There is insufficient evidence to develop global projections of future climate impacts on humans through changes in non-food consumable marine products, but specific local examples have been investigated, such as the Arctic ooligan , a small smelt fish. Ooligan grease has been used by Indigenous Peoples of the North Pacific coast  for at least 5000 years to treat stomach aches, colds and skin conditions, and as a traditional food source high in omega-3 fatty acids . Analysis of remains have shown that ooligan could comprise up to 67% of traditional historical fisheries catches . Because ooligan spawning relies on the timing of the spring freshet, and because the species has declined in the past 25 years due to fishing pressure and predation, the species may be at risk from combined climate-induced and non-climate drivers  . Projections under RCP2.6 or RCP8.5 estimate reductions by 21 or 31% by 2050 in essential nutrients from traditional seafood for Indigenous Peoples in Canada, relative to 2000, with a modelled nutritional deficit that includes non- traditional dietary substitutions .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report