Vs fish, no reads. It was Sunday evening and games were more crazy than normally.
Has anyone called down in this kind of spot? What did they have?
His river shove is a slight overbet, ~70€ into 60€ pot.

Microgaming - €1 NL (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

Hero (CO): 100 BB
BTN: 107.27 BB (VPIP: 35.81, PFR: 22.30, 3Bet Preflop: 5.17, Hands: 154)
SB: 152.48 BB (VPIP: 28.57, PFR: 17.86, 3Bet Preflop: 12.12, Hands: 85)
BB: 100 BB
UTG: 118.31 BB (VPIP: 60.00, PFR: 26.67, 3Bet Preflop: 37.50, Hands: 15)
MP: 166.29 BB (VPIP: 26.67, PFR: 17.78, 3Bet Preflop: 6.25, Hands: 46)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has K K

UTG raises to 2 BB, fold, Hero raises to 8.5 BB, fold, fold, fold, UTG calls 6.5 BB

Flop: (18.5 BB, 2 players) 8 5 A
UTG checks, Hero checks

Turn: (18.5 BB, 2 players) A
UTG bets 20.93 BB, Hero calls 20.93 BB

River: (60.36 BB, 2 players) 3
UTG bets 88.88 BB and is all-in, fold

I mean I would make my decision OTT.....

Easy fold.
Villain's Ax combos is unlimited..

You also block KdXd

This, if games were more spewy than usually, fish will follow up even more with a river bet here probably more than 66%. And they'll rarely bet less than pot.
In more tight games, you might find a lot more give ups" one-stabs" so call/fold works allright assuming you check back some Ax.

I'd play the same as you, i'd never fold turn in game and i know it. Then i would fold river lol.

I think this is well played. This kind of fish probably opens any ace from any position and probably calls any 3b with them. Sure, it's a paired board and this guy seems quite aggro but I don't think that's a solid enough read.

Also, slight overbets are much stronger than psb in my opinion (especially on the turn here).

I think i'd play the same. Seen lots of fish pot once as a bluff then give up.

Wp IMO

As in you would call this river if you called the turn?

Fold turn imo.

Bet really small on flop and turn - probably playing Ax like that anyway except I'm not tripling river w/KK obv

I agree with all the comments. 15 hands is a very small sample, almost a vacuum. I'd probably fold that turn when he bets that big, overbets even, that indicates at least in my world that he probably won't give up on the river.

general it's like fold turn when he bets is ok, because all we have is a bluff catcher and we don't know enough of his range. call turn - call river is ok, because I guy with 60VPIP must be bluffing very much to balance up that high VPIP