So played against a fish who played 66/22, folded to cbets 15%, betted every turn once i checked to him and then bet big on the river 2 times which i folded both times. This is the second time he bets 160 into 400, first time i raised and he folded, then this spot came up.

Is this a good bluff spot? I figured that he didn't have Kx since I think he would bet bigger, i also hold blockers to the straight. I'm not to happy about a call here since he have shown that he bets small with random 2nd pairs or worse which I should be able to get him off with a big shove in this spot??

Dealt to Hero 6 6

Hero raises to $80, calls $40

FLOP ($160) 5 9 8

checks, Hero checks

TURN ($160) 5 9 8 4

bets $120, Hero calls $120

RIVER ($400) 5 9 8 4 K

bets $160, Hero raises to $770

seriously, don't get creative against those guys. bet the flop, check back turn and give up river imo. as played, don't bluff, he will call you a ton.

He wasn't very call happy on the river but when i had shown weakness he ALWAYS bet turn and river, smaller bets on river with a weakish hand so i really feel i can get him off most of his hands here, but i guess i should of just given up

i don't see any reason to play this hand against fish this way...bet flop, check turn; why you raise him on river? worst hand will never call and 9x and 8x will check you always

Yea, and besides that I think your raise should be a bit smaller here. You risk too much comparing to pot and if he's goin' to fold to your raise he'll do so anyway with smaller raise. Now looks a bit suspicious to me.

NEVER try to bluff a fish. NEVER get creative or play fancy poker, its not profitable.