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A large group of yellowfin tuna swimming off the coast of Italy. Like all fish, they sleep, but it’s not like human sleep. Giordano Cipriani/The Image Bank via Getty Images

September 5, 2022

Sleeping fish? From sharks to salmon, guppies to groupers, here’s how they grab a snooze

Michael Heithaus, Florida International University

Just about every creature on Earth needs to grab some Zs from time to time. Imagine trying to doze while dodging great whites and killer whales.

The Giant Sea Bass at the California Academy of Sciences. Fishes'sense of smell is highly affected by high level of carbon dioxide in the ocean. Togabi/Wikimedia

November 29, 2018

Ocean fish are under threat if we don’t curb carbon dioxide emissions

Cosima Porteus, University of Exeter

Increase of carbon dioxide in the ocean affects the way fish detect predators, mates or food and could threaten not only individual fish but entire populations.

Fish leave bits of DNA behind that researchers can collect. Mark Stoeckle/Diane Rome Peebles images

April 12, 2017

Fishing for DNA: Free-floating eDNA identifies presence and abundance of ocean life

Mark Stoeckle, The Rockefeller University

Animals shed bits of DNA as they go about their lives. A new study of the Hudson River estuary tracked spring migration of ocean fish by collecting water samples and seeing whose DNA was present when.

Top contributors

Mark Stoeckle
Senior Research Associate in the Program for the Human Environment, The Rockefeller University
Cosima Porteus
Postdoctoral Fellow, Axa Research Fund Fellow, University of Exeter
Michael Heithaus
Executive Dean of the College of Arts, Sciences & Education and Professor of Biological Sciences, Florida International University

Articles on Saltwater fish

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