I'm all for not cutting the eyes off of shrimp for no particularly good reason, but I just want to devil's advocate the argument for the complex internal lives of shrimp used here:

Researchers discovered that when shrimps are subjected to ESA, they try to escape it. They also flick their tails and rub their eye area. When the wounds are covered or medicine is given, the shrimps calm down. This suggests that the ablation caused them pain and distress.

Ants seek to escape the heat of the magnifying glass, flies seek to escape the flyswatter, most plants show signs of stress after being damaged and many plants are capable of sensing and learning, and even single-celled slime molds are capable of learning simple behaviours. This is not evidence of complicated sentience, this is something most non-microbial (and some microbial) life on the planet does.

Shrimp are ocean bugs with such a small number of neurons (less than 1 million) that we would probably be capable of simulating them on a present-day computer. As far as animals go, they're pretty far down the sentience ladder. If you've ever killed a cockroach, that was an animal more complicated than most species of shrimp.