How to identify and care for lionhead goldfish<br>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 : [substeps] Lionhead goldfish completely lack a stabilizing dorsal fin. If your fish has a dorsal fin, it is most certainly not a lionhead.
A dorsal fin is not a trait of the lionhead fish
( z1 trait :polarity - :poss ( z2 fish :mod ( z3 lionhead ) ) :domain ( z4 fin :mod ( z5 dorsal ) ) )