin mako shark, Swordfish),

the COLREGS Demarcation Line was used as the eastern extent.

Data Source: Marine Cadastre

https://hub.marinecadastre.gov/datasets/eeec3469795243f7bf91861e00fb6f40_0/about