Some recently discovered bacteria in the Pacific Gyre may have the slowest metabolism of any creature on earth. Almost no nutrients reach the seafloor where these bacteria live. Nutrients just don’t make it to the seafloor without having been gobbled up by something else or dissolved altogether. So they basically survive on barely nothing and have been doing so for millions of years.
Read more about these barely living bacteria hereslowest living bacteria-slowest metabolism-which fish has the slowest mentabolism-