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
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
Alaska Area 1.718.000 km 2 Coastline 54.563 km Population 710.231 EEZ Area 3.770.021 km 2 Shelf Area 1.319.692 km 2 (*60% of USA )
7,000 – 85,000 USD/day
7,000 – 85,000 USD/day
Anchorage Homer
The Post-Mortem, Pre-Dumpster Sampling Method
The Post-Mortem, Pre-Dumpster Sampling Method
The Post-Mortem, Pre-Dumpster Sampling Method
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The Post-Mortem, Pre-Dumpster Sampling Method ≥ 200 USD/day
Brad Harris and APU Ichthyology Class 2011 - Assessing the prevalence of Ichthyophonus in Southcentral Alaska • Length • Age (otolith) • Sex • Heart tissue sample
• 2012, 2013, 2016, 2017 • Length • Age (otolith) • Gape • Sex • Mass • Muscle δ 13 C and δ 15 N • Heart tissue sample • Heart Mass • BIA • External mucus sample Caitlin Grenier Sarah Webster Sioned Sitkiewicz Anita Kroska Brian Ritchie MSc 2014 MSc 2014 MSc 2018 MSc 2019 MSc 2019 Effects of the parasite Exploring stress hormones as Spatiotemporal assessment of Quantifying Ichthyophonus Size at age and diet Ichthyophonus on groundfish a quantitative assessment for growth in Pacific halibut prevalence and load in Pacific composition of Pacific halibut growth and condition post-release survival halibut in Cook Inlet, Alaska in Cook Inlet, Alaska
Sioned Sitkiewicz Anita Kroska Brian Ritchie Caitlin Grenier Sarah Webster MSc 2018 MSc 2019 MSc 2019 MSc 2014 MSc 2014 Effects of the parasite Exploring stress hormones as Spatiotemporal assessment of Quantifying Ichthyophonus Size at age and diet Ichthyophonus on groundfish a quantitative assessment for growth in Pacific halibut prevalence and load in Pacific composition of Pacific halibut halibut in Cook Inlet, Alaska in Cook Inlet, Alaska growth and condition post-release survival
Female/Male P-M,P-D = 2.25/1 3A = 3.08/1 261 = 3.55/1 261 Sex 2012 + 2013 3A
Mean Age ± SD P-M,P-D = 10.4 ± 3.2 3A = 14.5 ± 3.9 261 = 13.4 ± 3.7 2012 Age (years) 2012 2013
Mean Age ± SD P-M,P-D = 11.1 ± 3.9 3A = 14.8 ± 3.9 261 = 11.4 ± 2.4 2013 Age (years) 2012 2013
Mean Length ± SD P-M,P-D = 88.5 ± 29.7 3A = 94.9 ± 14.1 261 = 93.7 ± 14.4 2012 Length (cm) 2012 2013
Mean Length ± SD P-M,P-D = 87.5 ± 22.5 3A = 95.3 ± 13.8 261 = 92.1 ± 11.1 2013 Length (cm) 2012 2013
The Post-Mortem, Pre-Dumpster Method Initial explorations • Underwood 1997 Careful consideration of spatial and • temporal scales of interpretation
The next step • Examine potential spatial structure in growth performance • IPHC setline survey data for Area 3A • Targeted sampling effort • Participation of sport charter captains Webster et al . (in prep.) Brian Ritchie MSc 2019 Spatiotemporal assessment of growth in Pacific halibut
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
The Post-Mortem, Pre-Dumpster Method Many Thanks Questions?
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