|Document Type:||Contract Report|
|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|
|Publisher:||National Marine Fisheries Service|
|Contracting Agency:||U.S. Army Corps of Engineers. Portland, Oregon|
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:
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.