The Prophet ﷺ said: What the sea throws up and is left by the tide you may eat, but what dies in the sea and floats you must not eat. Abu Dawud said: This tradition has been transmitted by Sufyan al-Thawri, Ayyub and Hammad from Abu al-Zubair as the statement of Jabor himself (and not from the Prophet). It has been also transmitted direct from the Prophet ﷺ through a weak chain by Abu Dhi'b, from Abu al-Zubair on the authority if Jabir from the Prophet ﷺ.  

قَالَ رَسُولُ اللَّهِ ﷺ مَا أَلْقَى الْبَحْرُ أَوْ جَزَرَ عَنْهُ فَكُلُوهُ وَمَا مَاتَ فِيهِ وَطَفَا فَلاَ تَأْكُلُوهُ  

“Whatever the sea throws out or is left behind when the tide ebbs, eat it, but whatever rises to its surface, do not eat it.’”  

قَالَ رَسُولُ اللَّهِ ﷺ مَا أَلْقَى الْبَحْرُ أَوْ جَزَرَ عَنْهُ فَكُلُوهُ وَمَا مَاتَ فِيهِ فَطَفَا فَلاَ تَأْكُلُوهُ