Fish

A fish is a weak player — someone the stronger players at the table expect to win money from. It is table slang rather than a technical term, and it is applied far more confidently than the evidence usually justifies.

Where the word comes from

The metaphor is simply that of being caught. A fish is prey; the skilled players are fishing. The related terms follow the same logic — a "whale" is a wealthy weak player who plays big, and "shark" is the counterpart used for a strong one.

What actually marks a weak player

The recognisable patterns are patterns of too much and too little rather than any single mistake:

- Playing too many hands before the flop, and continuing with them too far afterwards. - Calling far more often than raising or folding, which is why "calling station" overlaps so heavily with "fish". - Bet sizes disconnected from the pot — tiny bets with strong hands, large ones with weak holdings. - Chasing draws regardless of the price offered. - Playing noticeably worse after losing a big pot, which is tilt rather than lack of skill, and temporary.

None of these is visible in a single hand. One loose call proves nothing; a consistent tendency across a session is information.

Why the games depend on them

Poker is played between players, and the house takes rake from every pot. Money therefore has to enter the economy from somewhere, and it enters from recreational players who are losing. A table of nothing but strong regulars is close to unbeatable after rake — everyone's edge against everyone else is small and the house's cut is not. This is why experienced players pay close attention to table selection, and why a room full of good games matters more to a professional's results than most strategic refinements.

It is also why "fish" is a poor word for people the game cannot survive without. Recreational players are paying for entertainment, which is a legitimate thing to buy.

The label is usually premature

The most common error is the reverse of the one the term implies: a player who makes an unfamiliar play is read as weak when they were simply playing differently. Short-term results are especially misleading. A player who has won three big pots looks like a shark and a player who has lost three looks like a fish, when both may be the same standard. Variance is large enough in poker that hundreds of hands are needed before a read on someone's overall standard is worth much.

The practical version of this is worth stating plainly: assuming an opponent is weak is itself a mistake that costs money, because it invites bluffing into players who never fold and value-betting thinly into players who do.

Table talk

Calling someone a fish at the table is poor etiquette and poor strategy. It teaches the opponent that they are being targeted, encourages them to leave, and sours the game for everyone else at it.