Vs what seems like a passive fish I dont think that folding ott is a huge misstake. However he will often do this with Ace of spades because he loves making the nut flush and he wants to set his own price to see the river. Im calling turn and any non-spade river lower than 7 if he makes it 1/2 pot or less.

i DONT like call the turn, fold or raise-allin will be my choices.villain's small bet on the turn is really strange,just half pot,if he really has Ace of spades flush draw why not check the turn first? Our preflop range is really strong,most has AA,KK,QQ,JJ,AK in hand,but villain can still bet on the turn.....

and also dont play over pair too hard with passive fish, just be careful. 

fish can have all sort of stuff here on the turn...from 10x no spades to KQ/KJ with one spade,88...+nutted stuff

 in case he has 9x u still have outs

if u reise hes gonna come along with everything that beats u most of the time

just call

on the river i'd fold on spades since he wont bluff those much and Q/K/As are in his turn bluffing range and since u block QJ he wont have many bluff on a spade river to shove

on a low non spade river i would call since we have the Js that block some flush combos