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How to identify and care for lionhead goldfish 
Check the fish you are preparing to buy, or if it is already in your tank, observe it. 
Lionhead goldfish have the following as physical traits : 
Lionhead goldfish completely lack a stabilizing dorsal fin. If your fish has a dorsal fin, it is most certainly not a lionhead.
Lionhead goldfish are round and " fat " relative to other goldfish. Lionhead goldfish grow a fleshy " growth " on the top of their head.