Seamounts are submarine reliefs emerging from the deep-sea floor assumed to be oases of biological productivity , usually characterized by hard substrata, low sedimentation rates and high surface productivity.  Due to fish concentrations seamounts are targeted by commercial fishing, and interest is growing for mining of polymetallic often found on these structures. Dominated by filter-feeders invertebrates, mainly corals and sponges, benthic communities seems to show higher biomasses than on adjacent slopes, require higher nutritional inputs from surface waters. However, very few data have been acquired so far on particulate fluxes reaching the bottom, neither on hydrodynamic conditions.  After qualitative and quantitative assessment of benthic communities of several seamounts by using the ROV Victor, we will deploy long term mooring equipped by current-meters, CTD, optodes and sequential particule traps  on two of them explored during the KANADEEP2 cruise (septembre 2019). The seamounts, localised along the Norfolk and Félicité ridges south of New-Caledonia have been already sampled by previous cruises and contrast by their benthic fauna composition, either dominated by sponges or corals. The objective of the KANADEEP-Récup cruise is to recover the mooring one year after their deployment , in order to characterize (1) benthic current dynamics (speed and direction), (2) water masses characteristics (temperature, salinity, oxygen), (3) assess particule flux and organic and inorganic material quality reaching the seafloor, (4) larvae or other propagules captured by the traps close to the benthic assemblages. These data will complete the environmental dataset acquired during the Kanadeep ROV cruise, necessary to understand benthic community variability on seamounts and will contribute to assess the stepping stone role of these isolated reliefs in the regional distribution of the benthic fauna. The mooring recovery being few time consuming, we plan a few dredges  on each seamount, in order to complement fauna sampling already done during Kanadeep ROV dives and  by previous dredge sampling.