WCR_HMS_EFH_20241021_Bigeye_tuna

Bigeye tuna EFH is defined using a combination of data sources described in the FMP as well as expert opinion. The occurrence of bigeye tuna in the U.S. West Coast EEZ is not common, and typically occurs in warm water years. Bigeye tuna EFH includes oceanic, epipelagic, and mesopelagic waters of the U.S. West Coast EEZ from the U.S.-Mexico border to just north of Point Conception, California (34° 34' N), seaward of the 12 m depth contour. Habitat is concentrated in the SCB primarily south of 34° N latitude. While bigeye tuna may occur in shallow water <12 m, they occur primarily in deeper waters and these shallow regions including bays and estuaries are not considered essential. The high productivity and presence of diverse fish, squid, and crustacean species make the California Current a suitable feeding habitat for juvenile and adult bigeye tuna.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 Bigeye tuna 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.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:

Exclusive Economic Zone (EEZ)

Data Source: https://nauticalcharts.noaa.gov/data/us-maritime-limits-and-boundaries.html

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