Quran Verses5-Surah Al-Maidah ( The Table spread with Food ) 96
Lawful to you is game from the sea and its food as provision for you and the travelers, but forbidden to you is game from the land as long as you are in the state of ihram. And fear Allah to whom you will be gathered.
أُحِلَّ لَكُمْ صَيْدُ الْبَحْرِ وَطَعَامُهُ مَتَاعًا لَّكُمْ وَلِلسَّيَّارَةِ ۖ وَحُرِّمَ عَلَيْكُمْ صَيْدُ الْبَرِّ مَا دُمْتُمْ حُرُمًا ۗ وَاتَّقُوا اللَّهَ الَّذِي إِلَيْهِ تُحْشَرُونَ
Quran's Tafhim ( explanation)
*112). Since one often runs out of provisions during a voyage and is left with no alternative but to catch sea creatures, fishing in the sea has been made lawful.