Tilapia is considered to be one of the most unhealthy fishes that one can consume. The foremost reason being the circumstances of raising the fish, which is often in an enclosed area. Moreover, the fish also has a reputation of being a food item through which humans can get mercury poisoning. Even though tilapia originated in the Middle East and Africa, the fish is now farmed and available all over the world. Compared to it, the rainbow trout is considered to be one of the healthiest fishes for human consumption.