As salamu ala kum I have read and heard that farm raised tilapia fish from China are fed pig droppings and chicken droppings. Is it still considered Halal , because they are not in the sea and are force fed these droppings?
If it is learned with complete confidence through reliable sources that the all of fish feed contains pig dropping and chicken droppings then it would not be allowed to consume such fish for food.
If it is just a hearsay and there is no reliable research on this issue then the original rule of fish being Halal would apply and it would be permissible to consume that farm fish for food.
And Allah knows best.
Mufti Ikram ul Haq
Fatwa Center of America