It was narrated from Jabir that:The Prophet was asked about seawater, and he said: "Its water is a means of purification, and its dead meat is permissible." (Hasan) Another chain with similar wording
Hadith No. 388
Sunan Ibn Majah
Gradings:
Al-Albani:
Hasan Sahih
Muhammad Fouad Abd al-Baqi:
Hasan Sahih
Shuaib Al Arnaut:
Hasan
Zubair Ali Zai:
Isnaad Hasan