Holotype of Pterobunocephalus carvalhoi from the Napo River basin, Ecuador, coordinates 00°27’53”S 76°19’09”W, MEPN-I 20199, 69.9 mm SL. Scale bar = 10 mm. Photo by P. Argüello.

Crispim JL, P Argüello, GSC Silva, C Oliveira, KR Luckenbill & MH Sabaj, 2026. After eight decades: a new species of Pterobunocephalus (Siluriformes: Aspredinidae) from the upper Putumayo, Napo and Pastaza rivers, Ecuador. Neotropical Ichthyology 24:e250162.🐟🧪

doi.org/10.1590/1982...

European red list of freshwater fishes - Publications Office of the EU The European Red List provides a scientifically rigorous and evidence-based assessment of the regional extinction risk of selected European taxa. This includes all vertebrate species - fishes, amphibi...

Happy to share with you the completely updated assessment of the conservation status of Europe’s 559 known freshwater fish species. Not happy to report that nearly 50% of them are threatened.

▶️ Here is the #IUCN report 👇
sohub.io/nvoz

Lineage-specific decoupling of arginine vasotocin-evoked aggression in male darters (Percidae: Etheostomatinae) The repeated evolution of parental care is often accompanied by shifts in the neural circuits and hormonal pathways that regulate motivation and aggre…

New paper led by @taylorblack.bsky.social shows AVT modulates aggression in darter lineages with nest site territoriality and paternal care but elicits no behavioral response in a species that secondarily lost territoriality and care www.sciencedirect.com/science/arti...

Once-Adventurous Salmon Can’t Believe She Ended Up Moving Back To Birthplace, Having A Bunch Of Kids

Once-Adventurous Salmon Can’t Believe She Ended Up Moving Back To Birthplace, Having A Bunch Of Kids theonion.com/once-adventurous-salmon-...

Diagram depicting phylogenetic relationships among several elongated catfishes.

Pleased to share a new phylogeny for the airbreathing or walking catfishes from the family Clariidae - part of my postdoctoral work at the AMNH in collaboration with Tobit Liyandja and Melanie Stiassny: www.sciencedirect.com/science/arti...

Tiny African fish caught climbing to the top of a 50-foot waterfall For over half a century, people in Central Africa have told tales of the fish seen climbing waterfalls, but these claims have never been officially confirmed. Now, these fish have finally been caught ...

Tiny shellear fish in central Africa scale a 50-foot vertical waterfall using suction cups and tiny hooks. This convergent evolution places them with some island gobies and Brazilian bumblebee catfish, who all do world class bouldering. 🐟🌍

phys.org/news/2026-04...

Rapid genome modifications including chromosomal fusions and large-scale inversions are key features in Arctic codfish species - Genome Biology Background Genome evolvability involves activation of transposable elements (TEs) that result in novel genomic rearrangements, including translocations, deletions, duplications, as well as larger stru...

Finally is the paper where we present the unique genomic architectures of the Arctic codfishes out!! Nice work by @gadus-sivus.bsky.social and co-authors …
@biovitenskap.bsky.social
@unioslo-cees.bsky.social

link.springer.com/article/10.1...

Spontaneous aging-associated inflammation and genome instability in the immune system of turquoise killifish - Nature Aging Turquoise killifish are naturally short-lived vertebrates that serve as a model system for aging. The authors show that killifish exhibit age-related transformation in the immune system, which rapidly...

Aging killifish show systemic inflammation and accumulating DNA damage in progenitor-like immune cells, offering a window into the evolutionarily conserved mechanisms of vertebrate immune aging.
Great work from Gabriele, @mdonertas.bsky.social, and the whole team.
www.nature.com/articles/s43...

Combining Multiple Genetic Estimates of Ne Researchers often use multiple genetic methods to estimate contemporary effective population size (Ne), but few formally combine estimates despite potential benefits for increasing precision. Maximis....

onlinelibrary.wiley.com/doi/10.1111/... Robin's new tool - looks nifty!

Reproductive fluids enabling cryptic female choice of paternity do not induce concomitant ejaculate-mediated paternal effects in embryos of hybridizing salmonid fishes Abstract. Post-ejaculatory sexual selection in the form of cryptic female choice provides opportunities for females to bias paternity to favour preferred m

Reproductive fluids enabling cryptic female choice of paternity do not induce concomitant ejaculate-mediated paternal effects in embryos of hybridizing salmonid fishes:

Lantiegne et al. 2026 @memorialu.bsky.social

doi.org/10.1093/jeb/...

Gene conversion empowers natural selection in a clonal fish species - Nature Analysis of the asexually reproducing Amazon molly Poecilia formosa and its sexually reproducing progenitors Poecilia mexicana and Poecilia latipinna reveals that it maintains a divergent mutational l...

Cool paper, turning evolutionary theory on its head - gene conversion overcomes the cost of asexual reproduction…

Gene conversion empowers natural selection in a clonal fish species www.nature.com/articles/s41...

Late Cretaceous bichirs from Madagascar provide the first documentation of Polypteriformes (Actinopterygii, Cladistia) in Eastern Gondwana Fossil polypterid elements have been recovered from the Upper Cretaceous (Maastrichtian) Maevarano Formation of Madagascar. These elements document th…

Polypterids (bichirs + ropefish) are the sister lineage of all other living ray-finned fishes. Restricted to Africa today, fragmentary fossils show they inhabited South America until at least the Paleocene. Now Late Cretaceous finds add Madagascar to the list: www.sciencedirect.com/science/arti...

It's final: No Delta smelt found in annual survey for 8 years as ecosystem collapses One of the most significant California water stories of this decade is the virtual extinction of the Delta Smelt in the wild and the collapse of the Sacramento-San Joaquin River Delta ecosystem that i...

So sad 📉 - they're just gone.

www.dailykos.com/stories/2026...

Different sex determination systems in two closely related Eurasian minnow (Phoxinus) species - Heredity Heredity - Different sex determination systems in two closely related Eurasian minnow (Phoxinus) species

#paperalert #fishes Two closely related minnow ( #Phoxinus ) species share the same rivers — and sometimes even hybridise. But new research shows they've evolved completely different ways of determining sex. 🐟🧬 Lead author PhD student @thetemi.bsky.social @leibnizlib.bsky.social

Phylogenetic distributions of minimum bathymetries for Mytilidae (A) and Lucinidae (B).

Contrasting diversification and invasion histories of bivalves to the deep sea:
"...evolutionary pathways to deep-sea endemicity are more often shaped by multiple, independent events than by in situ diversification"
royalsocietypublishing.org/rspb/article...
🧪 ⚒️ #Paleobio #EvoBio #Macroecology

I'm recruiting a Ph.D. student for Fall 2026.

Interested in comparative studies and trait evolution in fishes?

Send me an email with a CV and research interests. Please take a look at my website (jcorush.github.io ) for more information about my research.

#hybridization #minnows #mudskippers

New from #NearLab The role of ecology in allopatric speciation of darters in the Central Highlands, USA

shorturl.at/YEmxH

NEWS from Ohio State Fish Division: You can now search our 6,000-tissue collection on our website! 🐟

mbd.osu.edu/collections/...

Promoting the use of phylogenetic multinomial generalised mixed-effects model to understand the evolution of discrete traits Abstract. Phylogenetic comparative methods (PCMs) are fundamental tools for understanding trait evolution across species. While linear models are widely us

NEW METHODS ARTICLE: Phylogenetic GLMMs open doors to study evolution of discrete traits. We show how binary models extend to ordinal & nominal traits, using bird data, and provide tutorials to make these methods accessible to evolutionary biologists:

doi.org/10.1093/jeb/...
Mizuno et al.

You can do it using the Network Analysis toolbox in QGIS. There is a "shortest path" option. I recall there was a way to make a distance matrix between all of your point based on a specific layer, your rivers.

My lab focuses on:
-Nest association/breeding behavior evolution in N. American Minnows.
-Mudskipper evolution and biogeography.

But I am open to other related projects addressing #hybridization #PhylogeneticComparativeMethods #LandscapeGenetics #biogeography

email: jcorush @ Illinoistech. edu

@jcorush.bsky.social is looking for a PhD student

I'm recruiting a Ph.D. student for Fall 2026.

Interested in comparative studies and trait evolution in fishes?

Send me an email with a CV and research interests. Please take a look at my website (jcorush.github.io ) for more information about my research.

#hybridization #minnows #mudskippers

Restoring the Klamath River - Tomorrow's Catch Witness the Klamath River’s transformation as dam removal restores salmon habitat, tribal lands, and cultural connections in this historic restoration.

The Klamath River is flowing free again.

RES and local Indian Tribes are restoring habitat, renewing cultural ties, and leading the largest dam removal in history.

🎥 Watch the film + explore the series: contentwithpurpose.co.uk/afs/tomorrow...

Accumulation of a Biparentally Inherited Neptune Transposable Element in Natural Killifish Hybrids (Fundulus diaphanus × F. heteroclitus) Abstract. Transposable elements (TEs) are abundant selfish genetic elements that can mobilize in their host genome, causing DNA damage, mutations, and chro

Roussel, Suh, @fjruizruano.bsky.social & @amdioncote.bsky.social characterized TE content in naturally occurring killifish hybrids, finding higher TE load and accumulation of Neptune subfamilies in hybrids.

🔗 doi.org/10.1093/molbev/msaf266

#evobio #molbio #TEsky

Two BLM employees tag fish in Alaska.

A new report reveals that fish and wildlife conservation generates substantial economic benefits. Federal, state, local, and nonprofit contributions combined contributed $115.8 billion in total economic activity and supported over 575,000 jobs nationwide. Read more: fisheries.org/2025/11/new-...

MBE | Temperature and Pressure Shaped the Evolution of Antifreeze Proteins in Polar and Deep Sea Zoarcoid Fishes A graphic visualizing the finding by Bogan et al. that antifreeze protein (AFP) genes increased in copy number among shallow-water, polar species of Zoarcoidei fishes. Top left: Pholis gunnellus photographed by Chris Isaacs (CC-BY-NC). Top right: Cebidichthys violaceus photographed by Alex Heyman (CC0 1.0). Bottom left: Lycenchelys sp. photographed by Julien Savoie (CC BY 4.0). Bottom right: Lycodes sp. photographed by Julien Savoie (CC BY 4.0).

@snbogan.bsky.social @notothentoma.bsky.social @scotthotaling.bsky.social @paulbfrandsen.bsky.social et al. explore the evolution of type III antifreeze proteins in deep sea zoarcoid fishes.

🔗 doi.org/10.1093/molbev/msaf219

#evobio #molbio

Distinct evolutionary signatures underlie body shape diversity across deep sea habitats Abstract. The deep sea is known for extreme biological conditions such as high pressure, little-to-no solar light and cold temperatures. Despite these chal

New paper on deep-sea fish diversity out now in @sse-evolution.bsky.social, with @cmartinez.bsky.social and @sarahtfried.bsky.social

academic.oup.com/evolut/advan...

Submit your ideas to the 100% Wisconsin Fish contest | Wisconsin Sea Grant The contest is seeking creative ideas on how to use all parts of Great Lakes fish.

There's more to fish than the fillet, and we need your ideas on how to use it!

Submit your suggestions on how to use the whole fish to the 100% Wisconsin Fish contest for a chance to win a #GreatLakes prize pack.

www.seagrant.wisc.edu/news/submit-...

Non-anthropogenic cosmopolitan species ranges are scarce
Mugil cephalus, traditionally considered a (quasi)cosmopolitan diadromous fish species, is now shown to comprise some 15 different lineages deserving formal species description
www.sciencedirect.com/science/arti...