Breitburg et al., 2018). Oxygen availability and the effects of ocean acidification  on zooplankton might become a dominant constraint in the upper ocean's metabolic index, which is projected to decrease globally by 20% by 2100 . In addition, extremely rapid acceleration of climate velocities projected in the mesopelagic under all emissions scenarios suggest that species in this ocean stratum will be even more exposed to future warming than species in the epipelagic . But projections also suggest that warming-related increases in trophic efficiency lead to a 17% increase in the biomass of the deep-scattering layer  by 2100  . Observational studies appear to show that mesopelagic fishes adapted to warm water increased in abundance and distribution in the California Current associated with warming and the expansion of OMZ , suggesting that some mesopelagic fish stocks might be resilient to a changing climate .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report