The Post-Mortem, Pre-Dumpster Sampling Method: Using Post-Processed - - PowerPoint PPT Presentation

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The Post-Mortem, Pre-Dumpster Sampling Method: Using Post-Processed - - PowerPoint PPT Presentation

Apr 15, 2023 126 likes •464 views

The Post-Mortem, Pre-Dumpster Sampling Method: Using Post-Processed Carcasses as a Data Source for Investigations of Marine Fish Species Nathan Wolf Fisheries, Aquatic Science, and Technology Laboratory Alaska Pacific University Anchorage,

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The Post-Mortem, Pre-Dumpster Sampling Method: Using Post-Processed Carcasses as a Data Source for Investigations of Marine Fish Species

Nathan Wolf Fisheries, Aquatic Science, and Technology Laboratory Alaska Pacific University Anchorage, Alaska USA

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Marine Fish Research on the Last Frontier . . . . . . on a Shoestring Budget

Nathan Wolf Fisheries, Aquatic Science, and Technology Laboratory Alaska Pacific University Anchorage, Alaska USA

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Alaska

Area 1.718.000 km2 Coastline 54.563 km Population 710.231 EEZ Area 3.770.021 km2 Shelf Area 1.319.692 km2

(*60% of USA )

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7,000 – 85,000 USD/day

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7,000 – 85,000 USD/day

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Anchorage Homer

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The Post-Mortem, Pre-Dumpster Sampling Method

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The Post-Mortem, Pre-Dumpster Sampling Method

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The Post-Mortem, Pre-Dumpster Sampling Method

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=

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= data

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The Post-Mortem, Pre-Dumpster Sampling Method ≥ 200 USD/day

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Brad Harris and APU Ichthyology Class 2011 - Assessing the prevalence of Ichthyophonus in Southcentral Alaska

  • Length
  • Age (otolith)
  • Sex
  • Heart tissue sample
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  • 2012, 2013, 2016, 2017
  • Length
  • Age (otolith)
  • Gape
  • Sex
  • Mass
  • Muscle δ13C and δ15N
  • Heart tissue sample
  • Heart Mass
  • BIA
  • External mucus sample

Sarah Webster MSc 2014 Size at age and diet composition of Pacific halibut in Cook Inlet, Alaska Caitlin Grenier MSc 2014 Quantifying Ichthyophonus prevalence and load in Pacific halibut in Cook Inlet, Alaska Sioned Sitkiewicz MSc 2018 Effects of the parasite Ichthyophonus on groundfish growth and condition Anita Kroska MSc 2019 Exploring stress hormones as a quantitative assessment for post-release survival Brian Ritchie MSc 2019 Spatiotemporal assessment of growth in Pacific halibut

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Sarah Webster MSc 2014 Size at age and diet composition of Pacific halibut in Cook Inlet, Alaska Caitlin Grenier MSc 2014 Quantifying Ichthyophonus prevalence and load in Pacific halibut in Cook Inlet, Alaska Sioned Sitkiewicz MSc 2018 Effects of the parasite Ichthyophonus on groundfish growth and condition Anita Kroska MSc 2019 Exploring stress hormones as a quantitative assessment for post-release survival Brian Ritchie MSc 2019 Spatiotemporal assessment of growth in Pacific halibut

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2012 + 2013 Sex 261 3A Female/Male P-M,P-D = 2.25/1 3A = 3.08/1 261 = 3.55/1

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2012 2013 Age (years) 2012 Mean Age ± SD P-M,P-D = 10.4 ± 3.2 3A = 14.5 ± 3.9 261 = 13.4 ± 3.7

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2012 2013 Age (years) Mean Age ± SD P-M,P-D = 11.1 ± 3.9 3A = 14.8 ± 3.9 261 = 11.4 ± 2.4 2013

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2012 2013 Length (cm) 2012 Mean Length ± SD P-M,P-D = 88.5 ± 29.7 3A = 94.9 ± 14.1 261 = 93.7 ± 14.4

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2012 2013 Length (cm) Mean Length ± SD P-M,P-D = 87.5 ± 22.5 3A = 95.3 ± 13.8 261 = 92.1 ± 11.1 2013

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The Post-Mortem, Pre-Dumpster Method

  • Initial explorations
  • Careful consideration of spatial and

temporal scales of interpretation

Underwood 1997

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  • Examine potential spatial structure in

growth performance

  • IPHC setline survey data for Area 3A
  • Targeted sampling effort
  • Participation of sport charter

captains

The next step

Webster et al. (in prep.)

Brian Ritchie MSc 2019 Spatiotemporal assessment of growth in Pacific halibut

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The Post-Mortem, Pre-Dumpster Method

Low Cost Accurate Potential for frequent sampling Requires active sport and/or charter fleet participation

  • Initial explorations

+ +/- +

  • Careful consideration of spatial and

temporal scales of interpretation

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The Post-Mortem, Pre-Dumpster Method

Many Thanks Questions?