In the M/V “Louisa” case of 28 May 2013, the International Tribunal for the Law of the Sea held that it had no jurisdiction, even though it had established prima facie jurisdiction at the provisional measures stage. The M/V “Louisa” case thus gives rise to questions regarding the relationship between prima facie jurisdiction and jurisdiction on the merits. Moreover, the M/V “Louisa” Judgment also sheds some light on the applicability of the doctrine of abuse of rights provided in Article 300 of the UN Convention on the Law of the Sea.