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Book cover for Slippery Beast by Ellen Ruppel Shell against a watery background with black text that says "It's going to be hard for me to eat unagi now."
October 5, 2025October 5, 2025

Book Review: Slippery Beast by Ellen Ruppel Shell

You get weird reactions when you tell people you’re reading a book about eels. “…eels?” they’ll say, as if they can’t quite fathom that 1. there are books about eels and 2. there are people, who are not ichthyologists, who want to read about eels.

I suspect that the publisher of Slippery Beast by Ellen Ruppel Shell was also worried that there might not be a lot of people who want to read about eels, because the cover boldly states it’s “a true crime natural history.” People may not want to read about eels, but they sure want to read about true crime!

Let me make one thing abundantly clear: this is not the next The Orchid Thief or The Feather Thief. The true crime portion of this book is so scant that I can’t even tell you the exact details of the crime, because I was thinking a little hard about the craft I was doing while listening to that part of the book, I missed some of it, and they never truly came back to it. There was some sort of raid? On poachers? I think. The problem with audio is I can’t just flip back and refresh my memory.

Throughout the book, people the author spoke to would occasionally make references to poaching, or possible organized crime, or at least violent conflicts between fishers, and it never really comes together as a throughline.

So please go into this book expecting a natural history. You will not be disappointed from that angle! This book really goes into what we do and do not know about eels, specifically freshwater eels, the kind commonly served as unagi.

The thing about freshwater eels is that they actually spawn out in the ocean and then the young swim to freshwater to mature. How wild is that? Even more wild, we still don’t know exactly where they spawn, or how they figure out how to get to and from their spawning grounds.

The other thing about freshwater eels is that wild-caught eel tastes like mud and has a high potential to be contaminated with pollutants, so people catch the baby eels (called elvers) and raise them in captivity, fattening them up on delicious food that in turn makes them delicious to humans. So the book is largely about the attempts to try to figure out how/where eels breed, and whether we can breed them in captivity, and whether it’s really sustainable to eat freshwater eel.

Much like Under the Henfluence has made it difficult for me to eat eggs and chicken, it’s going to be hard for me to eat unagi now.

One reason why I wanted to read Slippery Beast is that I am actually afraid of eels. I have been ever since I was a child, when we went to SeaWorld and they had a brand new moray eel exhibit. The morays sticking out of the rocks, just hanging out there with their mouths agape and their alien eyes made a deep impression on me. The fact that eels also look and move kind of like snakes, which I am afraid of, did not help.

Are these eels the reason why I’ve long had disturbing dreams about dark aquariums full of unseen things that I am instinctively afraid of? I’m sure Freud would have something to say about it. True fact: before Freud become the father of psychoanalysis, he spent some time trying to find eel gonads. No wonder he left biology, it sounded like unpleasant work.

But I digress. I love insects and spiders, and I hate it when people respond “kill it with fire!” to a bug that scares them. I want to show snakes and eels the same respect I would like people to show insects, so earlier this year I read a book about snakes, and now I’ve read a book about eels. I have a great respect for these creatures and the role they play in the ecosystem, even if I still have a gut-deep fear of them.

I think the world would be a better place if we could all show a little more grace towards that which we unreasonably fear.

CWs and TWs: Animal death, vivisection, discussion of eating animals, vague crimey stuff.

Source and Format: I borrowed the audiobook from Seattle Public Library.

Reading Challenge Prompts

Nook & Cranny (Card 2): All About Animals. I’m not sure why it took me so long to fill this box. I read animal books all year! I guess I was just waiting for one I really felt like reviewing. I’m glad to see a book about such an underappreciated critter.

Reading Challenge Progress

Nook & Cranny (Card 1): 18 of 25, 3 bingos.

Nook & Cranny (Card 2): 21 of 25, 4 bingos.

Book Riot: 16 of 24.

Physical TBR: 8 of 12.

World of Whimm: 21 of 24, 6 bingos.

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