I remember watching a documentary about the invasive red swamp crayfish in Berlin and how a company was supplying them whole to the restaurant trade. Maybe these calico crayfish on the Rhine could be, at least partially, dealt with this way. youtu.be/HZWk7aqM3Tk?...

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!)🦞!

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...

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.

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

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

Something truly extraordinary. The remarkable rainforest Lamington Crayfish on its daily forest walk. Isn't nature remarkable!

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...

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.

Two of my main concluding slides in my presentation:

Pleased to have delivered a seminar on invasive crayfish to the MNR Lake Ontario Management Unit at the historic Glenora research station.

There are some recent nice papers on crayfish colors that may be relevant: doi.org/10.1093/jcbi... doi.org/10.1093/behe...

Rode Amerikaanse #rivierkreeft Red Swamp #Crayfish #nature #netherlands #photography #wildlife #natuur #fotografie #dutch #outdoors #hiking #canon #wildlifephotography

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...

No red swamp crayfish in Michigan, please and thank you buff.ly/t2Irb5v

Crayfish on a train. www.bluewin.ch/en/news/inte...

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?

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...

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!

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

Cambers bartoni in Coldwater River, Ontario. (video: P Hamr)

Unfortunately we have confirmed that the introduced and invasive White River crayfish 🦞 are present in the Severn Sound region and they continue to survive and reproduce. How far they will spread into Georgian Bay is anybody's guess !😱

Big Water Crayfish (C. robustus) burrowing in hard clay banks. First time I have seen this species do this but not really surprised (Rusty, N. clearwater and Virile 🦞 all can do it!).

Pelleted excavate at the entrance of a C. bartoni ovigerous female's burrow deep in stream gravel.

Shoreline damage by invasive White River crayfish in Port Severn

Sometimes we know a crayfish is at a site before we even begin sampling. In this case, the hairy claws of the pilose crayfish had washed up on the shore of a reservoir from molts or mortalities.

crayfish art study. i was going to draw an oc ref, but.... #oc #ocsky #originalcharacter #a70d #crustacean #invertebrate

Blue red swamp crayfish, Procambarus clarkii, are occasionally found in Spain, and are hastily identified as Procambarus alleni Below, a recent newspaper news reporting a blue crayfish, together with blue P. clarkii from the Guadalquivir marshes ... but maybe someday alleni will arrive (hope not)

4 of the 7 New Species of crayfish from Papua (doi.org/10.3390/arth...)

Still waiting for cormorant eggs to hatch. Here is an older photo of a cormorant tossing a crawdad/crayfish into its mouth after beating it against the water. A brutal end for the crustacean. #birds #cormorant #wildlife #nature #photography #protectnature #conservation

Some Spanish populations of signal crayfish, Pacifastacus leniusculus, have impressive prevalence and abundance of Xironogiton episimbiotic branchiobdellians (both of them from America) These are from the Lozoya River, near Madrid

Summer holiday BLOWOUT! Not one, not two, but SEVEN 7️⃣‼️ species of #crayfish new to science! 🆕🧪 And lead author Chris Lukhaup brings drop dead GORGEOUS photos of all of them! 📸 It's #OpenAccess, go look! 👀 doi.org/10.3390/arth...

Presenting the documentary evidence of the 16th introduction of the Italian crayfish, Austropotamobius fulcisianus, in Spain Now, many call it the native crayfish... risks of loosing the historical perspective In #EEI2025, with Alicia Sempere @ebdonana.bsky.social

Interesting article about Ontario Invasive 🦞by Sam Turner.

Did some Digger crayfish surveys north of Toronto

Unidentified organism on a dead big water crayfish (c. robustus). Anyone have any idea what tissue is?! (Posted on iNaturalist by R. Bailey)

Second edition is out with an accompanying poster!

Juvenile digger crayfish feeding on an (big!) earthworm (photo: S Turner on iNaturalist)

It's #InvasiveSpeciesWeek! Invasive non-native species #INNS are plants/animals introduced from other regions that disrupt our natural ecosystems and threaten native wildlife. They cost the UK economy nearly £2bn every year! 😱 Find out more www.northwaleswildlifetrust.org.uk/inns 📷 NWWT/NNSS

Better Alone Than in Bad Company: Trophic Ecology of Co‐Occurring Invasive and Native Crayfish Ecol&Evol