The Origins of Chum Salmon Bycatch in the 1994 Bering Sea Trawl Fishery for Walleye Pollock Determined by Genetic Stock Identification
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Genetic Techniques Provide Evidence of Chinook Salmon Feeding on Walleye Pollock Offal
Declining runs of Chinook salmon in western Alaska have focused interest on the ocean condition and food habits of Chinook salmon in the Bering Sea, including potential mortality from bycatch in the pollock fishery. Examination of Chinook salmon stomach contents collected in the eastern Bering Sea by the U.S. North Pacific Groundfish Observer Program (NOAA Fisheries) revealed isolated pieces of...
متن کاملSpatial and Temporal Variability in Size at Maturity of Walleye Pollock in the Eastern Bering Sea
—Size at maturity is incorporated into stock assessments of walleye pollock Theragra chalcogramma. For eastern Bering Sea walleye pollock, however, this important biological variable has not been examined since 1976 and possible interannual and geographic variations have never been evaluated. Maturity condition and fish length data were collected from 10,197 walleye pollock aboard factory trawl...
متن کاملEstimation of Age-Specific Migration in an Age-Structured Model
The standard Eastern Bering Sea (EBS) walleye pollock (Theragra chalcogramma) age-structured stock assessment model has no spatial dimension. To better understand its dynamics on finer spatial and temporal scales, an age-specific movement (ASM) model was developed. The ASM model stratifies the assessment data into two regions (northwest [NW] and southeast [SE] EBS), includes movement, and allow...
متن کاملStock-Specific Distribution and Abundance of Immature Chinook Salmon in the Western Bering Sea in Summer and Fall 2002–2004
Seasonal stock-specific distribution and abundance of Chinook salmon (Oncorhynchus tshawytscha) were determined using scale pattern analysis of Bering-Aleutian Salmon International Survey (BASIS) samples and catch data collected in the western Bering Sea in summer 2003 and fall 2002–2004. Chinook salmon were sparsely distributed in this region, which greatly limited the number of samples availa...
متن کاملStock-Specific Distribution and Abundance of Immature Sockeye Salmon in the Western Bering Sea in Summer and Fall 2002–2004
Seasonal stock-specific distribution and abundance of immature sockeye salmon (Oncorhynchus nerka) in the western Bering Sea in summer 2003 and fall 2002-2004 were determined using scale pattern analysis of Bering-Aleutian Salmon International Survey (BASIS) samples. Most (nearly 100%) of the sockeye salmon in BASIS catches were immature. Four age groups, 1.1, 1.2, 2.1 and 2.2, accounted for mo...
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