1. Assessment of Alaska Pollock Stock in the Eastern Bering Sea
The focus of this chapter is on the Eastern Bering Sea (EBS) region. The Aleutian Islands region (Chapter 1A) and the Bogoslof Island area (Chapter 1B) are presented as separate sections. Changes in the input data The 2006 NMFS summer bottom-trawl survey (BTS) abundance at age estimates were compute...
| Main Authors: | , , , , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.152.7518 http://www.afsc.noaa.gov/refm/docs/2006/EBSpollock.pdf |
| Summary: | The focus of this chapter is on the Eastern Bering Sea (EBS) region. The Aleutian Islands region (Chapter 1A) and the Bogoslof Island area (Chapter 1B) are presented as separate sections. Changes in the input data The 2006 NMFS summer bottom-trawl survey (BTS) abundance at age estimates were computed and included for this assessment. Additionally, a time series of estimates was created that included two additional north-west strata. Previously, only the standard 6 strata were included since the additional strata were not covered in 1982-1984 and 1986. Another change to the BTS data included a correction on the assumed standard errors for the annual abundance estimates from 1982-1998. Estimates of pollock biomass from near the surface down to 3m above the bottom were added to the assessment based on the 2006 echo-integration trawl (EIT) survey. Age composition estimates were derived from the population-at-length estimates using the 2006 BTS age-length key. Observer data for age and size composition and average weight-at-age were evaluated for the 2005 fishery and were included in the analyses. The catch-at-age data were recompiled for 1991-2005 to reflect a minor change in the timing of stratification (one stratum running till the end of May instead of the end of June). Total pollock catch for 2005 was estimated from the NMFS Alaska Region data. The |
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