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We urge caution when utilizing these data due to the complexity of groundfish management and fleet harvest dynamics.The polygon layer is a vector layer with values representing the proportion of all lines coastwide intersecting each 10 x 10 min cell. The benefit of this output over depicting lines themselves is that all data can be represented, while still ensuring confidentiality of individual fishing locations.This spatial summary of fishing effort was developed from lines connecting gear set and retrieval points. Although fishing does not occur continuously along a fixed gear set (e.g., longline, pots), some amount of fishing does occur between set and retrieval points. For that reason, we treated fixed gear sets similarly to trawl tows. This summary is not intended to quantify total impact of fishing on either benthic or pelagic habitats. Purpose: The main purpose of this data layer is to help inform the National Marine Fisheries Service Biological Opinion on Continuing Operation of the Pacific Coast Groundfish Fishery (NMFS 2012). In 2011, new regulations governing the limited entry bottom trawl and midwater trawl fisheries led to the induction of individual fishing quotas (IFQs). Primary goals of IFQ management included decreased bycatch and increased catch accountability, profitability, and efficiency. In the shoreside bottom trawl fishery, permit holders with IFQ and a trawl endorsement can use multiple gear types (although not within the same trip), including bottom trawl, midwater trawl, hook-and-line gear, and pot gear. These management changes could impact fishing effort in trawl sectors, as well as alter fixed gear fishing effort by providing a new opportunity for fixed gear fishing activity and potential competition between IFQ and other fixed gear sectors. This data layer displays fishing effort to assess these potential changes. NMFS (National Marine Fisheries Service). 2012. Continuing Operation of the Pacific Coast Groundfish Fishery - Endangered Species Act (ESA) Section 7(a)(2) Biological Opinion and Section 7(a)(2) \"Not Likely to Adversely Affect\" Determination. PCTS Number: NWR-2012-876. 194 p. 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