fish are relative.
I'm a fish at 200nl+, any stakes omaha or stud, anytime I'm deeper than 300bb, etc.
a wannabe at 50nl and 100nl (i.e. slowly becoming less of a fish)
perhaps close to solid at micro-micro stakes.

If a fish is someone who can be exploited, then most of us are fish...
so if you are inside the game of a player, that turns them into a fish against you - even if they are a solid player in the context of their stake/game.

thoughts on how to really play the player to exploit?

http://www.flopturnriver.com/phpBB2/...ts-t75167.html

some standard leaks that turn someone into a fish:
* most important - bad bankroll management
and others:
* 3-bet loads, fold to 4-bets too often
* no blind defence
* defends blinds by calling
* limited range variation by position
* poor pot-odds play with draws
* pays out when draws hit too much
* doesn't 3-bet enough
* slow plays too much
* level 1
* thinking that opp's entire stack is available to justify calls with "implied odds"
* not varying play by opponents
* not understanding effective stack sizes (when you're 200bb deep and villain has 60bb - then realise you're no longer 200deep in that hand!)
* lack of pot-size/bet-size manipulation
* respond to difficult situations by folding = most multi-tabling regs
* wannabe lags who get all 20-17 preflop but don't understand post-flop
and the list goes on
......
i think that any of the leaks described here or by others is worthy of a whole thread. Playing the player is probably the best place for it...