The main thing I'm feeling about this book is one of confusion. I don't think I understood 20% of what was being said, or trying to be said, or trying to be done.... I just don't know. After finishing the book, I got the main gist of it, but I'm still somewhat baffled when I try to think about the "why's" of the plot's detail. It almost felt like I was reading the second book of a series as we are plunked down with the main character Lori, who is already hunting feeders, in a world where the waters have risen but it's not the distant future (that bit is pretty much, sorta-kinda, explained by the end), but boy was I floundering for most of the book to make sense of a lot of it. Also the dialogue got kinda run-on-ish. They're all teens and I think the author was doing his best to make the dialogue sound young and "hip"? Maybe?
So, if you're looking for a sci-fi book with a good dash of horror, and mutant teens, and dimensional travel and lots of fish knowledge, have I got a book for you!
Maybe.

Edit: Oh! Oh! I do want to give this book a big kudos for it's diverse characters! It did a great job!