oceanic pelagic zone biome oceanic benthopelagic zone biome 2010-03-15T11:21:03Z ENVO ENVO:01000040 ORCID:0000-0002-4366-3088 The benthopelagic zone biome comprises regions of the marine water column which usually coincide with the benthic boundary layer (BBL) - the layer of isothermal and isohaline water contiguous to the sea floor. A general reversal in the declining gradient of pelagic biomass may be observed here, perhaps explained by viable nutrition on the sea floor being resuspended by bottom currents. This zone typically extends 100 m above the seafloor, but may reach upto1000 m during benthic storms.