When fishing hooks are /killed, they drop fishing loot

I have a lot of command blocks, and they've recently stopped working. One of which being a fishing rod teleport item. When the rod is thrown, it detects the rod from the player, then after a short pause, tp's the player to the rod and kills the rod. But, everytime the rod gets kills, it drops things like Cod, Salmon, Clownfish, ect.