'Zolotaya' -> made of gold or golden, 'Rybka' -> fish.

The Polish currency is named 'złoty', which also has its roots in gold.

Yeah but it's more than that. It's not just "golden fishy", it's also a ubiquitous (in Russia) Russian fable, as the parent comment mentioned.

'Rybka' is the diminutive of fish - 'Ryba'

To nie ja, to rybka!