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Wednesday, May 21, 2025

Jellyfish Scientist: Maude Delap and Her Mesmerizing Medusas. Written by Michelle Cusolito and illustrated by Ellen Rooney. Charlesbridge, Penguin Random House. 2025. $22.99 ages 8 and up

 


"June 27, 1899
        Day 7 

Most people wouldn't enjoy staring at a jar of 
tiny larvae, but Maude studies them every day.
Some have attached to the jar! Will they become 
adults?

The year is 1899. The place is Ireland's rugged coast. Maude Delap is out for a row, collecting scientific specimens. Without any training in science (at the time she was expected to spend her life as a wife and mother), she has learned enough to be an expert about the marine life of the North Atlantic Ocean where she lives. 

On this particular day, Maude captures a compass jellyfish. Little is known about them, and no one has ever kept one alive through its entire life cycle. Maude wants to change that. Her lab (the Department) has a distinct marine odor. There, she conducts her work when she has nothing else of importance to be doing for her family. 

It is great good luck that Maude discovers tiny specks in the water. Larvae, called planulae, hold Maude's attention day after day. As she carefully watches, they become polyps while Maude sketches their changes. Through it all, she collects fresh seawater to keep their environment viable for growth and development. It is hard work. She learns about their preferred diet, and continues to keep them alive by rowing through the blustery winter and in freezing water. 

Nearly nine months later, they begin to change shape again. 

"She watches as one polyp shivers and wiggles. 
Its tentacles shrink and the tube turns pink. Five 
rings form like belts cinched too tight around the 
animal's body. The rings separate into a stack of 
lacy-looking layers.
"

They pump and pop! until a tiny jellyfish releases itself from the stack and pushes off. It happens again and again. Will Maude be able to keep them alive? Watching the biggest ephyra (adult jellyfish) eat all the smaller ones, Maude is astonished to be left with only one after all the work. After starting her diary and sketches on June 22, 1899 and watching the jellyfish grow from planulae to medusa, she continues to change the water daily and collect the kinds of jellyfish the medusa will eat. 

On July 8, 1900, the medusa has reached its full adult form; Maude is the first scientist to raise a jellyfish in captivity. She is not done yet. Next up - a blue jellyfish. The work begins once more. 

Back matter includes further facts about jellyfish, a short report on Maude's life and work, notes from both author and illustrator, a list of places for further learning and acknowledgements of those who helped with the research. 

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