Bicycles on the ferry from Rijeka to Novalja, Pag

Yes.

No bicycles are allowed as this is a foot passenger catamaran/ ferry that is run by Jadrolinija and the Jadrolinija ferry company at the present does not take any bicycles on its passenger ferries.

Instead, they expect you to travel by your bike packed in the bag or to take alternative car ferry transport.

https://www.croatiaferries.com/rijeka-novalja-ferry.htm

Re prices/cost: on every page at the bottom you can see prices for foot passengers as well as for cars, bikes and other vehicles (if allowed)