Fredrik Jutfelt 🐠
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jutfelt.bsky.social
Fredrik Jutfelt 🐠
@jutfelt.bsky.social
4.4K followers 1.1K following 340 posts
Animal physiology, marine biology, fish, climate change, scientific integrity, science and academia. Professor @goteborgsuni.
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Fredrik Jutfelt 🐠 @jutfelt.bsky.social · Nov 3
Interested in thermal biology? Please join our new and growing grass roots initiative, the Thermal Ecology Alliance, initiated by @patricepottier.bsky.social. 🧪🐟🦑🌡️

Sign up here: www.thermalecologyalliance.org#participation

Check who already signed up:
www.thermalecologyalliance.org#community
Fish embryos under the microscope
Reposted by Fredrik Jutfelt 🐠
zebrafishrock.bsky.social
Wild zebrafish swimming among the aquatic plants in North Bengal. Credit to @jutfelt.bsky.social. #ZebrafishZunday 🧪
February 8, 2026 at 9:41 AM
jutfelt.bsky.social
Two permanent Associate Professor positions in botany at the excellent University of Gothenburg! Open to international candidates.

Cryptogams:
web103.reachmee.com/ext/I005/103...

Vascular plants:
web103.reachmee.com/ext/I005/103...

@naturvetenskap.bsky.social
January 20, 2026 at 8:49 AM
jutfelt.bsky.social
PhD position in fish ecology at the university of Gothenburg @naturvetenskap.bsky.social with fieldwork at Kristineberg marine station @kristinebergcenter.bsky.social

Apply here: web103.reachmee.com/ext/I005/103...
January 18, 2026 at 1:02 PM
jutfelt.bsky.social
Scandinavia ❤️

www.science.org/content/arti...
I thought science hinged on prestige. Moving abroad made me reassess my priorities
In Denmark, this Ph.D. student fell in love with an egalitarian society that values work-life balance
www.science.org
December 30, 2025 at 3:15 PM
Reposted by Fredrik Jutfelt 🐠
jethroreading32.bsky.social
As we really enter the home straight for #25DaysOfFishmas, Day 23 brings us probably the cutest little monospecific family on our list. This is Capros aper, the boarfish, the only known member of the Caproidae.
A small mottled orange-red-grey fish is held in a black gloved hand. It is roughtly diamond shaped, with a humped back and a huge, sharply spined dorsal fin. The mouth is small and protruding, and the eye is bright and intelligent looking. Own photo.
December 23, 2025 at 10:21 AM
jutfelt.bsky.social
AI-hallucinated paper now cited 44 times according to Google scholar! This is not good.
benpatrickwill.bsky.social Ben Williamson @benpatrickwill.bsky.social · Dec 19
And so checked out Google Scholar. Now on my profile it doesn't appear, but somwhow on Nelli's it does and ... and ... omg, IT'S BEEN CITED 42 TIMES almost exlusively in papers about AI in education from this year alone... scholar.google.com.vn/citations?vi...
scholar.google.com.vn
December 21, 2025 at 11:47 AM
Reposted by Fredrik Jutfelt 🐠
ecoinvasions.bsky.social
No paper from me or my lab will ever be submitted to an MDPI journal - including any of their superfluous "special issues". I will very rarely (if ever) cite MDPI papers. And I will never review for them. deevybee.blogspot.com/2024/08/gues...

The same goes for FrontiersIn journals, among others.
December 16, 2025 at 4:21 AM
Reposted by Fredrik Jutfelt 🐠
rasmusern.bsky.social
Convert your FireSting-O2 meter from @pyroscience.bsky.social into a O2 regulator for less than €500

My paper with @jutfelt.bsky.social in @conphysjournal.bsky.social describes the OptoReg system: a simple and inexpensive solution for regulating water oxygen.

Funded by EU’s H2020, MSCA (No 893895)
December 21, 2025 at 10:23 AM
Reposted by Fredrik Jutfelt 🐠
mads100tist.bsky.social
"We are the Hot people" @jutfelt.bsky.social
December 12, 2025 at 9:19 AM
Reposted by Fredrik Jutfelt 🐠
zebrafishrock.bsky.social
Consider joining this initiative, if your research/interests overlap with its mission 🗺️
jutfelt.bsky.social Fredrik Jutfelt 🐠 @jutfelt.bsky.social · Dec 9
The Thermal Ecology Alliance is approaching 1000 members! Join here: www.thermalecologyalliance.org/participation
December 12, 2025 at 9:14 AM
Reposted by Fredrik Jutfelt 🐠
jutfelt.bsky.social
The Thermal Ecology Alliance is approaching 1000 members! Join here: www.thermalecologyalliance.org/participation
December 9, 2025 at 11:06 AM
Reposted by Fredrik Jutfelt 🐠
mridulkthomas.bsky.social
Looks like an exciting network!

There are so many interesting, important questions that we could address well with some more co-ordination.
jutfelt.bsky.social Fredrik Jutfelt 🐠 @jutfelt.bsky.social · Dec 9
The Thermal Ecology Alliance is approaching 1000 members! Join here: www.thermalecologyalliance.org/participation
December 9, 2025 at 11:59 AM
jutfelt.bsky.social
The Thermal Ecology Alliance is approaching 1000 members! Join here: www.thermalecologyalliance.org/participation
December 9, 2025 at 11:06 AM
jutfelt.bsky.social
Here is an excellent article on the issues with STOTEN journal, and with scientific publishing in general:
english.elpais.com/science-tech...
The fall of a prolific science journal exposes the billion-dollar profits of scientific publishing
One of the 15 publications that put out the most studies globally has been expelled from the indexing system for irregularities. Its publisher, Elsevier, has a 38% profit margin that reached $1.5 bill...
english.elpais.com
December 2, 2025 at 7:27 AM
jutfelt.bsky.social
Amazing growth of the Thermal Ecology Alliance this week!

Join here www.thermalecologyalliance.org/participation
🐟🧪
November 28, 2025 at 2:08 PM
Reposted by Fredrik Jutfelt 🐠
danielgorelick.bsky.social
Great time to remind folks that Biology Open pays humans to review manuscripts, decisions with reviews in 7 working days from submission, no AI slop journals.biologists.com/bio/pages/fa...
November 28, 2025 at 1:58 PM
Reposted by Fredrik Jutfelt 🐠
plosbiology.org
Oxygen limitation is considered a key mechanism of #ThermalTolerance. @dianasmadeira.bsky.social explores how a @plosbiology.org study challenges this idea, showing minimal protective effects of O2 supersaturation in heat-stressed #aquatic #ectotherms 🧪 Paper: plos.io/43hzMQa Primer: plos.io/3XeUtbS
The effects of temperature on organismal performance are depicted using thermal performance curves, where performance is greatest at the optimal temperature and starts to decrease toward cooler or warmer temperatures, reflecting the thermal window (tolerable range of temperatures) of the species. Briefly, the Oxygen and Capacity Limited Thermal Tolerance hypothesis proposes that oxygen limitation explains the performance decline at high temperatures and sets the first boundary for thermal limits across ectotherms. This is due to a mismatch between the oxygen demand of the organism and the capacity of the cardiorespiratory system to supply oxygen to tissues when the organism is under warming. This concept is central to predict species responses to warming. As oxygen supersaturation in water has been shown to alleviate oxygen supply limitations by increasing maximum rates of oxygen transport in blood, Raby and colleagues (2025) tested the effects of oxygen supersaturation on thermal tolerance across 14 aquatic species. The authors found that it had negligible effects on upper thermal limits, challenging the oxygen limitation hypothesis as a universal mechanism underpinning thermal tolerance of aquatic ectotherms. The authors highlight that oxygen supersaturation in water, a naturally occurring phenomenon in shallow waters, may not protect aquatic species from the effects of extreme heat.
November 6, 2025 at 1:55 PM
Reposted by Fredrik Jutfelt 🐠
graham-raby.bsky.social
Very exciting to finally have this work out there. Thanks to the team at @plosbiology.org for being willing to publish null results!
plosbiology.org PLOS Biology @plosbiology.org · Nov 6
Oxygen supersaturation is proposed to buffer against #HeatStress in water-breathing animals. @graham-raby.bsky.social @jutfelt.bsky.social &co re-examine this question in diverse #aquatic #ectotherms, showing that #hyperoxia has minimal impact on thermal tolerance @plosbiology.org 🧪 plos.io/43hzMQa
Effect of hyperoxia (150% air saturation) on warming tolerance in 14 aquatic ectotherms from across the globe. Left: Forest plot showing effect sizes (model estimates ± 95% confidence intervals) for the effect of hyperoxia on warming tolerance. Black symbols are the fast warming (0.3°C min−1) trials, blue symbols are the slow warming (1°C h−1) trials, and yellow symbols are for a net combined effect with random effects for subgroups of the 24 experiments. The effects were considered statistically significant where the 95% confidence interval does not cross the red vertical line. Right: Approximate geographical distributions for the 10 species of fish (top) and four species of decapod crustaceans (bottom) used in the laboratory experiments to assess the effects of hyperoxia on upper thermal tolerance.
November 6, 2025 at 3:03 PM
Reposted by Fredrik Jutfelt 🐠
plosbiology.org
Oxygen limitation is considered a key mechanism of #ThermalTolerance. @dianasmadeira.bsky.social explores how a @plosbiology.org study challenges this idea, showing minimal protective effects of O2 supersaturation in heat-stressed #aquatic #ectotherms 🧪 Paper: plos.io/43hzMQa Primer: plos.io/3XeUtbS
The effects of temperature on organismal performance are depicted using thermal performance curves, where performance is greatest at the optimal temperature and starts to decrease toward cooler or warmer temperatures, reflecting the thermal window (tolerable range of temperatures) of the species. Briefly, the Oxygen and Capacity Limited Thermal Tolerance hypothesis proposes that oxygen limitation explains the performance decline at high temperatures and sets the first boundary for thermal limits across ectotherms. This is due to a mismatch between the oxygen demand of the organism and the capacity of the cardiorespiratory system to supply oxygen to tissues when the organism is under warming. This concept is central to predict species responses to warming. As oxygen supersaturation in water has been shown to alleviate oxygen supply limitations by increasing maximum rates of oxygen transport in blood, Raby and colleagues (2025) tested the effects of oxygen supersaturation on thermal tolerance across 14 aquatic species. The authors found that it had negligible effects on upper thermal limits, challenging the oxygen limitation hypothesis as a universal mechanism underpinning thermal tolerance of aquatic ectotherms. The authors highlight that oxygen supersaturation in water, a naturally occurring phenomenon in shallow waters, may not protect aquatic species from the effects of extreme heat.
November 6, 2025 at 5:30 PM
Reposted by Fredrik Jutfelt 🐠
danielwanoble.bsky.social
We’ve started the Thermal
Ecology Alliance! Go grab a cup of TEA and join the movement www.thermalecologyalliance.org/participation
www.thermalecologyalliance.org
November 26, 2025 at 9:31 AM
Reposted by Fredrik Jutfelt 🐠
zebrafishrock.bsky.social
For those finterested!
jutfelt.bsky.social Fredrik Jutfelt 🐠 @jutfelt.bsky.social · Nov 26
The Thermal Ecology Alliance is growing rapidly and we are now at 51 countries! Join here: www.thermalecologyalliance.org/participation
November 26, 2025 at 9:28 AM
jutfelt.bsky.social
The Thermal Ecology Alliance is growing rapidly and we are now at 51 countries! Join here: www.thermalecologyalliance.org/participation
November 26, 2025 at 9:04 AM
jutfelt.bsky.social
Salmon research and leadership position!
(Swedish / Scandinavian language required)

www.slu.se/om-slu/jobba...
November 21, 2025 at 3:29 PM
Reposted by Fredrik Jutfelt 🐠
lmcampbell.bsky.social
Chemosphere, now STOTEN. 👀😥
jutfelt.bsky.social Fredrik Jutfelt 🐠 @jutfelt.bsky.social · Nov 19
STOTEN is now dead. It has been completely removed from Web of Science mjl.clarivate.com/search-results
jutfelt.bsky.social Fredrik Jutfelt 🐠 @jutfelt.bsky.social · Oct 21
Warning to environmental scientists! 🧪🦑🌎🐟

The journal STOTEN has been placed on hold by Clarivate, meaning it is under investigation and may lose its indexing (including impact factor). Consider publishing elsewhere.

mjl.clarivate.com/search-results
November 20, 2025 at 12:47 PM
jutfelt.bsky.social
STOTEN is now dead. It has been completely removed from Web of Science mjl.clarivate.com/search-results
jutfelt.bsky.social Fredrik Jutfelt 🐠 @jutfelt.bsky.social · Oct 21
Warning to environmental scientists! 🧪🦑🌎🐟

The journal STOTEN has been placed on hold by Clarivate, meaning it is under investigation and may lose its indexing (including impact factor). Consider publishing elsewhere.

mjl.clarivate.com/search-results
November 19, 2025 at 1:39 PM