A containment pen for finfish aquaculture, comprising a supporting structure,a net attached to the supporting structure and defining a containment volumefor containing finfish, wherein the net comprises a plurality of removable netpanels, wherein each of the removable net panels comprises a discrete piece offlexible netting attached along its perimeter to one or more substantiallyrigid members, and wherein the removable net panels are configured to beremovable from the containment pen with the piece of flexible nettingremaining attached to the substantially rigid members.
