A5s vs a fishy raiser

[winky51]

Party Poker 3/6 Hold'em
Converted w/ PonksSaver: http://www.pokermentor.net/forum/viewtopic.php?t=510
- - - HAND 3089238163 - - -
PreFlop: <font color="blue">HERO</font> is MP2 with <font color="black">5[img]/images/graemlins/spade.gif[/img]</font> <font color="black">A[img]/images/graemlins/spade.gif[/img]</font> (9 Players)
UTG calls, 2 <font color="darkred">folds</font>, 1 <font color="darkred">fold</font>, <font color="blue">HERO</font> calls, 1 <font color="darkred">fold</font>, Button calls, 1 <font color="darkred">fold</font>, BB checks,

Flop: (4.33 SB) <font color="red">4[img]/images/graemlins/heart.gif[/img]</font> <font color="green">A[img]/images/graemlins/club.gif[/img]</font> <font color="green">K[img]/images/graemlins/club.gif[/img]</font> (4 Players)
BB checks, UTG checks, <font color="blue">HERO</font> <font color="green">bets</font>, Button <font color="darkgreen">raises</font>, BB <font color="darkred">folds</font>, UTG <font color="darkred">folds</font>, <font color="blue">HERO</font> calls,

Turn: (4.17 BB) <font color="black">J[img]/images/graemlins/spade.gif[/img]</font> (2 Players)
<font color="blue">HERO</font> <font color="green">bets</font>, Button calls,

River: (6.17 BB) <font color="green">2[img]/images/graemlins/club.gif[/img]</font> (2 Players)
<font color="blue">HERO</font> checks, Button <font color="green">bets</font>, <font color="blue">HERO</font> calls,

Final Pot: 8.17 BB

Hands like this don't make me feel right. He could have so many things including an ace with a weaker kicker or a draw. Player is a fish pure and simple. Doesnt raise with anything other than AA, KK, QQ, AK preflop.

When you are in a situation with a hand like A5s right in the middle whats the best play. Raise preflop to get it HU or limp encourging others knowing only a better hand is raising behind so you can make your flop decision easy.

If I was MP3, CO, BUT I'd raise vs EP figuring I'm ahead.