I’m guessing it’s a biology class where the shrimp part of a larger theme. Especially because they had actual shrimp for the students instead of just the movie. It’s like when you’re learning about the body and you get to dissect an animal (I.e pig, frog, shark (they did that in one of my classes)) to learn more about how the body works, adaptation and evolution instead of just learning about pigs for a few weeks.