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Harkness Laboratory of Fisheries Research

@harknesslab.bsky.social
168 followers 207 following 24 posts

Harkness Laboratory of Fisheries Research. An Ontario Ministry of Natural Resources field station on Lake Opeongo, Algonquin Park. Beginning in May 1936. Posting: Mark Ridgway Harkness.ca

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taber @kvetch.gay · 01/10/2026
one reason Lake Superior is so much deeper than the other Great Lakes is that unlike the others, much of it is in an ancient rift valley — about a billion years ago the North America craton started splitting, but failed, leaving behind the Midcontinent Rift System, a deep intrusion in the Earth
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Anthony Ricciardi @ecoinvasions.bsky.social · 26/09/2026
OTD in 1962, Silent Spring was published. “Nature has introduced great variety into the landscape, but man has displayed a passion for simplifying it. Thus he undoes the built-in checks and balances by which nature holds the species within bounds.” ― Rachel Carson, Silent Spring
Rachel CarsonThe front cover of Silent Spring.
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Fredrik Jutfelt 🐠 @jutfelt.bsky.social · 19/09/2026
A foundational paper on the effects of ocean acidification on fish behaviour is retracted! "neither the publisher nor the editor has confidence in the article, primarily because the data provided during the investigation were not consistent with the observation methods described in the article."
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Mathew Wells @efdtoronto.bsky.social · 31/08/2026
Snow was falling on the high Arctic lake where we deployed a thermistor chain to monitor winter dynamics
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Kristen Behrens, PhD @behrenskristen.bsky.social · 30/08/2026
Schemed myself up a side project that allows me to flee my laptop and hang out with the cool kids at the museum! Ciscoes are a taxonomic nightmare and genetic work from the lab is raising questions about two species. So we go to the types! Pray we have luck extracting from formalin fixed tissues 🫣
Photo of a museum back room, jars of fish are on metal racks.Photo of a 100 year old fish pinned to a foam board for measurement. It is a truly appalling shade of brown.
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ProfColinBean @profcolinbean.bsky.social · 02/08/2026
Trophic Niche Partitioning Between Lake Whitefish and Cisco: Post-glacial Patterns and Response to Anthropogenic Cisco Introductions . Canadian Journal of Zoology. Just-IN doi.org/10.1139/cjz-...
doi.org
Canadian Science Publishing
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Tom Near @tjnear.bsky.social · 29/07/2026
🧵1/6 New paper from #NearLab dropped! Wood et al. (2026) tackle a long-standing mystery: how did freshwater perches, walleyes, and darters (Percidae) end up on BOTH sides of the Atlantic? Spoiler: they may have swum there. 🐟🌊 #Ichthyology #Evolution #Systematics
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Tom Near @tjnear.bsky.social · 08/07/2026
🧵 1/11New paper alert! One of two out today from #NearLab Ever heard of the Holiday Darter? These beautiful freshwater fish are hiding a big biodiversity secret in the rivers of Georgia, Alabama, & Tennessee and new genomic data is revealing it. A thread 👇
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Tom Near @tjnear.bsky.social · 08/07/2026
🧵1/11 New paper alert! One of 2 out today from #NearLab. Tunas are basically the superheroes of the ocean — warm-blooded, massive, and blazing fast. But HOW did they get that way? A new study just cracked open 50+ million years of evolutionary history. Let's dive in. 🐟⬇️
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Matt Herbert @matteherbert.bsky.social · 07/05/2026
Two hundred years of historical spawning and nursery data for ciscoes and whitefishes in the #GreatLakes. www.nature.com/articles/s41...
nature.com
Two hundred years of historical spawning and nursery data for coregonine fishes in the Laurentian Great Lakes - Scientific Data
Scientific Data - Two hundred years of historical spawning and nursery data for coregonine fishes in the Laurentian Great Lakes
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Jeff Bowman @jeffcbowman.bsky.social · 18/04/2026
Home of the Kawartha Flying Squirrel Project, which is starting its 25th year. Sound on.
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Canadian Journal of Zoology @canjzoology.bsky.social · 16/04/2026
⭐EDITOR'S CHOICE⭐ Brook trout thermal habitat selection in stratified lakes: diel patterns, body size, and the importance of thermal time 🌎 ✒️Stewart et al.🔗 ow.ly/tScz50YJYxk 📷 ow.ly/ynbo50YJYxi #OpenAccess #ThermalEcology #FishEcology #🌱
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John Bistline @bistline.bsky.social · 01/04/2026
This is my favorite climate change chart. Japanese monks, aristocrats, and emperors kept meticulous records of cherry blossom festivals for 1,200 years and accidentally built the world's longest climate dataset.
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José Cerca @naturalselection.bsky.social · 30/03/2026
We just published a review 🗞️😁: ‘The ecology of adaptive radiation’ revisited: A 25-year reflection Dolph Schluter’s book inspired the interest in adaptive radiation, and we wanted to revisit it. academic.oup.com/evolinnean/a... 1/5 🧵
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Zak Slagle @zakslagle.bsky.social · 30/03/2026
Final year of tracking Smallmouth Bass in Lake Erie tributaries. I'm going to miss this spring paddle on Conneaut Creek! @glatos-fish.bsky.social
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Kathryn R Elmer @profkathrynelmer.bsky.social · 14/03/2026
new paper out today! led by @thefentagon.bsky.social national-level diversity of Arctic charr in Scotland 🐟 🧬 genetic footprints of glacial lakes found in today's pops spanning central divide 👀 🐟 #openaccess paper in @biojlinnsoc.bsky.social @profcolinbean.bsky.social @ColinEAdams
academic.oup.com
The historical patterns that have shaped contemporary genetic differentiation across populations of Arctic charr in Scotland
Abstract. Glacial history is an important contributor to contemporary biogeographical patterns because it has resulted in population fragmentation and cons
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Canadian Journal of Zoology @canjzoology.bsky.social · 12/03/2026
Sticklebacks have taught us how evolution works in real time. The Canadian Journal of Zoology invites papers for a collection marking three decades of stickleback research. Deadline: May 31, 2026 🐟▶️ ow.ly/y0ic50YpIqu #Stickleback #Evolution #Zoology
X-ray image of a stickleback fish skeleton highlighting three decades of research in the Canadian Journal of Zoology.
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Erin Stewart @erinmcstewart.bsky.social · 12/03/2026
The proofed version of our CJZ paper is now online! 🐟 We studied patterns of brook trout thermal habitat selection during peak summer temps in 3 Algonquin Provincial Park lakes 🏕️ With @tmiddel.bsky.social & @harknesslab.bsky.social @canjzoology.bsky.social dx.doi.org/10.1139/cjz-2025-0087
dx.doi.org
Canadian Science Publishing
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Darren Wilkinson @darrenjw.bsky.social · 01/01/2026
Some lecture notes on spatial and temporal modelling, illustrated using R - darrenjw.github.io/spatio-tempo... - #rstats #rspatial #quarto
darrenjw.github.io
Spatial and temporal statistics
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HulloThere @jethroreading32.bsky.social · 09/12/2025
For Day 9 of #25DaysOfFishmas, we're heading back to Australia to meet perhaps the most evolutionarily isolated species on our list. This is Lepidogalaxias salamandroides, the salamanderfish, which is not only the only member of its family, nor order, but is the only member of its *superorder*!
Lepidogalaxias sitting on a leaf in a tanks. It is sausage shaped, with a large tail fin and a funny litlte bullet-shaped head. Credit: Gerald Allen via Western Australian Museum
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Harkness Laboratory of Fisheries Research @harknesslab.bsky.social · 07/12/2025
Our latest.... among lakes & over a decade in a large lake. A stationary habitat model Some Like It Cold: A General Habitat Association Model for Smallmouth Bass in Stratified Lakes - Ridgway - 2026 - Ecology of Freshwater Fish - Wiley Online Library onlinelibrary.wiley.com/doi/10.1111/...
onlinelibrary.wiley.com
Some Like It Cold: A General Habitat Association Model for Smallmouth Bass in Stratified Lakes
Models describing associations between fish distribution and environmental or spatial gradients at the population level have the potential to be transferrable if model parameters are stationary among....
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Journal of Animal Ecology @animalecology.bsky.social · 11/11/2025
🌡️ Alternative behavioral responses can buffer animals from environmental stress, yet the trade-offs of habitat selection remain poorly understood. Using a bioenergetics framework, researchers show different energetic strategies for a cold-water fish ➡️ buff.ly/l1GIXBf
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Arctic Science Journal @arcticsciencej.bsky.social · 06/10/2025
New in Arctic Science: Long-term vertebrate research and monitoring sites in Arctic Canada explores decades of wildlife studies across the North and the lasting legacy of these field stations. Read more ▶️ buff.ly/hluh47u #ArcticScience #WildlifeResearch #ArcticCanada
Small shorebird with brown and white feathers standing in shallow Arctic water surrounded by seaweed and ripples.
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Scott Milne (Milne Technologies) @milnetechnologies.ca · 10/09/2025
Wishing you calm seas @alltooclearfilm.bsky.social! In partnership with @harknesslab.bsky.social and @lakeheaduniversity.bsky.social, we will be sinking an autonomous up-looking echosounder that will ping 24/7 to help understand the diel behaviour of fish and zoop at Sup Shoal. Be sure to tune in!
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John Wares @johnwares.bsky.social · 19/08/2025
Aren't they lovely? Congratulations to my great colleague Bud Freeman, this is the culmination of over a decade of work! www.mapress.com/zt/article/v...
mapress.com
Two new species of Micropterus (Centrarchidae) endemic to Atlantic Slope river drainages in Georgia, South Carolina and North Carolina, U.S.A. | Zootaxa
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Anthony Ricciardi @ecoinvasions.bsky.social · 15/08/2025
1/ Who published the first freshwater food web? American ecologist Victor Shelford may have done so (see below) in his classic 1913 monograph "Animal communities in temperate America as illustrated in the Chicago region", a book that inspired Charles Elton (who cited it in Animal Ecology)...
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Bradley E. Howell @bradhowelll.bsky.social · 10/07/2025
Some great talks on fish metabolism, thermal tolerance, and bioenergetics by folks from @trentuniversity.bsky.social at this year’s #SEBconference in Antwerp, Belgium. @sebiology.bsky.social @erinmcstewart.bsky.social @jaydebon.bsky.social @chris-on-fish.bsky.social
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EcoNana @eco-nana.bsky.social · 09/07/2025
Think La Niña years are “cool”? Not anymore. Even our coolest years today are hotter than the hottest El Niño years of the past. Climate change is flipping the script — fast. A huge thank you to @zacklabe.com for his amazing graphic!
eco-nana.com
La Niña Years—Our “Cool” Years—Are Now Warmer Than El Niño Years
Every year, Earth’s temperature changes a little. Sometimes it gets hotter, and sometimes cooler. Scientists track this closely to understand how our climate is changing. But it’s not just about clima...
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Conservation Physiology @conphysjournal.bsky.social · 09/04/2025
Home is where the heat is (for brook trout that is) Intrigued? Then check out this latest #ConPhys in Action piece, explaining the importance of local conditions to 🐟 temperature tolerance, and therefore for #Conservation planning. Comments on Stewart et al (links in 🧵⬇️ )
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Beth Hoots @whatahoot.bsky.social · 08/07/2025
A terrific afternoon for fish biology here at #SEBconference ❤️🐟 Great talks by @leeuwisrobin.bsky.social, Moa Metz, and @erinmcstewart.bsky.social about different ways that fish respond to climate warming!
A scientist presents her take-away slide on a large dark stage. It reads: Take-away
• Zebrafish can evolve improved growth at warmer temperatures
• Thermal performance curves can undergo a left or right shift
• Ectothermic vertebrates may adapt to global warming by enhancing performance
• Role of selection in shaping thermal resilenceA scientist presents her title slide on a large stage, it features a beautiful picture of a brook trout. A scientist presents the methods of her research on a large screen
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Canadian Journal of Zoology @canjzoology.bsky.social · 06/05/2025
Meta-analysis reveals that density-dependent growth, survival, and their trade-off vary systematically among habitats and taxa buff.ly/DgfgJYQ
Line graph with error showing relationship between growth and survival across birds, fish, herptiles, invertebrates, and mammals.
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Algonquin Ice Out Bot @iceoutbot.bsky.social · 26/04/2025
Current #IceOut conditions in Algonquin Park. Image courtesy of The Friends of Algonquin Park.
A webcam shot of Lake of Two Rivers in Algonquin Park.
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Harkness Laboratory of Fisheries Research @harknesslab.bsky.social · 25/04/2025
And often at high densities, so important food web participants
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Tom Near @tjnear.bsky.social · 25/04/2025
Second paper this week from #NearLab!
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Harkness Laboratory of Fisheries Research @harknesslab.bsky.social · 29/03/2025
Elton's day. @ecoinvasions.bsky.social thanks for the reminder Interesting Harkness connection... 1/x
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Anthony Ricciardi @ecoinvasions.bsky.social · 28/03/2025
Born on March 29, 125 years ago: One of the most influential ecologists of the 20th century and the father of animal ecology, who turned natural history into a science: Charles Sutherland Elton (1900-1991). A birthday thread… 🧵[1/8]
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Benjamin Hlina, PhD @benjaminhlina.bsky.social · 22/03/2025
Trophic Ecologists - new pkg alert - {trps} (pronounced ‘tropes’): Bayesian Trophic Position Models using 'Stan'. Estimates trophic position using equations from Post (2002), Vander Zanden & Vadeboncoeur (2002), & Heuvel et al. (2024). benjaminhlina.github.io/trps/ #rstats #ecology #foodwebs
benjaminhlina.github.io
Bayesian Trophic Position Models using stan
Bayesian trophic position models using stan by leveraging brms for stable isotope data. Trophic position models are derived by using equations from Post (2002) <doi:10.1890/0012-9658(2002)083[0703:USI...
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Canadian Science Publishing @cdnsciencepub.com · 20/03/2025
How do habitat conditions, water flow, and #climatechange shape fish populations? A new CJFAS collection honours Dr. Boisclair’s research on these key topics ▶️ ow.ly/B4vl50UYTCf 📸 Eva Enders
Image of water stream with trees. Photo credit Photo credit: Eva Enders. CJFAS logo with text overlay: An understanding of the processes regulating fish production.
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Harkness Laboratory of Fisheries Research @harknesslab.bsky.social · 21/02/2025
3-2 in overtime Amazing game on ice; Perfect ... off ice
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Harkness Laboratory of Fisheries Research @harknesslab.bsky.social · 14/02/2025
Today at Harkness. Thanks Lucas....
Feb 14 2025 at Harkness Laboratory of Fisheries Research
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Harkness Laboratory of Fisheries Research @harknesslab.bsky.social · 08/02/2025
Thanks, Louise, for highlighting this. Agree. Fieldwork brings authenticity - for the public, for ourselves, and for applications. Undergrads & grads from our field station are always in demand.
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Dr. Lauren Stachowiak @laurenstacho.bsky.social · 05/02/2025
Shout out to @ucsandiego.bsky.social and @scrippsocean.bsky.social for keeping this going right now! keelingcurve.ucsd.edu
keelingcurve.ucsd.edu
The Keeling Curve
The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.
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Fisheries Conservation Foundation @fishconserve.bsky.social · 29/01/2025
🙁 Removal of more than 250 endangered southern steelhead trout took place last Thursday at Topanga Creek in a rescue operation led by the California Department of Fish and Wildlife.
buff.ly
Hundreds of endangered fish rescued from bodies of water damaged by L.A. fires
Hundreds of endangered fish were removed last week from bodies of water left damaged by the Palisades Fire. A removal of more than 250 endangered southern steelhead trout took place last Thursday a…
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Matthew L. Miller @matthewlmiller.bsky.social · 24/01/2025
There are as many as 7 species of redeye bass swimming southeast US streams. Redeye fly fishing is similar to small-stream trout: beautiful streams, surface action, small but striking fish. I've caught 5 redeye bass species & hope to return for Warrior & Cahaba bass this year. #flyfishing
Bartram's bass, one of 7 redeye bass varieties, caught in South Carolina.Fishing for Tallapoosa bass in a typical redeye bass stream in Georgia.Fly fishing among the shoal lilies for Bartram's bass.Coosa bass, caught in a small stream in Alabama. Redeye bass are not large bass, but I love the places you find them and their explosive takes of surface poppers.
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Marc Alessi @marc-alessi.bsky.social · 13/01/2025
Never forget that Exxon built their own climate model in the 1970s that correctly predicted climate change from the burning of fossil fuels
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freshwater fELA 🇨🇦 @not-klaatu.bsky.social · 10/01/2025
The future is #catostomidae... firmly believe that if there's a sentinel species that can tell us about enironmental changes, this group of fishes is it. Widely distributed, rarely targeted by anglers (and therefore don't need to worry about fishing mortality), and, I mean, just look at that face
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Harkness Laboratory of Fisheries Research @harknesslab.bsky.social · 10/01/2025
Yes. Agree. Catostomids are important in many aquatic ecosystems. Abundant and functionally unique.
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Trent Centre for Communicating Conservation @trentconservation.bsky.social · 09/01/2025
We're back in February for more conservation science! Join Dr. Mark Ridgway for the scoop on Algonquin Park lake fish. There's more going on beneath the waters than we thought!
A poster for our pub talk Islands of Water in a Sea of Land: Newly Discovered Species Diversity of Fish in Algonquin Park. Feb 11, 7:30 pm, the Publican. Dr. Mark Ridgway is pictured holding up a 2 foot fish with blue lakewater stretching out in the background
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Erin Stewart @erinmcstewart.bsky.social · 08/01/2025
📣 Just published in @conphysjournal.bsky.social with @jacobbowman.bsky.social, Chris Wilson, and Graham Raby How much does upper thermal tolerance vary among wild populations of brook trout? What drives this variation? 🌡️ 🧵1/5 doi.org/10.1093/conp...
doi.org
Local conditions drive interpopulation variation in field-based critical thermal maximum of brook trout
Abstract. Individual- and population-level responses to thermal change will be pivotal for species’ resilience and adaptive responses to climate change. Th
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7th International Conference on Fish Telemetry @icft2025.bsky.social · 06/01/2025
A friendly reminder that abstracts for ICFT 2025 are due at the end of the month! See the conference website for details. We want to be able to provide a quick turn around of abstract acceptance before registration begins!
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