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The once-insulated deep-sea marine environments now experience major transformations because of climate change even though they were believed to remain stable against surface changes. The benthopelagic fish group known as deep-sea grenadiers dispersed throughout abyssal and bathyal areas belong to the family Macrouridae which functions as essential indicators of ecological transformations in these distant locations. The research evaluates how climate change affects grenadiers by combining oceanographic information with historical trawl data and computer predictions of population change.Research results show that increasing ocean temperatures together with shifts in thermohaline circulation patterns affect seafood resources and oxygen minimum zones (OMZs) which causes some grenadier species to redistribute their depth ranges while their distribution areas either expand or shrink. The upward depth movements of population groups due to ocean warming reveal them to intensified predator attacks as well as reorganized food networks. Marine snow and detritus flux declines have resulted in decreased grenadier population survival rates through their detrimental influence on both sizes of individuals and their reproductive fitness along with their juvenile survival rates.Scientific investigations note that Coryphaenoides armatus represents one of the most studied grenadiers while showing major population declines along with decreasing particulate organic carbon (POC) flux in the eastern North Pacific region. Studies indicate that the population of Coryphaenoides yaquinae displays stronger resistance to environmental pressure compared to other abyssal fish species. Grenadiers play dual roles as predators and prey within deep-sea ecosystems which allows their population change to affect deep-sea biodiversity while affecting processes of carbon cycling and nutrient dynamics.