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What a Fish Knows by Jonathan Balcombe Review: A Myth-Busting Deep Dive into Fish Intelligence
Jonathan Balcombe's New York Times bestseller dismantles centuries of assumptions about fish, drawing on current ethology and biology to reveal more than thirty thousand species of fishes as sentient, social, and cognitively sophisticated creatures — a genuinely revelatory work of popular science published by Scientific American / Farrar, Straus and Giroux.
LuvemBooks Verdict
Best for
Readers curious about animal cognition and environmental ethics — especially aquarium keepers, divers, or anyone who has ever wondered what actually goes on inside a fish's mind — who want rigorous science delivered with narrative drive.
Worth it if
You're willing to engage with a chapter-by-chapter cumulative argument and are open to having long-held assumptions about fish intelligence, feeling, and social life systematically overturned.
Skip if
You want a dispassionate survey of competing scientific viewpoints — Balcombe writes as a clear advocate for fish sentience and welfare, leaving limited room for dissenting research.
What readers & critics say
Publishers Weekly praised Balcombe for drawing "deeply from scientific studies" with "the vivacious energy of a cracking good storyteller," presenting fishes as sentient creatures with full cognitive and social lives. Literary Review called it "as cogent, salutary and substantial a study of piscine behaviour" as one could hope for — impressive in its scientific grounding and wearing its learning lightly, while Project MUSE noted the book calls readers urgently to reevaluate their attitudes not just toward fishes but toward all things different from ourselves.
“With the vivacious energy of a cracking good storyteller, Balcombe draws deeply from scientific studies to introduce readers to fishes as sentient creatures that live full lives.”
— Publishers Weekly4.6from 863 Amazon ratings— reader ratings, not a LuvemBooks score
In This Review
- What Works & What Doesn't
- What the Book Actually Argues
- Scope and Scientific Grounding
- Storytelling and Accessibility
- Where Readers May Push Back
- Who This Book Is For
What Works & What Doesn't
What Works
- A New York Times bestseller grounded in current ethology, with a full bibliography covering dozens of species and global research
- Praised by critical coverage and Literary Review for combining rigorous scientific sourcing with vivid, story-driven prose
- Covers an extraordinary range — more than thirty thousand fish species across habitats from tide pools to the deep ocean
- Structured chapter-by-chapter through distinct dimensions (perception, feeling, cognition, social life, reproduction) for a cumulative, evidence-built argument
- Extends beyond science into environmental ethics, making a case for reconsidering humanity's relationship with marine life
What Doesn't
- Balcombe writes as an advocate for fish sentience and welfare — readers seeking a neutral survey of competing scientific viewpoints may find the book's thesis-driven approach leaves less room for dissenting research
- The deliberate use of 'fishes' as a plural (rather than 'fish') is scientifically grounded but a noticeable stylistic choice that some readers find distracting
What a Fish Knows is a work of popular science that delivers far more than its deceptively simple title promises — and its New York Times bestseller status reflects a broad audience ready to have its assumptions overturned.
What the Book Actually Argues
What a Fish Knows: The Inner Lives of Our Underwater Cousins by Jonathan Balcombe front cover
At its core, What a Fish Knows is a systematic challenge to the idea that fishes are, as Balcombe puts it, unfeeling, dead-eyed feeding machines. The book is structured around a series of pointed questions — Do fishes think? Do they really have three-second memories? Can they recognize the humans peering down at them from above the water's surface? — and works methodically through the science behind each one. Balcombe, an ethologist, organizes the book into chapters that move through perception, feeling, cognition, social bonds, reproduction, and what happens when fish are removed from their environments. The titles alone — "What a Fish Perceives," "What a Fish Feels," "What a Fish Thinks," "Who a Fish Knows," "How a Fish Breeds," "Fish Out of Water" — telegraph an argument built chapter by chapter rather than delivered all at once. By the end, Balcombe's case is that fishes are sentient, aware, and Machiavellian in their social lives: creatures that plan, hunt cooperatively, use tools, curry favor, deceive one another, and punish wrongdoers.
Scope and Scientific Grounding
One of the book's genuine strengths is the sheer breadth of the animal kingdom it covers. With more than thirty thousand species of fish in existence — outnumbering all mammals, birds, reptiles, and amphibians combined — the diversity on display is staggering, and Balcombe draws on breakthrough discoveries from researchers and fish enthusiasts worldwide. The book covers habitats ranging from shallow tide pools to the deepest ocean reaches, and it brings the latest findings in animal behavior and biology to bear on questions that most popular science has left unexplored. The Archive.org library record confirms the book includes a full bibliography (spanning pages 239–270) and an index, signaling the scholarly apparatus behind the accessible prose. Critics described Balcombe as drawing "deeply from scientific studies" to "make a convincing case that fish possess minds and memories, are capable of planning and organizing, and cooperate with one another in webs of social relationships."
Storytelling and Accessibility
The book's reception points consistently to Balcombe's ability to translate dense research into compelling narrative. David Profumo, writing in Literary Review, praised what he called "the vivacious energy of a cracking good storyteller," and critics characterized the result as a "sparkling exposition." The publisher positions the book as revealing a truth "far richer and more complex, worthy of the grandest social novel" — a deliberate rhetorical choice that signals Balcombe's intent to give fishes the kind of individual, social drama readers associate with literary fiction. The book's range of behaviors — elaborate courtship rituals, lifelong bonds between shoalmates, cooperative hunting strategies — gives this storytelling ambition real material to work with. A source from Project MUSE noted that Balcombe's account "calls us urgently to reevaluate our attitude — not just to fishes, but to all things that are different from ourselves," pointing to a moral and philosophical dimension that runs beneath the science.
Where Readers May Push Back
Balcombe writes from a clear perspective: fishes deserve moral consideration, and humanity's treatment of them demands rethinking. That advocacy is transparent and argued through evidence, but readers looking for a dispassionate survey of competing scientific viewpoints may find the book more committed to its thesis than to entertaining serious counterarguments. Balcombe also makes the deliberate stylistic choice to use "fishes" rather than "fish" as a plural — a grammatically valid but noticeable decision that some readers find distracting, though it is consistent with biological convention for referring to multiple species. The book's argumentative momentum is an asset for engaged readers; those who prefer more equivocal scientific writing may occasionally want more space given to dissenting research.
Who This Book Is For
What a Fish Knows earns its place on the shelf of anyone curious about animal cognition, environmental ethics, or the hidden complexity of marine life. It speaks directly to readers who keep an aquarium at home — the publisher singles out "the pet goldfish included" — as well as to those interested in the broader field of animal behavior and the ethics of how humans interact with wild and farmed fish populations. As popular science, it functions both as an introduction to a neglected corner of ethology and as a call to action regarding what Balcombe describes as the planet's increasingly imperiled marine life. The New York Times bestseller recognition confirms it found an audience well beyond specialist readers, and the depth of its chapter-by-chapter structure rewards those willing to engage with the full argument rather than sampling it selectively.
Frequently Asked Questions
is What a Fish Knows: The Inner Lives of Our Underwater Cousins by Jonathan Balcombe worth reading
It's worth reading if you're curious about animal cognition, environmental ethics, or the hidden complexity of marine life — the review notes it earns its place on any of those shelves. Its New York Times bestseller status confirms it found an audience well beyond specialist readers, and the chapter-by-chapter structure ("What a Fish Perceives," "What a Fish Feels," "What a Fish Thinks," and more) rewards those who engage with the full argument. The main caveat: readers wanting a dispassionate survey of competing viewpoints may find Balcombe more committed to his thesis than to entertaining serious counterarguments.
what is What a Fish Knows: The Inner Lives of Our Underwater Cousins by Jonathan Balcombe actually about
It's a systematic challenge to the idea that fishes are, as Balcombe puts it, "unfeeling, dead-eyed feeding machines," drawing on current ethology and biology to argue they are sentient, social, and cognitively sophisticated. Balcombe works through questions like whether fishes really have three-second memories, whether they can recognize humans peering at them from above the water's surface, and how they plan, hunt cooperatively, use tools, and even punish wrongdoers in their social lives. The book covers more than thirty thousand species across habitats ranging from shallow tide pools to the deepest ocean reaches.
does What a Fish Knows: The Inner Lives of Our Underwater Cousins by Jonathan Balcombe have an agenda or is it neutral science
Balcombe writes from a clear perspective — fishes deserve moral consideration, and humanity's treatment of them demands rethinking — so it is not a neutral survey. The review notes that advocacy is transparent and argued through evidence, but those who prefer more equivocal scientific writing may occasionally want more space given to dissenting research. A source from Project MUSE described the book as calling readers "urgently to reevaluate our attitude — not just to fishes, but to all things that are different from ourselves," which signals the moral and philosophical dimension running beneath the science.
is What a Fish Knows: The Inner Lives of Our Underwater Cousins by Jonathan Balcombe good for people who keep aquariums or pet fish
Yes — the publisher specifically singles out aquarium keepers, noting "the pet goldfish included" as part of the intended audience. The book directly addresses questions that fish owners often wonder about, like whether their fish can recognize them, backed by Balcombe's deep draw from scientific studies. It functions both as an introduction to a neglected corner of ethology and as a call to rethink how humans interact with fish in domestic and farmed settings.
how readable is What a Fish Knows: The Inner Lives of Our Underwater Cousins by Jonathan Balcombe — is it too dense or scientific
The review points consistently to Balcombe's ability to translate dense research into compelling narrative — David Profumo in Literary Review praised "the vivacious energy of a cracking good storyteller," and critics called it a "sparkling exposition." It's written for a general adult audience, not specialists, and the publisher deliberately frames the fish behaviors as material worthy of "the grandest social novel." The book does include a full bibliography spanning pages 239–270, so the scholarly apparatus is there, but it sits beneath accessible prose rather than interrupting it.
does What a Fish Knows: The Inner Lives of Our Underwater Cousins by Jonathan Balcombe get into fish behavior and social lives or is it just biology basics
It goes well beyond basics — Balcombe details elaborate courtship rituals, lifelong bonds between shoalmates, cooperative hunting strategies, and what he describes as Machiavellian social lives involving deception, currying favor, and punishing wrongdoers. Critics noted he makes a convincing case that fish are "capable of planning and organizing" and "cooperate with one another in webs of social relationships." The breadth is staggering given that fishes outnumber all mammals, birds, reptiles, and amphibians combined.
is What a Fish Knows: The Inner Lives of Our Underwater Cousins by Jonathan Balcombe similar to other animal cognition books
The review positions it as filling a genuine gap — most popular science has left the inner lives of fishes largely unexplored, so it occupies a relatively uncrowded space in the animal cognition genre. Like other works in that field it draws heavily on ethology and behavioral research, but its specific moral argument (that fishes deserve rethinking in the context of farmed and wild fish populations) gives it an environmental ethics dimension as well. If you enjoy books that combine rigorous science with a clear advocacy perspective on how humans treat animals, this fits squarely in that tradition.
Sources & Further Reading
The key facts and claims in this review are grounded in the retrieved, verified sources listed below.
- Cited in this review
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- Further reading
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Jonathan Balcombe, Wikipedia
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us.macmillan.com
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