This study examined the operation and management of nucleus scheme in shrimp aquaculture located in Negiri Astinapura covering the period 1999 - Mar 2001. There are four major scheme participants, namely, ACL (Nucleus Company), Coopratives, Plasma and Deptrans. The relationship among participants constitutes a networking in the implementation of a rural development endeavor by adopting the agribusiness in the scheme. The work relationship among participants is revealed in the partnership agreement.