When did the first fish live on Earth – and how do scientists figure out the timing?

When did the first fish live on Earth – and how do scientists figure out the timing?

By Isaac Skromne

Source: roanoke

7/18/2022

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com.

How do you figure out how long ago fish were created? Hundreds of millions of years is a long time ago. – Josh, age 11, Ephrata, Pennsylvania

The oldest fossils of animals resembling a fish date back between 518 million and 530 million years ago. Discovered in China and called Haikouichthys, these animals were about an inch long (2.5 cm) and had a head with seven to eight slits at its base that looked like gills. They also had a distinct spine surrounded by muscles.

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News Id		Source	Stamp	country
3401	Rare anglerfish spotted on San Diego beach	cbs8	2021-11-23	US
3402	No routine checkups on welfare of fish at slaughter, officials admit	theguardian	2021-11-23	UK
3403	Rare ornamental fish from Assam on the brink of extinction	mongabay	2021-11-17	IN
3404	Archaeology breakthrough after discovery of ancient human fishing rod: 'Amazing'	express	2021-11-21	UK
3405	Florida man takes children without father figures on fishing excursions	Fox News	2021-11-22	US
3406	Record-breaking fish fought Pennsylvania angler for 25 minutes, but lost the battle	centredaily	2021-11-16	US
3407	Fish store owner gets probation for selling endangered and invasive fish	Pittsburgh Post-Gazette	2021-11-18	US
3408	The cost of a fish sandwich: Why we need to reduce bycatch by Alaska’s trawl fleet	adn	2021-11-20	US
3409	How Did A 72-Pound Carp End Up In Humboldt Park’s Lagoon? Big Catch Could Be From A Decades-Old Mistake, Experts Say	blockclubchicago	2021-11-15	US
3410	Thai woman's bedroom turns into aquarium full of fish after heavy rainfall	mashable	2021-11-09	VN
3411	Fishing boat seized after crew caught set netting in prohibited area	stuff	2021-11-10	NZ
3412	Huge fish tracked on the James River, project will help to manage “Giants of the James”	wfxrtv	2021-11-11	US
3413	You can swim with the fish at St. Pete Beach's RumFish Grill	abcactionnews	2021-11-11	US
3414	Iran names newly discovered species of fish after Ali Daei	ifpnews	2021-11-15	IR
3415	Longtime Lorain library goldfish Nemo swims to a new home at Rainbow Babies and Children's Hospital	news5cleveland	2021-11-11	US
3416	Some of Earth’s longest-lived fish show how to reach extreme ages	nature	2021-11-12	US
3417	Cop26: Oceanographer Sylvia Earle calls for industrial fishing ban on high seas	theguardian	2021-11-10	UK
3418	Cambridge report recommends cutting the Riverside dam project	the record	2021-11-29	CA
3419	Castlewood creek popular despite E. coli levels	stltoday	2010-07-27	US
3420	Record 21.57 pound tautog caught off Newport	johnstonsunrise	2021-11-19	US
3421	A tiny Alaska town is split over a goldmine. At stake is a way of life	theguardian	2021-06-22	US
3422	Fish captured 'smoking cigarette' on camera saved before gobbling the entire thing	dailystar	2021-09-27	UK
3423	Zombie plant a threat to fish and even swimmers	CBC News	2021-09-07	CA

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