What is the unique function of the lumpfish's modified pelvic fins?

Answer

They have evolved into a powerful, adhesive sucking disc for anchoring.

The pelvic fins are adapted into a strong sucking disc situated between the pectoral fins, enabling the fish to firmly anchor itself against structures like rocks to resist strong currents.

What is the unique function of the lumpfish's modified pelvic fins?
animalfishcharacteristicLumpfish