Entry 1 sense Webster, 1913 Sea perch /sē pẽrch/ · Sea· perch · IPA /ˈsiːpɜːtʃ/ 01 The European bass (Roccus lupus syn. Labrax lupus); -- called also sea dace. 1. The European bass (Roccus lupus syn. Labrax lupus); -- called also sea dace.(Zool.) Also: sea dace