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Matching Vessel Monitoring System data to trawl logbook and fish ticket data for the Pacific groundfish fishery
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2020
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Series: NOAA-TM-NMFS-SWFSC ; 623
[PDF-1.08 MB]
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Description:High-resolution spatial data on fishing effort and catch is an increasingly important source of information for fisheries scientists and fisheries managers. In this report we detail how high-resolution spatial-temporal data from Vessel Monitoring Systems (VMS) can be matched with existing data on West Coast commercial fishing effort and catch in order to create rich data products. The primary purpose of the report is to provide descriptive summaries of West Coast VMS data and to relate these data to existing sources of West Coast commercial fishing data. A secondary objective of the report is to illustrate how
VMS and complimentary commercial fishing data from groundfish trawl logbooks and fish tickets may be used to evaluate a range of research questions, including: (i) how well do fishing locations reported on West Coast groundfish trawl logbooks agree with spatial records from VMS?, (ii) Do differences in spatial agreement between logbooks and VMS records vary systematically over time or across regions?, (iii) How are differences in spatial agreement between logbook and VMS fishing locations affected by modeling choices?, and (iv) How well can vessel speed discriminate between fishing and non-fishing VMS polls for West Coast groundfish vessels. We found that the median distance between logbook fishing locations and VMS fishing locations ranged from 0.7 to 2 km depending on the method used to define logbook fishing locations. Differences in the method for constructing tow paths affected the degree to which logbook and VMS data agreed, with straight-line tow paths generating greater spatial agreement with VMS polls than bathymetry-influenced tow paths. The analysis found differences in agreement between regions with potentially different fishing strategies or bathymetric complexity. We found little difference in spatial agreement across years.
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