Research on design considerations and estimation of forces of fish aggregating device was carried out in Pandeglang water’s Banten Province.  The main construction of fish aggregating de-vice consists of pontoon, wire, main line, attractor (coconut leaf), and sinker (main, bet-ween,attractant).  Total buoyancy force is estimated 2.743.896,59 gs, and total sinking force is 1.006.888,74 gs thefore the extra buoyancy force is 63.30%.  The buoyancy and sinking forces are smaller than breaking strength main line (6.500.000 gs), the main line still resistance in maximum condition of buoyancy and sinking force.Key word: buoyancy force, fish aggregating device, sinking force
                        
                        
                        
                        
                            
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