Bert Lewis
Alaska Department of Fish and Game
6 Papers
8 Citations
Bert Lewis is an academic researcher from Alaska Department of Fish and Game. The author has contributed to research in topics: Oncorhynchus & Hatchery. The author has an hindex of 5, co-authored 5 publications.
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Papers
Changes in Size and Age of Chinook Salmon Oncorhynchus tshawytscha Returning to Alaska.
TL;DR: Decadal trends in length and age at maturity in ten datasets from commercial harvests, weirs, and spawner abundance surveys of Chinook salmon Oncorhynchus tshawytscha throughout Alaska found that on average these fish have become smaller over the past 30 years, because of a decline in the predominantAge at maturity and because of of a decrease in age-specific length.
Source-sink estimates of genetic introgression show influence of hatchery strays on wild chum salmon populations in Prince William Sound, Alaska.
James R. Jasper,Christopher Habicht,Steve Moffitt,Rich Brenner,Jennifer M. Marsh,Bert Lewis,Elisabeth Creelman Fox,Zac Grauvogel,Serena D. Rogers Olive,W. Stewart Grant +9 more
TL;DR: A novel application of the classical source-sink model is used to compare SNP allele frequencies in these archived fish-scales (1964–1982) with frequencies in contemporary samples (2008–2010) and found a temporal shift toward hatchery allele frequency frequencies in some wild populations.
Homing of Sockeye Salmon within Hidden Lake, Alaska, Can Be Used to Achieve Hatchery Management Goals
TL;DR: This study focuses on stock enhancement of Sockeye Salmon O. nerka in Hidden Lake, Alaska, where the Trail Lakes Hatchery supplements the natural population with hatchery-raised fry.
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Declines in body size of sockeye salmon associated with increased competition in the ocean
TL;DR: This article quantified changes in mean body size and contributions from shifting size-at-age and age structure of mature sockeye salmon returning to Bristol Bay, Alaska, over the past 60 years.
Demographic changes in Chinook salmon across the Northeast Pacific Ocean
TL;DR: In this article, the authors quantified changes in the demographic structure of Chinook salmon populations over the past four decades across the Northeast Pacific Ocean, from California through western Alaska, and found that wild and hatchery fish are becoming smaller and younger throughout most of the Pacific coast.