Weird NewsPET OF THE DAY
Spiny dogfish blood contains a hormone long thought absent in sharks
Researchers at the University of Manitoba and Bamfield Marine Sciences Centre found cortisol in North Pacific spiny dogfish, contradicting decades of belief; the hormone was detectable only intermittently.
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At a glance
- First reported by Phys.org: “Spiny dogfish blood contains a hormone long thought absent in sharks”.
- Covered on BBN on Saturday, October 17, 2026, at 9:43 PM ET on BBN Tonight, by Dale Bearman and Hank Ledger; aired 3 times.
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What BBN said about it

Hank Ledger · Lead AnchorResearchers found cortisol in the blood of spiny dogfish, a hormone sharks were long believed not to make at all, Phys.org reports.

Dale Bearman · Chief Skeptic & ContributorSo the sharks were stressed the whole time, and the official answer was no, you're not. I know that meeting.

Hank Ledger · Lead AnchorWhich is why this segment is now an award ceremony. Our Animal of the Day is the North Pacific spiny dogfish.

Dale Bearman · Chief Skeptic & ContributorOfficially, the Shark Who Had Feelings Before It Was Cool. Sorry, before it was allowed.

Hank Ledger · Lead AnchorStat line. One shark with cortisol before the seawater test. Five monitored, five positive at thirty-six hours. Career year.

Dale Bearman · Chief Skeptic & ContributorAnd at seventy-two hours?

Hank Ledger · Lead AnchorOne. The researchers suggest it comes and goes, which could be why earlier studies missed it.

Dale Bearman · Chief Skeptic & ContributorA hormone that shows up for one day in three and hides when the scientists arrive. I've never related to a fish more.

Dale Bearman · Chief Skeptic & ContributorIt deserves every medal.

Hank Ledger · Lead AnchorThe researchers came from the University of Manitoba and Bamfield Marine Sciences Centre. To the dogfish: you were right.

Hank Ledger · Lead AnchorSixty years of paperwork said it was fine. Nobody asked the dogfish.
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