Joel Williams
@joelfishecology.bsky.social
Quantitative fish ecologist with a special interest in temperate mesophotic ecosystems and the Southern Ocean. Researching marine parks and fisheries.
Also a keen photographer.
Also a keen photographer.
Our latest research publish Global Change Biology:
Climate Change, Fisheries Management, and Increases in Demersal Fish Distribution in a Southern Ocean Biodiversity Hotspot
🔗 buff.ly/crdNBVi
@joelfishecology.bsky.social
🔗 buff.ly/crdNBVi
@joelfishecology.bsky.social
November 14, 2025 at 1:40 AM
Our latest research publish Global Change Biology:
Great to the Voyis camera system attached to an ROV in action today. When attached to an ROV, this camera system helps build amazing 3D models of reef and structures. Very impressive technology in action!
November 12, 2025 at 8:12 AM
Great to the Voyis camera system attached to an ROV in action today. When attached to an ROV, this camera system helps build amazing 3D models of reef and structures. Very impressive technology in action!
Reposted by Joel Williams
🧪🦤🌐
The herbivorous sea urchin Centrostephanus rodgersii removes macroalgae & creates barrens. Understanding density-dependent processes governing its abundance will assist with addressing the challenges it poses in some jurisdictions in south-eastern Australia.
bit.ly/meps_771_55
The herbivorous sea urchin Centrostephanus rodgersii removes macroalgae & creates barrens. Understanding density-dependent processes governing its abundance will assist with addressing the challenges it poses in some jurisdictions in south-eastern Australia.
bit.ly/meps_771_55
October 23, 2025 at 12:24 PM
🧪🦤🌐
The herbivorous sea urchin Centrostephanus rodgersii removes macroalgae & creates barrens. Understanding density-dependent processes governing its abundance will assist with addressing the challenges it poses in some jurisdictions in south-eastern Australia.
bit.ly/meps_771_55
The herbivorous sea urchin Centrostephanus rodgersii removes macroalgae & creates barrens. Understanding density-dependent processes governing its abundance will assist with addressing the challenges it poses in some jurisdictions in south-eastern Australia.
bit.ly/meps_771_55
Today we had the black cockatoos visit us. They come down from the mountains over winter to feed in coastal areas. They were living the proteas!
October 23, 2025 at 10:50 AM
Today we had the black cockatoos visit us. They come down from the mountains over winter to feed in coastal areas. They were living the proteas!
Reposted by Joel Williams
🚨Our new package {galaxias} is released in R & Python today! 🚨
📦 galaxias makes it easy to standardise data to Darwin Core, the accepted format for sharing ecological data with infrastructures like @gbif.org and the Atlas of Living Australia
galaxias.ala.org.au
#rstats #python 🧪🌏🐟
A thread 🧵👇
📦 galaxias makes it easy to standardise data to Darwin Core, the accepted format for sharing ecological data with infrastructures like @gbif.org and the Atlas of Living Australia
galaxias.ala.org.au
#rstats #python 🧪🌏🐟
A thread 🧵👇
October 23, 2025 at 2:41 AM
🚨Our new package {galaxias} is released in R & Python today! 🚨
📦 galaxias makes it easy to standardise data to Darwin Core, the accepted format for sharing ecological data with infrastructures like @gbif.org and the Atlas of Living Australia
galaxias.ala.org.au
#rstats #python 🧪🌏🐟
A thread 🧵👇
📦 galaxias makes it easy to standardise data to Darwin Core, the accepted format for sharing ecological data with infrastructures like @gbif.org and the Atlas of Living Australia
galaxias.ala.org.au
#rstats #python 🧪🌏🐟
A thread 🧵👇
Our latest research published in @GlobalChangeBio demonstrates how the demersal fish assemblage in the Heard Island and McDonald Islands (HIMI) region has vastly increased in occurrence, abundance, and species richness. over the past 2 decades.
doi.org/10.1111/gcb....
doi.org/10.1111/gcb....
Climate Change, Fisheries Management, and Increases in Demersal Fish Distribution in a Southern Ocean Biodiversity Hotspot
This study investigates long-term changes in demersal fish on the Kerguelen Plateau, a biodiversity and climate change hotspot. Using scientific trawl surveys and joint species distribution models, r....
doi.org
October 22, 2025 at 1:05 AM
Our latest research published in @GlobalChangeBio demonstrates how the demersal fish assemblage in the Heard Island and McDonald Islands (HIMI) region has vastly increased in occurrence, abundance, and species richness. over the past 2 decades.
doi.org/10.1111/gcb....
doi.org/10.1111/gcb....
Whoops… the importance of sea floor mapping!
www.abc.net.au/news/2025-10...
www.abc.net.au/news/2025-10...
Breaking: Australia's Antarctic icebreaker scrapes ocean floor near Heard Island
Antarctic icebreaker RSV Nuyina has headed to deeper waters off remote Heard Island in the Southern Ocean while assessments are undertaken to see if the hull has suffered any damage after scraping the...
www.abc.net.au
October 14, 2025 at 4:01 AM
Whoops… the importance of sea floor mapping!
www.abc.net.au/news/2025-10...
www.abc.net.au/news/2025-10...
Reposted by Joel Williams
A research team led by scientists from our University has returned from a major 54-day voyage on CSIRO research vessel (RV) Investigator to explore the impacts of the devastating 2022 eruption of Tonga's underwater Hunga Volcano.
Read about what they've discovered: utas.au/Hunga_Voyage
Read about what they've discovered: utas.au/Hunga_Voyage
Scientists return with clues to uncover what led to the ‘eruption of the century’
utas.au
October 6, 2025 at 10:37 PM
A research team led by scientists from our University has returned from a major 54-day voyage on CSIRO research vessel (RV) Investigator to explore the impacts of the devastating 2022 eruption of Tonga's underwater Hunga Volcano.
Read about what they've discovered: utas.au/Hunga_Voyage
Read about what they've discovered: utas.au/Hunga_Voyage
Reposted by Joel Williams
Have a question about scientific publishing? @hbrowman.bsky.social and the editorial board of ICES Journal are here to help early-career scientists navigate the the many challenges of publishing today 📝
September 16, 2025 at 9:25 AM
Have a question about scientific publishing? @hbrowman.bsky.social and the editorial board of ICES Journal are here to help early-career scientists navigate the the many challenges of publishing today 📝
On the tools! Piloting the ROV over some great mesophotic reef in the Commonwealth Solitary Islands Marine Park. We are doing 200m transects and some exploratory surveys.
September 6, 2025 at 11:02 AM
On the tools! Piloting the ROV over some great mesophotic reef in the Commonwealth Solitary Islands Marine Park. We are doing 200m transects and some exploratory surveys.
Another day another round Of BRUV and ROV surveys in the Solitsry Islabds Marine Park! Dropped the BlueROV on some seriously awesome temperate mesophotic reefs! Black corals, octocorals, giant sponges! And of course some big fish!
#mesophotic #marineparks #rov #bruv
#mesophotic #marineparks #rov #bruv
September 3, 2025 at 5:03 AM
Another day another round Of BRUV and ROV surveys in the Solitsry Islabds Marine Park! Dropped the BlueROV on some seriously awesome temperate mesophotic reefs! Black corals, octocorals, giant sponges! And of course some big fish!
#mesophotic #marineparks #rov #bruv
#mesophotic #marineparks #rov #bruv
Gumbaynggirr Rangers in action! BRUVing mesophotic reefs in the Solitary Islands Marine Park (Commonwealth) mapping fish and habitat.
September 2, 2025 at 5:59 AM
Gumbaynggirr Rangers in action! BRUVing mesophotic reefs in the Solitary Islands Marine Park (Commonwealth) mapping fish and habitat.
We’re off to Coffs to survey the mesophotic reefs of the Solitary Islands Marine Park. This work is for an Our Marine Parks grant in partnership with Ngiyambandigay Wajaarr Aboriginal Corporation. Stay tuned for updates through the week!
@utas.edu.au
@utas.edu.au
August 31, 2025 at 12:36 AM
We’re off to Coffs to survey the mesophotic reefs of the Solitary Islands Marine Park. This work is for an Our Marine Parks grant in partnership with Ngiyambandigay Wajaarr Aboriginal Corporation. Stay tuned for updates through the week!
@utas.edu.au
@utas.edu.au
Who remembers the Mathomat!! It’s been 30 years since this has been used but I need a protractor!!
August 22, 2025 at 4:24 AM
Who remembers the Mathomat!! It’s been 30 years since this has been used but I need a protractor!!
Last week I had the pleasure and honour to participate in a IUCN Red List workshop to assess Australia and New Zealand fishes! I learnt a lot through out the week. Including learning about this mesophotic only Bigeye Gurnard Perch!! Thanks everyone for a great week!
@aciucn.bsky.social
@aciucn.bsky.social
August 15, 2025 at 2:30 AM
Last week I had the pleasure and honour to participate in a IUCN Red List workshop to assess Australia and New Zealand fishes! I learnt a lot through out the week. Including learning about this mesophotic only Bigeye Gurnard Perch!! Thanks everyone for a great week!
@aciucn.bsky.social
@aciucn.bsky.social
Once classified as extinct in the wild, these tiny marsupials are running free on three islands.
Technically, not extinct in the wild, there is a Tasmanian population. We have them living in our backyard!
www.theage.com.au/environment/...
Technically, not extinct in the wild, there is a Tasmanian population. We have them living in our backyard!
www.theage.com.au/environment/...
Once classified as extinct in the wild, these tiny marsupials are running free on three islands
In 1989, rescue workers scooped the last known colony of wild eastern barred bandicoots out of the tip and into the protective custody of a breeding program.
www.theage.com.au
August 15, 2025 at 2:19 AM
Once classified as extinct in the wild, these tiny marsupials are running free on three islands.
Technically, not extinct in the wild, there is a Tasmanian population. We have them living in our backyard!
www.theage.com.au/environment/...
Technically, not extinct in the wild, there is a Tasmanian population. We have them living in our backyard!
www.theage.com.au/environment/...
Flashback to my 4th PhD chapter. While this was a classic 4th chapter, this goes down as one of my most interesting papers! Taking a multi-elemental approach to larval fish otolith microchemistry can distinguish location of larvae in the water column
aslopubs.onlinelibrary.wiley.com/doi/full/10....
aslopubs.onlinelibrary.wiley.com/doi/full/10....
Fine‐scale variability in elemental composition of estuarine water and otoliths: Developing environmental markers for determining larval fish dispersal histories within estuaries
Otolith chemistry has been widely used as a natural tag for determining environmental histories of fish that migrate across large distances and environmental gradients. However, it is not as well est...
aslopubs.onlinelibrary.wiley.com
July 2, 2025 at 10:54 AM
Flashback to my 4th PhD chapter. While this was a classic 4th chapter, this goes down as one of my most interesting papers! Taking a multi-elemental approach to larval fish otolith microchemistry can distinguish location of larvae in the water column
aslopubs.onlinelibrary.wiley.com/doi/full/10....
aslopubs.onlinelibrary.wiley.com/doi/full/10....
Reposted by Joel Williams
New paper out! We found that a climate change-driven warming off Sydney has increased the amount of time bull sharks spend around Australia's biggest city. #sharks #climatechange #sydney #bullsharks
@jcuofficial.bsky.social @drrossdwyer.bsky.social @imos-aus.bsky.social @saveourseas.bsky.social
@jcuofficial.bsky.social @drrossdwyer.bsky.social @imos-aus.bsky.social @saveourseas.bsky.social
June 26, 2025 at 3:18 AM
New paper out! We found that a climate change-driven warming off Sydney has increased the amount of time bull sharks spend around Australia's biggest city. #sharks #climatechange #sydney #bullsharks
@jcuofficial.bsky.social @drrossdwyer.bsky.social @imos-aus.bsky.social @saveourseas.bsky.social
@jcuofficial.bsky.social @drrossdwyer.bsky.social @imos-aus.bsky.social @saveourseas.bsky.social
Reposted by Joel Williams
June 26, 2025 at 10:44 AM
On my first dive in Tassie I noticed a nudibranch that seemed like it was out of place, like it should have been in Port Stephens. After spreading the word, this nudi started popping up across eastern Tassie. This is a really interesting range extension!
link.springer.com/article/10.1...
link.springer.com/article/10.1...
Unsolicited nudis: ongoing spread of two non-native nudibranchs along Australia’s east coast - Biological Invasions
Nudibranchs are a charismatic and widely distributed group of marine invertebrates that can be useful biological indicators of ocean change, thanks to their responsiveness and dispersal ability. Howev...
link.springer.com
June 26, 2025 at 6:08 AM
On my first dive in Tassie I noticed a nudibranch that seemed like it was out of place, like it should have been in Port Stephens. After spreading the word, this nudi started popping up across eastern Tassie. This is a really interesting range extension!
link.springer.com/article/10.1...
link.springer.com/article/10.1...
Our latest paper is available as a preprint: Changes in demersal fish assemblages of the Kerguelen Plateau in relation to climate change and fisheries practices. Using a joint species distribution modeling approach.
Climate Change, Fisheries Management, and Increases in Demersal Fish Distribution in a Southern Ocean Biodiversity Hotspot https://www.biorxiv.org/content/10.1101/2025.05.27.656478v1
June 22, 2025 at 9:30 AM
Our latest paper is available as a preprint: Changes in demersal fish assemblages of the Kerguelen Plateau in relation to climate change and fisheries practices. Using a joint species distribution modeling approach.
Great work @utas.edu.au leading the world on climate change. It is a privilege to be able to contribute to this.
We're number 1 in the world for Climate Action for the 4th year in a row 🤩🌏
The @timeshighered.bsky.social Impact Rankings rank 2526 universities based on their progress towards the UN’s Sustainable Development Goals (SDGs).
We are proud of all the people at our University who made this possible.
The @timeshighered.bsky.social Impact Rankings rank 2526 universities based on their progress towards the UN’s Sustainable Development Goals (SDGs).
We are proud of all the people at our University who made this possible.
June 18, 2025 at 2:19 AM
Great work @utas.edu.au leading the world on climate change. It is a privilege to be able to contribute to this.