Black Sea Bass

I have a black sea bass that i caught in long island sound little over a year ago, i have him living in my girlfriends Saltwater tank 75gal, she afraid that it will eat her favorite goby (which i know will eventually happen) but I'm just curious how much a Black Sea Bass 5-7in would possibly go for if it comes down to getting rid of it can't find anything or anyone online selling them etc. if anyone has any input that might help thank you.