Northwest Fisheries Science Center

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Document Type: Contract Report
Center: NWFSC
Document ID: 9184
Title: Juvenile lingcod outer harbor field survey, Grays Harbor navigation improvement project
Author/Editor: Travis C. Coley, George T. McCabe, Robert L. Emmett, Robert J. McConnell
Publication Year: 1986
Publisher: National Marine Fisheries Service
Contracting Agency: U.S. Army Corps of Engineers. Portland, Oregon
Abstract:

In September 1985, the National Marine Fisheries Service entered into a cooperative agreement with the U.S. Army Corps of Engineers to conduct a bottom-trawl survey for juvenile lingcod and other demersal fishes in Grays Harbor and the offshore zone within a 2-mile radius of the entrance.  The 7-d study had the following primary objectives:

  1. Determine the distribution and relative density of juvenile lingcod in outer Grays Harbor and adjacent coastal areas during October 1985
  2. Determine if young-of-the-year (0+ age) lingcod were migrating from the estuary
  3. Determine the distributions and relative densities of other demersal fishes in outer Grays Harbor and adjacent ocean areas.

Fifteen juvenile lingcod were captured by trawling; all the juveniles, which were young-of-the-year, were captured in Grays Harbor.  No lingcod were captured in the ocean, nor were any captured with set lines.

There was variation among diversity values for the 30 trawling efforts.  Diversity tended to be lower at the mouth of the estuary than in the area upstream from the mouth.  The mean Shannon-Weaver diversity index (H) was 1.21 in areas at the mouth and 1.89 in areas upstream.  Much more research is needed before the lingcod community in Grays Harbor can be adequately described.  Intensive sampling throughout the year is needed to define the distribution, abundance, age-class structure, and movements of lingcod in the estuary and adjacent ocean areas.

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