50nl FR: 99 vs fishy

Villain 46/5 over 20 hands or so - hes clearly bad.

(his bet sizing isnt bad though)

Trivial??

No-Limit Hold'em, $0.50 BB (8 handed) - Hold'em Manager Converter Tool from FlopTurnRiver.com

BB ($50)
UTG ($47.50)
UTG+1 ($57)
MP1 ($44.10)
MP2 ($31.65)
CO ($93.30)
Hero (Button) ($50)
SB ($59.20)

Preflop: Hero is Button with 9:heart:, 9:club:
1 fold, UTG+1 calls $0.50, MP1 calls $0.50, 2 folds, Hero bets $3.50, 2 folds, UTG+1 calls $3, 1 fold

Flop: ($8.25) 3:club:, 5:club:, 10:spade: (2 players)
UTG+1 bets $3.50, Hero calls $3.50

Turn: ($15.25) 4:diamond: (2 players)
UTG+1 bets $12, Hero calls $12

River: ($39.25) 7:diamond: (2 players)
UTG+1 bets $38 (All-In), Hero calls $31 (All-In)

Total pot: $101.25

vs. someone who's generally not aggressive I think you need some history of him spazzing out with 2nd pair when you show weakness or barreling off with flush draws. Probably folding the turn.

turn looks like a fold vs a passive random fish

agreed that turn is a fold

against this sizing i fold the turn (unless i'm comfortable calling the rest on some rivers). vs 1/2pot or anything smaller i call down all day and all night.

His donk bet is 25% and aggression by street increases on turn and river

Does this make any difference - on the river I have him on a busted fd and nothing a lot and a ten occasionally

that would seem to change a lot.