The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners.
As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.
i
Results of the March 2018 Acoustic-Trawl Survey of Walleye Pollock (Gadus chalcogrammus) Conducted in the Southeastern Aleutian Basin Near Bogoslof Island, Cruise DY2018-02
-
2018
-
Series: AFSC processed report ; 2018-07
[PDF-3.50 MB]
Details:
-
Personal Author:
-
Corporate Authors:
-
NOAA Program & Office:
-
Description:Scientists from the Alaska Fisheries Science Center conducted an acoustic-trawl survey in early March 2018 to estimate the abundance of pre-spawning walleye pollock (Gadus chalcogrammus) in the southeastern Aleutian Basin near Bogoslof Island. Thirty-five transect lines were surveyed, and 5 trawl hauls were conducted for biological measurements in the eastern Umnak region. Mechanical problems with the trawl-winch system prevented any trawling in the western Samalga region. This report summarizes the observed pollock distribution and biological information, and provides an abundance estimate used for stock assessment. The estimated numbers of pollock in 2018 were 964 million fish with a biomass of 663 thousand metric tons (t). This was a 31% increase in biomass from the 2016 estimate (507 thousand t). Most pollock were 60 cm or smaller with a mode at 49 cm fork length. Sixty-eight percent of the pollock biomass were from the 2009-2010 year classes.
-
Keywords:
-
Series:
-
Document Type:
-
Place as Subject:
-
Name as Subject:
-
Rights Information:Public Domain
-
Compliance:Submitted
-
Main Document Checksum:
-
Download URL:
-
File Type:
