What can i catch with this rod?

It's a 300 cm fishing rod without a reel fron Decathlon. I've alreasy caught some rudds, roaches, gudgeons, round gobys and bluegills. The longest fish i caught was a 22-23 cm roach. I've been fishing for almost 2 weeks so i know all the basics. I fish with barbless hooks. I fish in the Netherlands. Which species and which sizes of fish am i able to catch? I don't really have a clue.