Authors: M. Elizabeth Clarke and Erica Fruh

Abstract: Areas with high concentrations of glass sponges described as “reefs” recently were discovered associated with methane bubble plumes at Grays Canyon on the Washington State margin and a subsequent survey indicated that this is a particularly rich area with large numbers of associated fish and euphausids (Johnson 2008, 2009). Previously, large concentrations of glass sponges in the northwest Pacific were only known to occur only off British Columbia (e.g. Conway et al. 1991, 2001, 2004, 2005; Cook 2008). The goals of this AUV survey are to: 1) Examine the extent of the sponge reef; 2) Describe the associated ecosystem to assist in determining this area’s role as EFH; and 3) Provide the PFMC with additional information to assess any actions that may be needed to protect the Grays Canyon sponge area.

  • Technical Report
Type: DSCRTP Supported Date: 2011
  • Pacific Council
  • Grays Canyon