عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنْ صَالِحِ بْنِ السِّنْدِيِّ عَنْ يُونُسَ قَالَ كَتَبْتُ إِلَى الرِّضَا ( عليه السلام ) السَّمَكُ لَا يَكُونُ لَهُ قِشْرٌ أَ يُؤْكَلُ فَقَالَ إِنَّ مِنَ السَّمَكِ مَا يَكُونُ لَهُ زَعَارَّةٌ فَيَحْتَكُّ بِكُلِّ شَيْ‏ءٍ فَتَذْهَبُ قُشُورُهُ وَ لَكِنْ إِذَا اخْتَلَفَ طَرَفَاهُ يَعْنِي ذَنَبَهُ وَ رَأْسَهُ فَكُلْهُ .
13. Ali ibn Ibrahim has narrated from his father from Salih al-Sindiy from Yunus who has said the following: “I once wrote to abu al-Hassan, al-Rida’ , and asked if fish which has no scales can be used for food. He (the Imam) said, ‘Of fish there are those which have bad manners and they rub against everything and its scales go away, but if its two ends are different, its tail and head, then you can use it for food.’” 