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Groundfish Trawl Density, 1997-2017

Groundfish Trawl Density, 1997-2017

Aug 27, 2020 (Last modified Aug 8, 2022)

Uploaded by Conservation Biology Institute

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Description:: This feature collection summarizes logbook records from the CDFW Marine Log System (MLS) showing the density of trawls targeting groundfish from 1997 to 2017. Data from CDFW Marine Log System (MLS) were extracted to determine the start position, end position, vessel ID, tow or drag number ID, date, target species, and species landed. Records were transformed and plotted to create straight line trawl tracks attributed with date and targets. Lines were filtered to remove records plotted on land and track lines greater than 25km in length. Records were selected for groundfish targets (species list provided by T. Larinto - see supplemental info) and summarize by the ArcGIS line density function. Results are presented by a 1km cell GRID representing a 5km search radius. Units are reported as total length of trawls (Km) within the search area.

Target species list used to identify groundfish trawling targets:
TargetStrategy Description-
ARRA Aurora rockfish
ARTH Arrowtooth flounder
BANK Bank rockfish
BCAC Bocaccio
BLGL Blackgill rockfish
BRSH Bottom rockfish-shelf
BRSL Bottom rockfish-slope
BRWN Brown rockfish
CLPR Chilipepper rockfish
CNRY Canary rockfish
DBRK Darkblotched rockfish
DOVR Dover sole
DSRK Spiny dogfish
DTS Dover-Thornyheads-Sablefish
DWD Deepwater Dover (focus on Dover sole)
EGLS English sole
GRDR Grenadiers
GSPT Greenspotted rockfish
LCOD Lingcod
LSPN Longspine thornyheads
NSM Nearshore flatfish mix
OFLT Other flatfish
PDAB Pacific sanddab
PTRL Petrale sole
PWHT Pacific whiting
RCK6 Group rockfish (rosefish or large red)
REX Rex sole
ROCK Rockfish (all)
RSOL Rock sole
SABL Sablefish
SBLY Shortbelly rockfish
SCOR CA scorpionfish
SDAB Sanddabs (all)
SHRP Sharpchin rockfish
SNOS Splitnose rockfish
SSOL Sand sole
SSPN Shortspine thornyhead
STRY Starry flounder
THDS Thornyheads, unspec.
THHD Thornyheads (mixed)
UFLT Flatfish, unspec.
URCK Rockfish, unspec.
USKT Skate, unspec.
USLF Shelf rockfish
USLP Slope rockfish
WDOW Widow rockfish
YTRK Yellowtail rockfish

Data Provided By:: California Department of Fish and Wildlife, Marine Region GIS lab with post-processing by the Conservation Biology Institute

Content date:: not specified

Spatial Resolution:: 0.010449 (Degree)

Contact Organization:: Department of Fish and Wildlife, Marine Region

Contact Person(s):

Marine Region GIS

Use Constraints:: License: This work is licensed under Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). Using the citation standards recommended for BIOS datasets (https://www.wildlife.ca.gov/Data/BIOS/Citing-BIOS) satisfies the attribution requirements of this license. Disclaimer: The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.

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Dataset Type:: Layer Package

Tags:: trawl, logs, marine log system, groundfish, fisheries, marine, economy, california department of fish and wildlife, mls, ocean, logbook, cdfw

Downloaded by 2 Members

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About the Uploader

Conservation Biology Institute

We provide advanced conservation science, technology, and planning to empower our partners in solving the world’s critical ecological challenges