Shrimps are dirty in a lot of ways. Most of the shrimp sold worldwide are imported from countries like Thailand and Indonesia. They're grown in a type of farm which are actually crowded and filthy pools full of antibiotics, disinfectants and most pesticides used. In fact, they are actually banned in places like the US. These pools are so dense and dirty that many shrimps actually die in it.
Not only that, many prawn farms slice open and cut off the eyes of female shrimps to make them breathe faster as it causes them to develop mature ovaries. This practice called Eye Stalk ablation happens in almost all prawn hatcheries around the world. It has been reported that the eye stalks fully regenerate after a few months. But, scientists agree that they do show traumatized reactions when this treatment is performed.
