Re: a 2/4 hand
 

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As for whether this is a turn bet, it could go either way. Will your opponents check-raise? (You say no.) Will they call down with bottom pair? Will they fold the turn with nothing (having bet or called two cold on the flop)? Will they check better hands to you on the river?

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1)opponents check raise 0% and 0.42% after 110 and 550 hands
2,3)fish likely to call down with bottom pair and, given pot size and fact that he bet the flop, TAA could well be calling a turn bet.
4)river aggression of both players is low

I'm thinking that the check was probably right.

By the way, fish had 48o and TAA A6s.