TPTK + 4flush board

[k000k]

Crypto $1/$2, real loose table for crypto, 40%. I must look like a rock to the table, this was probably my 2nd playable hand in a couple orbits, I havent shown down anything yet. BB is fairly fishy - 36%/4%/0.8 after 25 hands.

Hero is CO with A[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/diamond.gif[/img]

Preflop:
4 folds, MP limps, folded to hero who raises, BB calls, MP calls.

Flop (3 players, 6sb) K[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/spade.gif[/img]
bb check, mp check, hero bet, call call.

Turn (3 players, 9sb) K[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/spade.gif[/img]
bb check, mp check, hero bet, fold call.

River (2 players 5.5bb) K[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/spade.gif[/img]
bb bets, Hero ???

I've been 2nd guessing my action all day.

Edit: Let me tack on my thought process: BB seems fishy, if he's on a good run of cards, he's certainly not raising enough.. Fishy players aren't deceptive players, I think this guy's too passive to throw a bet out there without the spade, or at least one of the several straights I see in there.. OTOH, I'm getting 6.5:1...... Do you win when a fish river bets you with this board 15% of the time?