So, this is a 6-max tournament with a filed size of about 700. There;s around 100 left and 70 pay.
Only have 12 hands on villain but I could tell he was pretty stationy/fishy (VPIP45/PFR23). In the orbit before this hand I raised from the cut-off and he defended and the flop was pretty much identical (8 high rainbow), where we both checked flop and he took it on the turn, so hopefully that helps a little.

The flop seemed pretty standard. My thought process on the turn was that villain either had a 7 or 8 after the flop donk, so when he donks again I raised because I like to put pressure on players close to the bubble and I have decent equity against a pair, also I felt with this texture having the initiative for the river gave me a better chance on winning the hand.

Now the river, I always have trouble with extreme fish plays like this, I don't think i can just call here with A high he almost always has a weak pair here, I know me representing a 9 doesn't make that much sense in this spot but that min bet was just asking for a raise. Was bluffing correct here and if so was my sizing wrong?

It works vs thinking players - app. he wasnt the type

I don't mind the play since if you do this with stronger hands as well, the opponent will sometimes look really silly calling with a small pair. Not sure what the villain had but if you can find a range where it's incorrect for him to call with a small pair, then just do it all the time, and don't worry about when it backfires.

when he bets 600 into 16k otr, it's a pretty big clue that he might be a better guy to extract value from than to bluff.

Not really, I think you choose the wrong target and spot for doing this. Also, the T is not a good card for you to bluff because a player of this level will perceive this card as a total blank. Same if it would be a J instead.
Also note that the sizing he uses flop/turn are higher than the avg fish donk bet (that indicates a weak range). Basically it's a clear spot where Villain won't give up easily. Plus, you can't apply max pressure on him bc he covers you.

So just another case of "fancy play syndrome"!!!

I get too deep into thought into these spots lol

This

Flat call him OTR just cause it's worth 600 chips to see what he had.

Proceed to make a note on him to value bet the ever living F out of him in the future.

I see that Donkbet play a lot of times, and I guess reraising is very risky against that kind of players. I dont see them folding a lot against such lines, because they often get reraised with their line. Probably its better to reraise on the flop to represent some overpairs aswell, but if u only call u represent only overcards or sth like 44-66, maybe T9..

you broke the cardinal rule in poker if they don't know what they are doing how can you?

Agree with the above comments that these type of 'sticky' players are not the type you want to bluff but instead take to value town all day every day

"Stationary fish" leads out. What does that mean? Why do you think you can bluff him?

Exactly.

I understand and agree what you saying in your first comment, and I've realised this was the wrong player to bluff, but I dont get what your saying with your second statement. You're implying that villain led out to induce a bluff raise, I highly doubt that!!!!

No, I'm implying that the Villian bet river thinking he had the best hand and trying to get "value". So he was always going to "bluff catch" your raise.

Ok haha, makes sense

OTT I'm probably folding to his 2nd donk bet, this board smack's his calling range preflop and as of the turn you just have Ace high. Fold and wait for a better spot imo.