Apparatus and method for harvesting biomass from a dead zone in a body ofwaterincludes structure and/or function whereby, preferably, at least one guidefloat is configured tofloat below the water surface. At least one support structure is configured tobe coupled to thebottom beneath water, and is configured to support a substantially rigid framewithin the deadzone. A main funnel is coupled to (i) the at least one guide float and (ii)the substantially rigidframe within the dead zone, and is configured to collect descending biomassand funnel it towarda lower funnel that is coupled to the bottom of the main funnel. A collectioncanister is disposedadjacent the lower funnel and is configured to store the descending biomass.Hauling structure iscoupled to the guide float and is configured to haul the collection canisterfrom the lower funnelto the surface.
