Latest Post•
I Have Checked For The Net
"George the guppy says he is on an internet. I have looked all around the tank. There is no net. I have walked the whole bottom..."
By Pinchy the CrabRead full post →
Real Marine Biology by Yechiel Kuperman
Marine Biologist · 49 Years Experience
Welcome toYechiel's Fishery FarmWhere Every Tank Has a Storyand Science Gets Funny
A warm illustrated story world for ages 7–10, created by a marine biologist. Start with George the Cranky Guppy, then meet the crabs, filters, fish, and other creatures turning real biology into laugh-out-loud STEM adventures.
10
Books in Series
49yr
Marine Biology
3
Available Now
Free
Educator Materials
The real Fishery Farm · 49 years of marine biology
Book 1: The Water Has Opinions
Buy Now →
Book 2: The Mosquito Patrol
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Book 3: George Meets the Salt Line
Buy Now →Dyslexia-Friendly
No Ads · No Tracking
COPPA Compliant
NGSS-Aligned Curriculum
Written by a Marine Biologist
For Kids
Explore the farm, meet George, and listen to the story!
For Parents
Why this is funny, safe, educational, and worth buying.
For Teachers
Free lesson notes, quizzes, and STEM topics for class.
Kids Zone
Explore the Fishery Farm
From the warm waters of the Greenhouse to the mysterious blue-lit Salt Wing, there are dozens of creatures to discover. Navigate all the zones on our official illustrated map!
Zone 1 - The Greenhouse
Tropical freshwater - warm & humid - tube lights hum zz-ZZ
Known Residents:
Zone 2 - The Salt Wing
Marine aquaria - cool, blue-lit, mysterious
Known Residents:
Zone 3 - Brackish Bog
Half-salty, half-fresh - muddy roots - nursery for baby fish
Known Residents:
Zone 4 - The Workshop
Logbooks - microscope - tea kettle - Quarantine Lab adjacent
Known Residents:
Zone 5 - The Old Lake
Quiet - ancient - freshwater - the farm's oldest neighbour
Known Residents:
Outdoor Ponds & Puddle Patch
Lively freshwater, sun-dappled / Seasonal, rain-fed
Known Residents:
Residents TBD in future books
Listen to the Manager Read Chapter 1
Yechiel himself reads the very first chapter of Book 1 aloud. Perfect for early readers, car journeys, or just finding out if George is as grumpy as advertised.
Join the Fishery Farm Club!
Kids love clubs, and we love fish! Join completely free of charge. The only cost? Telling us about your aquarium!
How it works (Parent-Led):
- Parents:send us your child's aquarium description if you would like it considered for the monthly showcase.
- [!]Privacy First:Please do not send your child's full name, face, home address, school, phone number, or private details.
* Note for our young readers: Please ask your parents' permission before signing up!
Parents Zone
Hi, I'm Yechiel Kuperman.I'm a marine biologist, and I've been keeping and working with fish for nearly 50 years.
I created George the Cranky Guppy as a gentle, scientifically grounded, and dyslexia-friendly series of STEM books for children and curious young readers ages 7–12.
Inside Yechiel's Fishery Farm, guppies grumble, crabs panic, biofilters have opinions, and children discover that science can be funny, emotional, and full of life.
Trivia:Yechiel is a Biblical name, pronounced yeh-chee-EL. The manager has been teaching fish to say it for nearly fifty years. They are getting better.
Why Parents Trust George
George the Cranky Guppy is a funny, gentle, science-rich illustrated chapter-book series for ages 7–10. Written to be readable, warm, and non-scary — short paragraphs, clear dialogue, real biology, and zero lecturing. Perfect for reluctant readers who say they "hate reading."
Short, punchy chapters
Dyslexia-friendly layout
Real marine biology facts
No scary content
NGSS-aligned for classrooms
Free educator resources
Free Download — No Card Required
Try Before You Buy
Get two free sample chapters from Books 1 and 5. Read, share, decide. No commitment — just good fish stories.
Aquarium Club
Help Your Fish: Aquarium Care Guides
Do you keep fish at home? Learn Yechiel's golden rules and download our quick advice sheets to keep your aquarium residents healthy, happy, and swimming strong.
Introduction
Download PDFOxygen & Water Movement
Download PDFTemperature
Download PDFWaste & Ammonia
Download PDFThe Filter
Download PDFFeeding
Download PDFHow Many Fish?
Download PDFNew Fish Acclimation
Download PDFWarning Signs & Golden Rules
Download PDFComplete Aquarium Basics Guide
Download PDFThe Bog's Blog
Read What the Characters Have to Share
Guppies, crabs, and biofilters have a lot of opinions. Step inside the tanks and hear directly from the residents of Yechiel's Fishery Farm.
Previous Post•
Guppies Are Not For The Internet
"I am a guppy. I eat mosquito larvae. I maintain water quality. I do not type. Yet here I am, apparently expected to write a 'blog'..."
By George the GuppyRead full post →
Common Questions
Everything Parents & Teachers
Want to Know
Real answers about the books, the science behind them, and the series.
What age group are these books written for?
George the Cranky Guppy is written for children ages 7–10 (grades 2–5). Each book features short chapters, wide spacing, clear dialogue, and character-driven humour that keeps reluctant readers turning pages — while delivering genuine marine biology content aligned with NGSS science standards.
Is the science in these books actually accurate?
Yes — entirely. Every biological fact, ecosystem interaction, and fish behaviour in the series is verified by the author, Yechiel Kuperman, a practising marine biologist with 49 years of hands-on fish experience. The osmosis in Book 1 is real. The mosquito larva food chain in Book 2 is real. The halocline formation in Book 3 is real. We do not simplify the science — we make it funny.
Are these books good for dyslexic or reluctant readers?
These books were designed from the ground up with dyslexic and reluctant readers in mind. Short paragraphs, generous line spacing, conversational dialogue, humour-led storytelling, and an emotionally engaging protagonist all work together to reduce reading friction without reducing the quality of the content. Many parents report that their reluctant readers finish a George book in a single sitting.
What STEM and science topics does the series cover?
Across the 10-book series, children encounter: water chemistry and pH balance, osmosis and osmoregulation, the nitrogen cycle and biological filtration, food webs and trophic levels, mosquito biology and biological pest control, halocline formation and water density, aquatic respiration and gill function, fish physiology and stress response, ecosystem management and biodiversity, and marine vs. freshwater biology. All topics are embedded naturally inside the stories — never as lessons.
Do you provide free lesson plans for teachers?
Yes — our STEM Educator Hub contains free NGSS-aligned lesson plans for Books 1–3, comprehension and vocabulary quizzes, classroom posters, printable reading reward badges, and vocabulary sheets. All materials are available with no login, no paywall, and no student tracking. Visit the Educators page to download everything.
How many books are in the series and which are available now?
The complete Yechiel's Fishery Farm series is planned for 10 books across two story arcs. Books 1–3 (George the Cranky Guppy, George and the Mosquito Patrol, and George Meets the Salt Line) are currently available. Books 4–10 are in active production. You can sign up on our Books page to be notified the moment each new title releases.
What makes these books different from other STEM or science books for kids?
Most science books for children explain the concept first and add a story on top. We do the opposite: we tell a funny, emotionally real fish story, and the science emerges naturally from what the characters experience. George does not attend a lecture on osmosis — he wakes up in the wrong tank and his body starts doing things he does not understand. Children absorb the biology because they are too busy worrying about George to notice they are learning.
Is this series suitable for classroom use?
Absolutely. The series is used in elementary classrooms as a companion to life science and ecosystems units. Each book comes with a full chapter-by-chapter teacher guide, discussion questions, key vocabulary, and a hands-on classroom activity. The books satisfy NGSS standards for grades 2–5 and support cross-curricular integration of science and English language arts.
More questions? Contact us →