International Association of Astacology
@crayfishiaa.bsky.social
Devoted to the multidisciplenery study of freshwater crayfish on our planet.
Reposted by International Association of Astacology
Very rare bilateral colour mutation in a Rusty Crayfish from the Chagrin R. (photo by Sean Williams)
November 7, 2025 at 8:17 PM
Very rare bilateral colour mutation in a Rusty Crayfish from the Chagrin R. (photo by Sean Williams)
NEW Issue of Crayfish News is out! get it at our website (and become a member if you are not one already!)🦞!
November 12, 2025 at 9:29 PM
NEW Issue of Crayfish News is out! get it at our website (and become a member if you are not one already!)🦞!
Reposted by International Association of Astacology
Fears for endangered Tasmanian crayfish species after 'unauthorised' earthworks
Last year TEPA (EPA) quietly issued a stop-work notice to an industrial company over "unauthorised" and "extensive" damage to waterways housing the endangered giant freshwater crayfish.
www.abc.net.au/news/2025-10...
Last year TEPA (EPA) quietly issued a stop-work notice to an industrial company over "unauthorised" and "extensive" damage to waterways housing the endangered giant freshwater crayfish.
www.abc.net.au/news/2025-10...
Unauthorised land clearing impacted endangered crayfish, EPA finds
A creek in northern Tasmanian known to be home to the endangered giant freshwater crayfish has sustained "serious environmental harm" from land clearing and earthworks, the Environment Protection Agen...
www.abc.net.au
October 21, 2025 at 5:23 AM
Fears for endangered Tasmanian crayfish species after 'unauthorised' earthworks
Last year TEPA (EPA) quietly issued a stop-work notice to an industrial company over "unauthorised" and "extensive" damage to waterways housing the endangered giant freshwater crayfish.
www.abc.net.au/news/2025-10...
Last year TEPA (EPA) quietly issued a stop-work notice to an industrial company over "unauthorised" and "extensive" damage to waterways housing the endangered giant freshwater crayfish.
www.abc.net.au/news/2025-10...
IAA25 will have crayfish oral and poster presentations from around the world. Come get a taste of Louisiana with a crayfish boil, Cajun band, and airboat tours through the swamps. The IAA25 website with conference registration, hotel conference rate booking, and meeting information is coming soon
October 17, 2025 at 6:49 PM
IAA25 will have crayfish oral and poster presentations from around the world. Come get a taste of Louisiana with a crayfish boil, Cajun band, and airboat tours through the swamps. The IAA25 website with conference registration, hotel conference rate booking, and meeting information is coming soon
The International Association of Astacology's 25th International Symposium on Freshwater Crayfish will be held in New Orleans, Louisiana on 1-5 June 2026 at the Sheraton New Orleans Hotel.
October 17, 2025 at 6:46 PM
The International Association of Astacology's 25th International Symposium on Freshwater Crayfish will be held in New Orleans, Louisiana on 1-5 June 2026 at the Sheraton New Orleans Hotel.
Reposted by International Association of Astacology
Reposted by International Association of Astacology
We just sued to protect the Miami cave crayfish, a species under immediate threat from saltwater intrusion cause by sea-level rise, more frequent tidal flooding, and storms of increasing intensity.
By 2070, they may lose as much as half of all available habitat.
Learn more ➡️ bit.ly/4pU37dc
By 2070, they may lose as much as half of all available habitat.
Learn more ➡️ bit.ly/4pU37dc
September 30, 2025 at 9:02 PM
We just sued to protect the Miami cave crayfish, a species under immediate threat from saltwater intrusion cause by sea-level rise, more frequent tidal flooding, and storms of increasing intensity.
By 2070, they may lose as much as half of all available habitat.
Learn more ➡️ bit.ly/4pU37dc
By 2070, they may lose as much as half of all available habitat.
Learn more ➡️ bit.ly/4pU37dc
Reposted by International Association of Astacology
Spotlight: The Red Swamp Crayfish (Procambarus clarkii) 🦞
This crayfish is a major threat, known for damaging infrastructure with its burrows & carrying crayfish plague. The #GuardIAS project is tracking its spread.
Learn more: guardias.eu #InvasiveSpecies
This crayfish is a major threat, known for damaging infrastructure with its burrows & carrying crayfish plague. The #GuardIAS project is tracking its spread.
Learn more: guardias.eu #InvasiveSpecies
September 9, 2025 at 8:52 AM
Spotlight: The Red Swamp Crayfish (Procambarus clarkii) 🦞
This crayfish is a major threat, known for damaging infrastructure with its burrows & carrying crayfish plague. The #GuardIAS project is tracking its spread.
Learn more: guardias.eu #InvasiveSpecies
This crayfish is a major threat, known for damaging infrastructure with its burrows & carrying crayfish plague. The #GuardIAS project is tracking its spread.
Learn more: guardias.eu #InvasiveSpecies
Reposted by International Association of Astacology
Something truly extraordinary. The remarkable rainforest Lamington Crayfish on its daily forest walk. Isn't nature remarkable!
September 17, 2025 at 8:54 AM
Something truly extraordinary. The remarkable rainforest Lamington Crayfish on its daily forest walk. Isn't nature remarkable!
Reposted by International Association of Astacology
This is insane. Do you know how much people in Sweden pay for these during late summer crayfish season?
www.bbc.co.uk/news/article...
www.bbc.co.uk/news/article...
Thousands of invasive crayfish trapped in Belper river
The crayfish in Belper were handed over to the Environment Agency, which killed them by freezing.
www.bbc.co.uk
September 4, 2025 at 8:52 PM
This is insane. Do you know how much people in Sweden pay for these during late summer crayfish season?
www.bbc.co.uk/news/article...
www.bbc.co.uk/news/article...
Reposted by International Association of Astacology
No less than five species of invasive North American crayfish have made the Netherlands their home after they either escaped or were dumped into waterways here and elsewhere across the continent.
Crayfish crackdown: American invader on the Dutch menu - DutchNews.nl
As billions of invasive American crayfish continue damaging canals and other waterways around the country, the best of way of dealing with them may very well be to eat them, experts say. No less than…
www.dutchnews.nl
September 3, 2025 at 3:01 PM
No less than five species of invasive North American crayfish have made the Netherlands their home after they either escaped or were dumped into waterways here and elsewhere across the continent.
Reposted by International Association of Astacology
Reposted by International Association of Astacology
Two of my main concluding slides in my presentation:
August 22, 2025 at 1:21 PM
Two of my main concluding slides in my presentation:
Reposted by International Association of Astacology
Pleased to have delivered a seminar on invasive crayfish to the MNR Lake Ontario Management Unit at the historic Glenora research station.
August 22, 2025 at 1:20 PM
Pleased to have delivered a seminar on invasive crayfish to the MNR Lake Ontario Management Unit at the historic Glenora research station.
Reposted by International Association of Astacology
There are some recent nice papers on crayfish colors that may be relevant:
doi.org/10.1093/jcbi...
doi.org/10.1093/behe...
doi.org/10.1093/jcbi...
doi.org/10.1093/behe...
Prevalence and potential evolutionary significance of color variants in freshwater crayfishes (Decapoda: Astacidea)
Abstract. Mutations may lead to the evolution and diversification of color phenotypes in animals. Much of the research on this topic, however, has been con
doi.org
August 21, 2025 at 11:17 AM
There are some recent nice papers on crayfish colors that may be relevant:
doi.org/10.1093/jcbi...
doi.org/10.1093/behe...
doi.org/10.1093/jcbi...
doi.org/10.1093/behe...
Reposted by International Association of Astacology
Rode Amerikaanse #rivierkreeft
Red Swamp #Crayfish
#nature #netherlands #photography #wildlife #natuur #fotografie #dutch #outdoors #hiking #canon #wildlifephotography
Red Swamp #Crayfish
#nature #netherlands #photography #wildlife #natuur #fotografie #dutch #outdoors #hiking #canon #wildlifephotography
August 18, 2025 at 10:10 AM
Rode Amerikaanse #rivierkreeft
Red Swamp #Crayfish
#nature #netherlands #photography #wildlife #natuur #fotografie #dutch #outdoors #hiking #canon #wildlifephotography
Red Swamp #Crayfish
#nature #netherlands #photography #wildlife #natuur #fotografie #dutch #outdoors #hiking #canon #wildlifephotography
Reposted by International Association of Astacology
Undesirables! It was disappointing to come across several of the highly invasive, alien, Red Signal Crayfish (Pacifastacus leniusculus) in the River Bure below Aylesham yesterday. Seems the local Otters are at least keeping them in check, though...
August 19, 2025 at 5:07 PM
Undesirables! It was disappointing to come across several of the highly invasive, alien, Red Signal Crayfish (Pacifastacus leniusculus) in the River Bure below Aylesham yesterday. Seems the local Otters are at least keeping them in check, though...
The 25th Biennial Symposium of the International Association of Astacology (IAA) will be held in held in New Orleans, Louisiana (USA) June 1st – 5th 2026. Please visit the IAA website for Student Travel Awards application form, and other details on the awards: astacology.org/Meetings.asp...
IAA Symposia and Meetings
International Association of Astacology
astacology.org
August 18, 2025 at 4:59 PM
The 25th Biennial Symposium of the International Association of Astacology (IAA) will be held in held in New Orleans, Louisiana (USA) June 1st – 5th 2026. Please visit the IAA website for Student Travel Awards application form, and other details on the awards: astacology.org/Meetings.asp...
Reposted by International Association of Astacology
No red swamp crayfish in Michigan, please and thank you buff.ly/t2Irb5v
DNR staff found a red swamp crayfish in a fish rearing pond. Why that's a problem
DNR officials say they discovered both live and dead invasive crayfish at a state hatchery and are taking steps to track the infestation.
www.lansingstatejournal.com
July 31, 2025 at 8:51 PM
No red swamp crayfish in Michigan, please and thank you buff.ly/t2Irb5v
Reposted by International Association of Astacology
Crayfish on a train.
www.bluewin.ch/en/news/inte...
www.bluewin.ch/en/news/inte...
Free-roaming crayfish in Cologne suburban train cause police action
Free-roaming crayfish in a Cologne S-Bahn train have led to a police operation. During a stop at Cologne Central Station, officers found a garbage bag originally containing 21 live crustaceans.
www.bluewin.ch
August 1, 2025 at 7:17 AM
Crayfish on a train.
www.bluewin.ch/en/news/inte...
www.bluewin.ch/en/news/inte...
Reposted by International Association of Astacology
Reposted by International Association of Astacology
This summer, my lab is working to determine whether we can protect the rare, native pilose crayfish in Wyoming from the widely invasive virile crayfish. For example, do irrigation diversions work as barriers excluding virile from pilose habitat? So: what do we think of this prospective barrier?
July 22, 2025 at 10:15 PM
This summer, my lab is working to determine whether we can protect the rare, native pilose crayfish in Wyoming from the widely invasive virile crayfish. For example, do irrigation diversions work as barriers excluding virile from pilose habitat? So: what do we think of this prospective barrier?
Reposted by International Association of Astacology
Invasive red swamp crayfish found in pond at DNR's Wolf Lake State Fish Hatchery in Michigan - announcement from @michigandnr.bsky.social
content.govdelivery.com/accounts/MID...
content.govdelivery.com/accounts/MID...
Invasive red swamp crayfish found in pond at Wolf Lake State Fish Hatchery
content.govdelivery.com
July 24, 2025 at 3:35 PM
Invasive red swamp crayfish found in pond at DNR's Wolf Lake State Fish Hatchery in Michigan - announcement from @michigandnr.bsky.social
content.govdelivery.com/accounts/MID...
content.govdelivery.com/accounts/MID...
Reposted by International Association of Astacology
Blessed to find this beautiful electric blue Faxonius virilis while sampling the St. Lawrence for my doctoral work! This is a fairly rare phenotype for this native North American species!
July 29, 2025 at 12:17 AM
Blessed to find this beautiful electric blue Faxonius virilis while sampling the St. Lawrence for my doctoral work! This is a fairly rare phenotype for this native North American species!
Reposted by International Association of Astacology
This was the first potential barrier we checked this summer, and we immediately found a virile crayfish showing us some technique for climbing over the dam boards. Definitely not a barrier - virile crayfish abundant upstream of the diversion
July 23, 2025 at 1:31 AM
This was the first potential barrier we checked this summer, and we immediately found a virile crayfish showing us some technique for climbing over the dam boards. Definitely not a barrier - virile crayfish abundant upstream of the diversion