I'm afraid I can't help with your fish, but it's about time somebody said "Welcome" to you, so;

Welcome to the gmb!
Once you have an id, you can go to that well known internet auction site and do a search of completed and sold listings, using the id. That might give you a ball-park figure for a value.
We don't really tend to discuss values. In the secondary market, something is only worth what somebody is willing to pay for it, in that place and at that time.