- Habitat Home
- About Us
- Our Work
- About Habitat
- Funding Opportunities
- Our Partners
- News & Multimedia
- Publications & Resources
Mapping the Distribution and Intensity of Bottom Trawling Effort along the California Coast from 1997 to 2009, with Impacts on Deep-Sea Corals
To create a series of maps showing the intensity of fishing with nets towed on the bottom off California from 1997 to 2009, and on the same maps display locations where corals have been found.
Waters offshore of California from the Oregon border to the Mexico border beyond 3 nautical miles from shore out to waters 4,200 feet deep
Trawling locations and the hours fished, as recorded by the fishermen in logbooks submitted to the State, were used to create lines representing the individual tows of the net from start to end point. These tow-lines were overlaid with a grid of cells, and all the effort from three-year periods was summed to calculate the effort per square kilometer per year for each cell. To protect individuals’ confidential business practices, only cells fished by 3 or more vessels are displayed.
Maps and their GIS layers were produced and submitted to the Deep Sea Coral Research and Technology Program. The maps show how the intensity of trawling effort varies with depth and location relative to where deep sea corals have been observed.
Importance to Management
These maps were presented to the Habitat committee of the Pacific Fishery Management Council to help them identify areas minimally impacted by trawling. Minimally trawled areas are more likely to have undamaged deep sea corals and sponges that could be protected and may be an important habitat for some fish.
Fiscal Year 2009 Funding
Point of Contact
Janet Mason, Janet.Mason@noaa.gov