We present results from calculations of different quark number and hadronic susceptibilities
on 2+1-flavor dynamical domain wall ensembles. We find that the iso-spin and electric
charge susceptibilities are especially well suited to determine the transition temperature,
as these quantities show only small statistical errors. Moreover, the transition values
of the coupling obtained from iso-spin and electrical charge susceptibilities are
in good agreement with the one obtained from the chiral condensate.