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REGIONS Learn more about the OA research and resources available across Canada: PACIFIC ARCTIC ATLANTIC

RESOURCES New! OA in Canada Paper Learn about OA science, policies, and more in our new paper: OA in Canada: the current state of knowledge and pathways for action New! OA in Canada Publications Database Browse our database of OA in Canada publications. Zotero version available! New! OA CoP Strategic Planning "What We Heard" Report Read the final "What We Heard " report from our OA CoP community strategic planning meeting held in April, 2025! DFO-NOAA Collaboration Resources Explore resources created to highlight the research, activities, and initiatives supported by the DFO/NOAA OA Collaboration! New! Species Impacts Resources Browse our Species Impacts page to learn about our current knowledge of OA impacts of species and seafood industries in Canada! OA Action Plans in Canada Learn more about some of the existing OA action plans in Canada and explore resources to help make your own! Webinars and Videos Want to learn more about OA resources and work happening across Canada? Explore our past webinars and video resources! External Resources Check out our list of OA, climate action, and ocean-based resources from Canada and beyond! New! OA in Canada Expert Database Looking to connect with an OA expert on a particular topic in your area? Explore our expert database! New and improved! Map of Canada's OA Resources Discover more about the people, facilities, current and past projects investigating OA in your area! Ocean Acidification a poem by Samantha Jones The poem “Ocean Acidification” blends science and poetry to explore the challenges a high-CO2 world poses to our world. Share your OA Projects! Working on an OA project you want us to share with the OA community in Canada? Share it here!

BC OAH ACTION PLAN In 2023, the Province of British Columbia published the BC Ocean Acidification and Hypoxia Action Plan . The BC OAH Action Plan was developed in response to a 2019 provincial Preliminary Strategic Climate Risk Assessment (as a part of B.C.’s Climate Preparedness and Adaptation Strategy) that identified ocean acidification as a significant climate change-related risk to the Province's seafood sector. Concurrently, the Province launched the Climate Ready BC Seafood Program , managed by the Tula Foundation, which provides $2 million in funding over two years (April 1, 2024 - March 31, 2026) for eleven projects that support the actions of the BC OAH Action Plan. A BC OAH Action Forum was held on March 3, 2026 to assess achievements of the Climate Ready BC Seafood Program, identify next steps and priority actions needed, and foster collaboration to continue advancing OAH initiatives in BC. Outputs from the forum, including a short documentary on the Climate Ready BC Seafood Program , will be ongoing and can be found on the Forum webpage . Learn more: BC OAH Action Plan Scientific Assessment for the BC OAH Action Plan Climate Ready BC Seafood Program (and documentary! ) BC OAH Action Forum

OA ACTION PLANNING & INITIATIVES IN CANADA BC Ocean Acidification and Hypoxia Action Plan Learn more about the BC OAH Action Plan, Scientific Assessment, and upcoming BC OAH Action Forum! City of Vancouver Case Study (OA Alliance) Learn more about some of the initiatives and concerns involving ocean acidification from the city of Vancouver, BC! Share your OA action initiatives! Working on an OA initiative you want us to share with the OA community in Canada? Share it here! Climate Ready BC Seafood Program The province of BC provided $1.7 million to fund 11 projects on OAH mitigation and adaptation projects in BC. Learn more! Tsleil-Waututh Nation's Climate Action Initiatives (OA Alliance) Learn more about the climate action initiatives from Tsleil-Waututh Nation (Burrard Inlet, BC). BC Ocean Acidification and Hypoxia Action Forum The BC OAH Action Forum (2026) charted next steps on OAH actions in BC. Learn more and stay tuned for ongoing updates! OA CoP Classroom Action Plan Resources Resources for educators and students interested in designing their own OA action plans!

In this webinar, Ph.D. student, Patrick Duke, provides us with an overview of the currently available equipment and sensors for monitoring ocean acidification and considerations to make when selecting sensor packages for your needs, including instrument accuracy, drift, and cost. OA SENSORS (A MEOPAR WEBINAR BY PATRICK DUKE) In this webinar, Ph.D. student, Patrick Duke, provides us with an overview of the currently available equipment and sensors for monitoring ocean acidification, as well as considerations to make when selecting sensor packages for your needs, including instrument accuracy, drift, and cost. Video is fully captioned. To view captions, click on the 'CC' icon in the video viewer.

OUR TEAM CO-LEADS Kristina Barclay Researcher and Program Coordinator Tula Foundation, Hakai Institute Kristina graduated from the University of Alberta with a Ph.D. in Palaeontology at the University of Alberta in 2020. Her research examines the effects of OA on mollusc shells, and predator-prey interactions between molluscs and crabs in both modern and fossil systems. Kristina is also experienced in science outreach and education, having worked in museums and science centres in Alberta in Saskatchewan, and serving as a lead for the geoscience outreach NPO, Time Scavengers. Kristina served as the OA CoP Coordinator from 2020 - 2021, and recently returned to the role after completing a Banting Postdoctoral Fellowship at the University of Victoria examining crab population abundances through time using fossil, archaeological, and modern datasets. Helen Gurney-Smith Research Scientist, Biological Effects Fisheries and Oceans Canada Helen graduated from Bangor University with a B.Sc in Marine Biology and Biochemistry. She obtained her M.Sc in Bioprocessing from the University College London, and received her PhD in Marine Ecology from the University of St Andrews. Helen is currently a Research Scientist in the Biological Effects Section in the Coastal Ecosystems Science Division of Fisheries and Oceans Canada. Her research focuses on the biological effects of climate change on marine organisms and ecosystems. She is currently active in both the Atlantic and Pacific, working with lobsters, shellfish and plankton species. Wiley Evans Oceanography Program Lead Hakai Institute Wiley received a PhD in oceanography from Oregon State University in 2011. He presently manages Hakai research on the globally important issue of ocean acidification and the marine carbonate system. Wiley's research on ocean chemistry in the North Pacific is integrated with other oceanographic research at the Hakai Institute, and helps monitor British Columbia’s ever-changing oceans. Prior to joining Hakai, Wiley was a post-doctoral scientist at University of Alaska-Fairbanks, and a research associate at NOAA’s Pacific Marine Environmental Laboratory. Stay tuned for more updates in 2026 as we continue to re-launch Canada's OA Community of Practice! STEERING COMMITTEE MEOPAR Communities of Practice (CoPs) bring together researchers, practitioners, policy-makers, and community members to share expertise, to learn, and to provide a space for discussion and co-production of knowledge. This priority is underscored by the selection of a Steering Committee representing multiple sectors (government, academia, industry, non-profit), multiple disciplines (chemistry, biology, technological development, social vulnerabilities, policy development) and all regions within Canada (Arctic, Atlantic, and Pacific). Members of the Ocean Acidification Community of Practice Steering Committee (2023) are listed below. Piero Calosi Professor of Marine Biology Université du Québec à Rimouski Piero has been a member of the Global Ocean Acidification Open Network (GOA-ON) Biological Working group since 2015, he has been responsible for the Quebec Center for Biodiversity Science at UQAR since 2016, responsible for the Ocean Acidification Research Axe for the Québec-Ocean FRQ-NT Research Network since 2017, Director of the Institutional Research Group on Nordic Studies BORÉAS since 2018, Invited Lecturer on the «Marine Evolution Under Climate Change» Advanced Course – CeMEB, University of Gothenburg (Sweden), Higher Education Academy of the UK Fellow since 2010, Royal Entomological Society Fellow since 2008. Piero is a member of the Editorial Board for Physiological and Biochemical Zoology, invited editor for Philosophical Transections of the Royal Society B for the special issue on ‘The effect of ocean acidification and climate warming on species potential for adaptation and ecological interactions’ and Evolutionary Applications for the special issue on ‘Transgenerational Plasticity, Epigenetics and the Evolution of Marine Species Under Climate Changes’. Piero is currently a professor at Université du Québec, Rimouski Campus (UQAR) in the Department of Biology, Chemistry and Geography. His current research focus is the investigation of invertebrates' physiological and life-history responses, and the determination of their scope for further adaptation, to multiple global environmental drivers (primarily ocean warming, ocean acidification, de-oxygenation, and changes in salinity). David VanderZwaag Director, Marine & Environmental Law Institute Professor of Law, Canada Research Chair (Tier 1) - Ocean Law & Governance, Dalhousie University David is Director of the Marine & Environmental Law Institute, Dalhousie University, where he is Professor of Law and Canada Research Chair (Tier 1) in Ocean Law and Governance. He is a member of the IUCN World Commission on Environmental Law and its Specialist Group on Oceans, Coasts and Coral Reefs. His research interests include: ocean acidification law and policy, adaptive fisheries and aquaculture governance, climate mitigation, marine spatial planning and marine species at risk protection. Nico Prins Executive Director B.C. Shellfish Growers Association Biography coming soon... Name Position Insitution/Affiliation More members and updates coming soon... OA COP ALUMNI Brent Else (Co-Lead) Professor of Geography University of Calgary, MEOPAR Courtenay E. Parlee (Steering Committee) Research Scientist, Ecosystems and Ocean Science Fisheries and Oceans Canada Denise Joy (Steering Committee) Manager Aquatic Climate Change Adaptation Services, Fisheries and Oceans Canada Jim Russell (Steering Committee) Executive Director BC Shellfish Growers Association Darlene Winterburn (Steering Committee) Executive Director BC Shellfish Growers Association Austin Pugh (Coordinator) Climate and Ecosystems Coordinator NERACOOS Alyssa Dunbar (Steering Committee) Research Scientist, Ecosystems and Ocean Science Fisheries and Oceans Canada Joseph Needoba (Steering Committee) Senior Staff Scientist Ocean Networks Canada Heather Almeda (Coordinator) Barbara Paterson (Steering Committee) Research Associate St. Mary's University Patrick Duke (Steering Committee - Student Rep.) Head of Field CarbonRun Kumiko Azetsu-Scott (Steering Committee) Research Scientist Fisheries and Oceans Canada Jennifer Silver (Steering Committee) Associate Professor Geography, Environment, and Geomatics, University of Guelph Richard Dewey (Steering Committee) Associate Director Science Services Ocean Networks Canada

OA IN CANADA PUBLICATIONS DATABASE The OA CoP has compiled a bibliographic database of publications concerning ocean acidification in Canadian waters (produced primarily by authors at Canadian institutions). There are two main ways to access this database: View, search, and export citations from a public version of this database available on Zotero (click here to view ). If you do not wish to use Zotero, you can view a Google Spreadsheet of the data (including links to DOI/URLs of the publications) directly on this webpage (see below). The database is updated regularly, but if you know of a publication that you believe is missing from our database, please let us know ! The following is a Google Spreadsheet version of the bibliographic database available on Zotero . There is an option to scroll vertically as well as horizontally through the columns. To search the spreadsheet, use CTRL+F (the Zotero version has better built-in search capabilities). Data for each publication listed here includes: authors year title publication type (e.g., report, journal article, book chapter, etc.) publication title (e.g., journal or book name) volume and page/article numbers keywords (when available) abstracts (as applicable) the OA related topic and geographical region(s) covered, whether the publication is freely accessible (open access) links to the publication (e.g., DOI)

PACIFIC OCEAN ACIDIFICATION AND HYPOXIA IN BRITISH COLUMBIA RESOURCES The BC Ocean Acidification and Hypoxia Action Plan Learn more about the BC OAH Action Plan, Climate Ready BC Seafood Program, and ongoing OAH action initiatives in BC! Map of Canada's OA Resources Explore OA monitoring assets, experimental infrastructure, and modelling domains in your region! OA in Canada Paper Learn more about OA science, policies, and more: OA in Canada: the current state of knowledge and pathways for action StoryMap Coming soon! The Climate Ready BC Seafood Program Learn more about the Climate Ready BC Seafood Program, projects, and ongoing OA initiatives and action planning in BC! Species Impacts Learn more about how Pacific species in Canada are impacted by OA! Share your project! Collecting OA data in Pacific Canada? Have an ongoing (or past) OA project? We want to hear from you! The BC Ocean Acidification and Hypoxia Action Forum The BC OAH Action Forum (2026) charted next steps on OAH actions in BC. Learn more and stay tuned for ongoing updates! Find an Expert Looking to connect with an OA expert in your area? Check out or OA in Canada Expert Database! From the Blog Explore our updates and blog stories from Pacific Canada! Atlantic Blog Feed FROM THE BLOG BC OAH Action Forum Executive Summary Report Now Available! OA CoP Jun 8 Storytelling Illustrations from BC OAH Action Forum OA CoP May 11 New animation: Ocean Acidification and Hypoxia in BC OA CoP Apr 22 New Short Documentary: the Climate Ready BC Seafood Program OA CoP Apr 14 New Paper: Ocean Acidification in Canada: the current state of knowledge and pathways for action OA CoP Feb 13 OA Day of Action 2026 OA CoP Jan 8 1 2 3 4 5

EVENTS Upcoming Events Past Events Webinars Other Useful Events UPCOMING EVENTS UPCOMING EVENTS Geological Association of Canada - Mineralogical Association of Canada GAC-MAC) Annual Meeting (May 25 - 28, 2026, St. John's NL) Session of Interest: Ocean Acidification and its consequences: past, present and future (ss-20 Environmental Geology) Session description: Ocean Acidification (OA), the broadscale change in ocean pH associated with changes in atmospheric chemistry, is considered the “evil twin” of modern anthropogenic climate change. Recent re-analyses of mass extinction events and other events in the deep-time history of Earth have revealed tight linkages between atmospheric/ocean temperature and chemistry change and biotic consequences, with long-term evolutionary responses in some cases. A deeper understanding of the chronologies and mechanisms of these atmospheric/ocean chemistry changes and their biotic consequences in the past is valuable for understanding OA in the Anthropocene, and modelling OA responses in the 21st century and beyond. This special session seeks submissions investigating all aspects of OA and its ecological, evolutionary, oceanographic and stratigraphic consequences, throughout Earth History. Conference website: https://event.fourwaves.com/stjohns2026/pages or https://gac.ca/events/gac-mac-annual-meeting/ The Ocean in a High-CO2 World Ocean Acidification 6th International Science Symposium (October 13 - 16, 2026, Wellington, New Zealand) About the Symposium (from website): "Ocean acidification remains a central theme of the symposium series. This edition will also expand to consider other ocean climate impacts, such as ocean warming and deoxygenation, particularly in a multiple-driver context. Research on marine carbon dioxide removal interventions, which are suggested to mitigate climate change and ocean acidification, will also be a key part of the conference." Themes: Beyond tipping points - translating science to action Global-driven changes in biodiversity and ecosystem resilience Multiple stressors' effects on marine organisms Ocean-based solutions Technological advances in marine climate change research The modulating role of time - from short-term variability to evolution Working across knowledge systems in a high-CO₂ world Abstracts are due April 1, 2026. Call for abstracts Special Sessions - includes "Ocean acidification multiple stressor effects on North American species" PAST EVENTS PAST EVENTS BC OAH Action Forum March 3, 2026 The BC Ocean Acidification and Hypoxia (OAH) Action Forum, hosted by the Tula Foundation, aimed to chart progress made and next steps for BC's OAH Action Plan. Learn more... Past Webinars Browse and view our past webinars here! PAST EVENT UPDATES BC OAH Action Forum Executive Summary Report Now Available! OA CoP Jun 8 Storytelling Illustrations from BC OAH Action Forum OA CoP May 11 New Short Documentary: the Climate Ready BC Seafood Program OA CoP Apr 14 OA Day of Action 2026 OA CoP Jan 8 October 2025 Updates OA CoP Oct 29, 2025 OA Week 2025 OA CoP Oct 27, 2025 OA CoP Strategic Planning "What We Heard" Report OA CoP Oct 14, 2025 September 2025 Updates OA CoP Sep 29, 2025 August 2025 Updates OA CoP Aug 28, 2025 1 2 3 4 5 OTHER USEFUL EVENTS OTHER USEFUL EVENTS MEOPAR Events GOA-ON Events OA Alliance Events The MEOPAR Ocean Acidification Community of Practice takes no responsibility for the content, publications, products, funders, or services of linked websites, nor any views expressed on external sites. Links to other websites are included for resource sharing, transparency and convenience only.

SPECIES IMPACTS There are many species in Canada that are vulnerable to ocean acidification. Across the country, research is being conducted to understand how species respond to OA (and other co-stressors, such as changing ocean temperature and oxygen levels), but there are still many unknowns . Below are resources summarizing our current understanding of how species are responding to OA in Canada, including our newly published OA in Canada paper with a full list of species responses! Explore Full Responses Explore by Species Industry Impacts Explore by Region OA IN CANADA SPECIES RESPONSES FROM BARCLAY, GURNEY-SMITH ET AL., 2026 Calcification Growth Survival Reproduction Physiology Ecosystem Role Economic Role Pacific Arctic Atlantic References Plankton Sea - ice microbes NE ●● NE ●● Basal food web, mixotrophs ●● (1,2) Phytoplankton ▲ ●○ M ●● M ( ▼ - NE) ●● Basal food web, primary producers ● ●●● ●●● ( 3 – 13) Foraminifera NE ●● Basal food web, mixotrophs Ø Ø ● (9) Arthropods (copepods, amphipods) M ( ▼ - NE) ●● Basal food web, consumers Ø ● ● ( 12,14) Pteropods (shelled) Limacina helicina ▼ ●○ M ( ▼ - NE) ●●● Basal food web, consumers ●● ●● ● ( 9,15 – 18) Pteropods (non - shelled) M (NE - ▲ ) ●● Basal food web, consumers ● Ø Ø ( 16) Pelagic species Salmon, Pacific pink Oncorhynchus gorbuscha M ( ▼ - NE) ●● NE ●● ▼ ●● Predator C, R, F ●● ( 19,20) Salmon, Pacific chum Oncorhynchus keta ▼ ●● ▼ ●● Predator C, R ● ( 21) Herring, Pacific Clupea pallasii NE ●● M ( ▼ - NE) ●○ ▼ ●● Planktivore C, R ● ( 22) Stickleback, Three - spined Gasterosteus aculeatus ▼ ●● Omnivore ● Ø ( 23) Redfish Sebastes fasciatus NE ●● NE ●● M ( ▼ - NE) ●○ Predator C, R ● (24) Benthic species Shrimp, northern Pandalus borealis M ( ▼ - NE) ●●○ M ( ▼ - NE) ●●○ Omnivore C, R Ø Ø ●●● ( 25 – 29) Crab, Dungeness Metacarcinus magister ▼ ●●○ Predator C, R ●● (30,31) Crab, European green Carcinus maenus ▼ ●● Predator I ● Ø (32) Crab, yellow shore Hemigrapsus oregonensis ▼ ●● Omnivore ● (33) Lobster, American Homarus americanus M ( ▼ - NE) ●● M ( ▼ - NE) ●● ▼ ●●● Predator C, R ●●● ( 34 – 38) Amphipods ▼ ●● ▼ ●●● Omnivore I ● ● ( 39,40) Clam, softshelled Mya arenaria M ( ▼ - NE) ●○ ▼ ●● M ( ▼ - NE) ●●○ M ( ▼ - NE) ●●○ Suspension feeder R, F Ø ●●● (40 – 45) Mussel, blue Mytilus edulis ▲ ●● NE ●●○ NE ●● NE ●● Habitat former, suspension feeder R, F Ø ●● ( 46,47) Mussel, Pacific blue Mytilus trossulus M ( ▼ - NE) ●● ▼ ●●● ▼ ●● NE ●● Habitat former, suspension feeder R, F ●●● ( 48 – 51) Mussel, Mediterranean Mytilus galliprovincialis ▼ ●● NE ●● Habitat former, suspension feeder F ● (51) Oyster, Eastern Crassostrea virginica M ( ▼ - NE) ●● ▼ ●● ▲ ●● ▲ ●● NE ●● Habitat former, suspension feeder C, R, F ●●● (52 – 54) Oyster, Pacific Crassostrea gigas ▼ ●●○ ▼ ●●○ * ▲ ●●○ ▼ ●● H abitat former, suspension feeder R, F ●●● ( 55 – 57) Abalone, northern/pinto Haliotis kamtschatkana ▼ ●● ▼ ●● ▼ ●● NE ●● H erbivore E ● ( 58) Snail, northern moon Euspira heros M ( ▼ - NE) ●● Predator R ● ( 59) Snail, common periwinkle Littorina littorea M ( ▼ - NE) ●● Herbivore R ● ( 59) Snail, frilled dogwhelk Nucella lamellosa M ( ▼ - NE) ●● Predator ● (60) Snail, Eastern mud Illyanassa obsoleta M ( ▼ - NE) ●● NE ●● M ( ▼ - NE) ●● Detritivore ● (40) Sponges ▼ ●● ▼ ●● ▼ ●● ▼ ●●○ Habitat former, suspension feeder ●● Ø ● (50,61,62) Sea star, common Asterias rubens ▼ ●● Predator ● ( 46) Sea star, ochre Pisaster ochraceus ▼ ●● ▲ ●● ▲ ●● Predator ● (63) Urchin, red Mesocentrotus franciscanus ▼ ●● M ●● Herbivore C, R ●● ( 48,64) Sea cucumber, northern Cucumaria frondosa ▼ ●● ▼ ●● ▼ ●● ▼ ●● NE ●● Detritivore C, R Ø ● ( 65) Deep sea polychaete Op hryotrocha sp. NE ●● ▼ ●● ▼ ●●● ▼ ●● Detritivore Ø Ø ●● (66) Bryozoan, kelp/lacy Membranipora membranacea ▲ ●●○ NE ●●○ Biofouling, suspension feeder I ●● Ø (49, 50) Tunicate, colonial sea squirt Didemnum sp. NE ●● NE ●● Biofouling, suspension feeder I ● Ø (50) Tunicate, star Botryllus schlosseri ▼ ●● Biofouling, suspension feeder I ● Ø (50) Parasites Trematode parasite Himasthla sp. ▼ ●● Parasite ● Ø Ø ( 67) Mud blister worm Polydora websteri M ( ▼ - NE) ●● Parasite ● (52) Marine vegetation Coralline algae NE ●●○ NE ●●○ NE ●● Primary producer , habitat former ● ● ●● ( 68 – 70) Rockweed Fucus distichus ▼ ●● NE ●● NE ●● Primary producer , habitat former ● Ø Ø (71) Figure 4. (Barclay, Gurney-Smith et al., 2026). Table showing species responses to OA from studies conducted in Canada. Responses are: ▼ – negative, ▲ – positive, NE – no effect, M – mixed (positive, negative, no effect), M (▼ - NE) – mixed (negative - no effect), M (NE - ▲) – mixed (no effect -positive), * - Selectively bred oysters showed increased resilience to OA. Confidence levels follow the style of IPCC WG II (IPCC, 2023) in terms of number of studies and are: ● – low, ●○ – medium low, ●● – medium, ●●○ – medium high, ●●● – high. Economic Role abbreviations: C – commercial fishery, R – recreational fishery, F – farmed/aquaculture, I – invasive species, E – endangered species. Ranges (Pacific, Arctic, Atlantic): ● – present, low evidence (1 study), ●● – present, medium evidence (2 studies), ●●● – present, high evidence (3+ studies), Ø – present, no data. View paper here: https://doi.org/10.3389/fmars.2026.1761703 OA IN CANADA SPECIES SPOTLIGHTS American lobster Download our poster here! Pacific oyster Download our poster here! Pink salmon Download our poster here! Northern shrimp Download our poster here! Dungeness crab Download our poster here! Other Species Download our poster here! VIEW ALL POSTERS More species coming soon! EXPLORE MORE PAST POSTS FROM OUR MEET THE CRITTERS BLOG SERIES New Short Documentary: the Climate Ready BC Seafood Program New Paper: Ocean Acidification in Canada: the current state of knowledge and pathways for action OA in Canada Species Impacts: Dungeness Crab 1 2 3 4 5 FISHERIES AND AQUACULTURE IMPACTS Seafood Industry Download our poster here! $1,764 $889 $312 $119 $109 $68 $45 $31 $14 $500 $365 $196 $54 $29 $0.2 $0 $200 $400 $600 $800 $1,000 $1,200 $1,400 $1,600 $1,800 Lobster Salmon Shrimp Crab (Other) Clams Oyster Mussels* Herring Sea urchin Queen/snow crab Groundfish Scallop Pelagic fish (other) Shellfish (other) Others Value (Millions, CDN) Canada Seafood Industries ($4.5B) - Vulnerability to OA ■ Negative ($2.21B, 49%) ■ Mixed (negative - no effect) ($1.03B, 23%) ■ Mixed ($113M, 3%) ■ Unknown in Canada ($1.14B, 25%) FAST FACTS 25% ($1.14B) of seafood species in Canada require more research on OA impacts , such as: Queen/snow crab (11% or $500M) Scallops (4% or $196M) Fish ( 10% or $419M) 49% ($2.21B) of seafood species are negatively impacted by OA 23% ($1.03B) have reported mixed negative effects (negative - no effect) 3% ($113M) have mixed responses (negative - positive) Values reported here are based on seafisheries landings values and aquaculture production values reported by DFO in 2023: 1. https://www.dfo-mpo.gc.ca/stats/commercial/land-debarq/sea-maritimes/s2023pv-eng.htm 2. https://www.dfo-mpo.gc.ca/stats/aqua/aqua23-eng.html *Mussels include aquaculture only Seafood Industry Impacts by Province FISHERIES AND AQUACULTURE IMPACTS BY PROVINCE BC QC NB PEI NS NL $528 $73 $114 $80 $16 $4 $5 $8 $148 $1 $6 $9 $0 $100 $200 $300 $400 $500 $600 Salmon Shrimp Crab (Other) Clams Oyster Mussels* Herring Sea urchin Groundfish Scallop Pelagic fish (other) Shellfish (other) Value (Millions, CDN) BC Seafood Industries ($992M) - Vulnerability to OA ■ Negative ($195M, 20%) ■ Mixed (negative - no effect) ($613M, 62%) ■ Mixed ($21M, 2%) ■ Unknown in Canada ($164M, 16%) $242 $15 $2 $1 $3 $0.4 $1 $5 $78 $13 $3 $0.4 $0 $50 $100 $150 $200 $250 Lobster Shrimp Crab (Other) Clams Oyster Mussels* Herring Sea urchin Queen/snow crab Groundfish Scallop Pelagic fish (other) Value (Millions, CDN) Quebec Seafood Industries ($360M) - Vulnerability to OA ■ Negative ($264M, 73%) ■ Mixed (negative - no effect) ($2M, 1%) ■ Mixed ($3M, 1%) ■ Unknown in Canada ($94M, 26%) $290 $258 $3 $1 $0.2 $26 $4 $1 $68 $2 $15 $4 $0 $50 $100 $150 $200 $250 $300 Lobster Salmon Shrimp Crab (Other) Clams Oyster Herring Sea urchin Queen/snow crab Groundfish Scallop Pelagic fish (other) Value (Millions, CDN) NB Seafood Industries ($673M) - Vulnerability to OA ■ Negative ($295M, 44%) ■ Mixed (negative - no effect) ($263M, 39%) ■ Mixed ($26M, 4%) ■ Unknown in Canada ($89M, 13%) $290 $2 $1 $19 $29 $2 $24 $1 $0.04 $4 $0 $50 $100 $150 $200 $250 $300 Lobster Crab (Other) Clams Oyster Mussels* Herring Queen/snow crab Groundfish Scallop Pelagic fish (other) Value (Millions, CDN) PEI Seafood Industries ($372M) - Vulnerability to OA ■ Negative ($291M, 78%) ■ Mixed (negative - no effect) ($3M, 1%) ■ Mixed ($48M, 13%) ■ Unknown in Canada ($30M, 8%) $821 $103 $69 $1 $27 $4 $3 $10 $77 $120 $174 $27 $0 $100 $200 $300 $400 $500 $600 $700 $800 $900 Lobster Salmon Shrimp Crab (Other) Clams Oyster Mussels* Herring Queen/snow crab Groundfish Scallop Pelagic fish (other) Value (Millions, CDN) NS Seafood Industries ($1.4B) - Vulnerability to OA ■ Negative ($891M, 62%) ■ Mixed (negative - no effect) ($140M, 10%) ■ Mixed ($7M, 0.5%) ■ Unknown in Canada ($397M, 28%) $121 $153 $8 $9 $1 $253 $82 $3 $13 $20 $0.2 $0 $50 $100 $150 $200 $250 $300 Lobster Shrimp Mussels* Herring Sea urchin Queen/snow crab Groundfish Scallop Pelagic fish (other) Shellfish (other) Others Value (Millions, CDN) NL Seafood Industries ($662M) - Vulnerability to OA ■ Negative ($271M, 41%) ■ Mixed (negative - no effect) ($9M, 1%) ■ Mixed ($8M, 1%) ■ Unknown in Canada ($371M, 56%) EXPLORE SPECIES IMPACTS BY REGION PACIFIC Pacific oyster Download our poster here! Pink salmon Download our poster here! Northern shrimp Download our poster here! Dungeness crab Download our poster here! Other Species Download our poster here! ARCTIC Northern shrimp Download our poster here! Other Species Download our poster here! ATLANTIC American lobster Download our poster here! Northern shrimp Download our poster here! Other Species Download our poster here Seafood Industry Impacts by Province REFERENCES See our OA in Canada Publications Database 1. Monier A, Findlay HS, Charvet S, Lovejoy C. Late winter under ice pelagic microbial communities in the high Arctic Ocean and the impact of short-term exposure to elevated CO2 levels. Frontiers in Microbiology [Internet]. 2014;5:490. Available from: https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2014.00490 2. Torstensson A, Margolin AR, Showalter GM, Smith WO, Shadwick EH, Carpenter SD, et al. Sea-ice microbial communities in the Central Arctic Ocean: Limited responses to short-term pCO2 perturbations. Limnology and Oceanography [Internet]. 2021;66(S1):383–400. Available from: https://aslopubs.onlinelibrary.wiley.com/doi/abs/10.1002/lno.11690 3. Hattenrath-Lehmann TK, Smith JL, Wallace RB, Merlo LR, Koch F, Mittelsdorf H, et al. The effects of elevated CO2 on the growth and toxicity of field populations and cultures of the saxitoxin-producing dinoflagellate, Alexandrium fundyense. Limnology and Oceanography [Internet]. 2015;60(1):198–214. Available from: https://aslopubs.onlinelibrary.wiley.com/doi/abs/10.1002/lno.10012 4. Mélançon J, Levasseur M, Lizotte M, Scarratt M, Tremblay JÉ, Tortell P, et al. Impact of ocean acidification on phytoplankton assemblage, growth, and DMS production following Fe-dust additions in the NE Pacific high-nutrient, low-chlorophyll waters. Biogeosciences [Internet]. 2016;13(5):1677–92. 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