It was narrated that Ibn Firasi said:
"I was fishing and I had a vessel with me in which I kept water, and I used seawater for ablution. I mentioned that to the Messenger of Allah and he said: 'Its water is a means of purification, and its dead meat is permissible.'" (DE)
English reference (DE): Vol. 1, Book 1, Hadith 387 (DE)
Arabic reference (DE): Book 1, Hadith 418 (DE)