SAFS hosts weekly lunch-time seminars, where students and faculty share findings from their current research. Read through our past seminars to get an idea of topics covered and be sure to check out our events calendar to download upcoming seminars on your calendar.

Any recordings will be uploaded below and on the SAFS YouTube.

Autumn 2026 Quantitative Seminars

Tuesdays at 2:30-3:30 pm in FSH 207.

 

Option to join the seminars remotely via Zoom is available.

10/06/26 – CANCELLED

Apryle D. Craig (Cramer Fish Sciences)

10/13/26

Sophia Wassermann (Alaska Fisheries Science Center)

TITLE: A two-gear problem: combining acoustic and bottom-trawl indices to address spatiotemporal variation in catchability

ABSTRACT: For semipelagic fishes, relying on multiple survey gear types to monitor a single population can increase bias and uncertainty in population estimates. Walleye pollock in the eastern Bering Sea is monitored with three fishery-independent sources of information: an acoustic-trawl survey (AT), a multispecies bottom-trawl survey (BT), and the acoustic vessel of opportunity (AVO) index derived from echosounders mounted on the bottom trawl survey vessels. Building on the vertically integrated index developed by Monnahan et al. (2021), we leveraged a novel ridge correction method in RTMB to stabilize and accelerate model convergence. Additionally, incorporating the AVO reduced uncertainty around the estimated availability of pollock to the AT and BT surveys in years without dedicated midwater sampling. This approach provides a framework for a vertically integrated index of abundance that is feasible on an operational timescale.

10/20/26

Ray Hilborn (UW, SAFS)

TITLE: Genetic mark recapture estimates of tuna without seeing the marked fish

ABSTRACT: Tuna populations have not historically been amenable to traditional fishery independent surveys of abundance, but in recent decades a genetic method known as close kin mark recapture (CKMR) has been applied and provides estimates of the absolute population size. In this talk I will discuss some of the limitations of CKMR when applied to Atlantic bluefin tuna, and suggest an alternative form of traditional mark recapture that makes alternative, and possibly more estimable, assumptions. The essence of the method is to use larval sampling data to identify parents, who are then subsequently harvested. So the “marked” population was never seen, only their existence was observed by their genetic signature in their offspring.

10/27/26

Kristin Braziunas

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11/03/26

Heili Lowman (UW, SAFS)

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11/10/26

Brendan Wallace

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11/17/26

Maurice Goodman

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12/01/26

Ray Hunter

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12/08/26

Abigail Golden

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Archived Quantitative Seminars

Past seminar recordings can be found on our YouTube channel Quantitative Seminar playlist

Autumn 2026 Seminars
Spring 2026 Seminars
Winter 2026 Seminars
Autumn 2025 Seminars
Spring 2025 Seminars
Winter 2025 Seminars
Autumn 2024 Seminars
Spring 2024 Seminars
Winter 2024 Seminars
Autumn 2023 Seminars
Spring 2023 Seminars
Winter 2023 Seminars
Autumn 2022 Seminars
Spring 2022 Seminars
Winter 2022 Seminars
Autumn 2021 Seminars
Spring 2021 Seminars
Winter 2021 Seminars
Autumn 2020 Seminars
Spring 2020 Seminars
Spring 2015 Seminars