Scaled fish oil: 1* scaly eel+lead bottle.
Fish oil with stone scales has a wide range of uses, which can be used for:
Super defense agent: 2* stone scale fish oil+1* sun grass+crystal bottle.
Powerful stone shield potion: 3* stone scale fish oil+1* silver mine+crystal bottle.
Titan potion: 10* fish scale oil +30* Grom's blood+1* black lotus+crystal bottle.
Fossil potions: 30* scaly fish oil+10* mountain rat grass+1* black lotus+crystal bottle.
However, the recipes of the above four potions are not learned by the tutor, and you have to spend money to buy or throw them.