★インフォメーション
2026年度サケ学研究会 特別セミナーのご案内
（終了しました）
サケ学研究会では，北大農学部動物生態と共催で下記のとおりジョイントセミナー（参加無料・事前登録制）を開催することになりましたので，お知らせいたします．
Chris Deeg氏 は現在カナダの水産海洋省（Fisheries and Oceans
Canada）に所属するサケ学研究者で，環境DNAを用いた北太平洋域の大規模サケ科魚類研究についてご紹介いただきます．サケマスの生態や環境DNA技術による海域生態系研究に興味をお持ちの皆様はお気軽にご参加ください．
A special seminar of the Salmon Science Society:
"Environmental DNA Surveys of Marine Pacific Salmon Ecosystems from the
Nearshore to the Open Ocean"
〇 開催日時：2026年5月9日（土）9:00-10:30
〇 演者：Christoph Deeg, Ph.D. (Fisheries and Oceans Canada)
〇 開催方式：Zoomミーティング（先着300名まで）
〇 言語：英語（日本語での質問は受け付け予定）
〇 講演要旨
Environmental DNA (eDNA) has
emerged as an indispensable tool in salmon ecosystem science, capable of characterizing the full food web surrounding salmon — from viruses to whales. Since 2019, we have conducted
large-scale eDNA surveys of the Northeast and central Pacific Ocean to investigate salmon distribution and habitat use during their oceanic winter. These surveys reveal how oceanographic
processes structure ecosystem composition across the Northeast Pacific and how salmon navigate multiple distinct biomes in a species-specific manner. Only “oceanic salmon species” were
associated with mesoscale features linked to elevated primary production in the high seas, such as anticyclonic eddies, while all species converged on the region of the first spring blooms
close to the continental shelf — a rapid ecosystem transition that draws higher trophic levels from salmon through to apex predators. In 2019, we were able to document the impacts of a marine
heatwave that was associated with ecosystem-wide changes and increased cnidarian abundance coinciding with indicators of starvation in Pacific salmon, most pronounced in chum. Complementing
our open-ocean work, monthly nearshore eDNA surveys conducted since 2023 off the coast of Vancouver Island have examined the early marine habitat of Pacific salmon to identify factors
limiting juvenile survival. Combined with extensive traditional survey methods, eDNA documented the seasonal availability of prey and exposure to predators, pathogens, and harmful algae for
juvenile salmon. eDNA based prey abundance compared with stomach contents allowed us to identify prey selectivity amongst juvenile salmon and document shifts in prey selectivity and habitat
use over the first year at sea. We also detected seasonal spikes in environmental pathogen concentrations that coincided with disease outbreaks in free-living young-of-the-year Pacific salmon
— outbreaks exacerbated by open net-pen aquaculture operations in the region. Together, these studies demonstrate eDNA as a powerful, multifaceted tool for salmon stewardship across
life-history stages and ecosystems.
〇 申し込み方法：Googleフォーム（https://forms.gle/BYguiDUYETWR674o9）から参加登録をお願いします。
Zoomミーティングの URL はオンライン登録後にお知らせ致します。
〇 参加登録締切：5月8日（金）12:00
