NL16 Flush on river, but full house posible

Guys in unknow but looking ant hes stack size he is a fish, playing 1 table.

Do i nead re rais on river or just call ??

P.S Sick luck from that donk

Hand converted with online PokerStrategy.com hand converter:

Play hand

$0.08/$0.16 No-Limit Hold'em (9 handed)

Known players:
[tg]MP2$36.27:///////;MP3$1.52:///////;CO$17.95:///////;BU$16.74:///////;SB (Hero)$43.52:///////;BB$26.58:///////;UTG1$18.53:///////;UTG2$16.95:///////;MP1$9.42:///////;[/tg]

Preflop: Hero is SB with A:d, 7:d.
2 folds, MP1 calls $0.16, 4 folds, Hero calls $0.08, BB checks.

Flop: ($0.48) Q:d, A:c, 3:c (3 players)
Hero checks, BB checks, MP1 checks.

Turn: ($0.48) 3:d (3 players)
Hero bets $0.46, BB folds, MP1 calls $0.46.

River: ($1.4) 6:d (2 players)
Hero bets $1.92, MP1 raises to $3.84, Hero raises to $42.90, MP1 calls $4.96.

Final Pot: $53.1.
Results follow:

Hero shows a flush, ace high(A:d 7:d).
MP1 shows a full-house, sixes full of threes(6:h 6:c).

MP1 wins with a full-house, sixes full of threes(6:h 6:c).