I've been searching for chess positions having the maximal number of moves and captures and managed to break some records. 50 captures by white:
lichess.org/editor/3bnKn1/r2pRpRp/1BN2N2/p2QpB2/1ppqbrp1/PPPPPPPP/8/7k_w_-_-
89 captures by both sides: http://en.lichess.org/editor/4K3/p1pppp1p/1BNPQNB1/R2r2Rr/bpnbnqp1/PPP1PPPP/5k2/8w_-_-_0_1
lichess.org/editor/3bnKn1/r2pRpRp/1BN2N2/p2QpB2/1ppqbrp1/PPPPPPPP/8/7k_w_-_-
89 captures by both sides: http://en.lichess.org/editor/4K3/p1pppp1p/1BNPQNB1/R2r2Rr/bpnbnqp1/PPP1PPPP/5k2/8w_-_-_0_1