Bivalve mollusc production has been proposed as a method to reduce carbon emissions as (1) a low-emission protein source, and (2) via carbon stored in their shells. Numerous studies have examined the fate of carbon in bivalve production, estimated carbon sequestration rates, and their role in a carbon economy. To address the fate of shell carbon for the Northwest Atlantic, stored oceanic carbon equivalents (Eq), released CO₂via calcification, and hypothetical carbon credit value ($24 tCO₂), for both aquacultured and wild-captured bivalves for New England and Canadian Provinces on the Atlantic between 2016 and 2020 were estimated. Bivalve shells do not sequester atmospheric CO₂, instead storing oceanic CO₂ Eq and cannot be directly included in a carbon sequestration scheme. In the present study, total annual estimates of stored oceanic CO₂ Eq were approximately 202,253 and 363,243 tons, with concurrent releases of approximately 121,255 and 217,771 tons of CO₂ to the atmosphere, of which only 4% and 8% were from aquaculture production in Canada and the United States, respectively. Even if bivalve shells sequestered atmospheric CO₂, current shellfish production levels are inconsequential with regard to current anthropogenic greenhouse gas (GHG) emissions. Stored oceanic carbon Eq for bivalve aquaculture is equivalent to 0.001% and 0.0005% of Canadian and US annual anthropogenic CO₂ emissions, whereas wild-capture would store 0.028% and 0.005% of Canadian and US emission, respectively. Bivalve shell will not solve climate change, but the expansion of bivalve production provides a protein source with the lowest GHG emissions, which provides a multitude of environmental services.