In horizontal cells (HCs) that were freshly dissociated from goldfish retina, two types of voltage- dependent calcium currents (ICa) were recorded using a patch-clamping configuration: a transient type current and a sustained type current. The cell was held at ⁣40 mV, and the prepulse step of ⁣90 mV was applied before command pulse between ⁣65 and ⁢55 mV. The transient Ca2⁢ current was activated by depolarization to around ⁣50 mV from a prepulse voltage of ⁣90 mV lasting at least 400 ms and reached a maximal value near ⁣25 mV. On the other hand, the sustained Ca2⁢ current was induced by pre-inactivation for less than 10 ms duration. Its activation started near ⁣10 mV and peaked at ⁢20 mV. Co2⁢ (2 mM) suppressed both of these two components, but nifedipine (20μM), L-type Ca2⁢ channel antagonist, blocked only the sustained current. Based on the activation voltage and the pharmacological specificity, the sustained current appears to be similar to L-type ICa and the transient type to T-type ICa. This study is the first to confirm that transient type ICa together with the sustained one is present in HCs dissociated from goldfish retina.