Most non-Muslims ask why Muslims eat fish without slaughter and why they slaughter and eat other animals. The answer to this is that the blood in the animal is the habitat of bacteria and other germs. When we slaughter an animal, the relationship between the heart and the brain is not broken. The heart is alive and all the blood in the body In this way the meat is halal and pure. If the animal is killed by shock, then the heart is dead at the same time and all the blood of its body is absorbed in the meat. It is not permissible nor is it halal,
So we eat the meat of slaughtered animals There is no need to slaughter the fish because as soon as the fish comes out of the water, the system of its whole body changes under the special system of Allah. All the blood of its body comes out of its water as soon as it comes out of its mouth. There are clusters that accumulate in them and all the flesh of its body is sterilized so the fish does not need to be slaughtered. Allah has guided us Muslims in the Holy Qur’an about everything. Then there is all the information in the hadith. Science has always been indebted to Islam. The beginning of science is more or less fourteen hundred years ago. He made his holy book in the Holy Qur’an for human beings in which there is no room for doubt.
say: i do not find in that which has been revealed to me anything forbidden for an eater to eat of except that it be what has died of itself, or blood poured forth, or flesh of swine-- for that surely is unclean-- or that which is a transgression, other than (the name of) allah having been invoked on it; but whoever is driven to necessity, not desiring nor exceeding the limit, then surely your lord is forgiving, merciful Chapter:6 verse 145