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Ignasi Nuez, Dr.

@ignasinr14.bsky.social
1.7K followers 126 following 26 posts

Shark scientist. Looking into the biological & ecological traits of sharks and their interactions with fisheries. Strong focus on bluntnose sixgill sharks in the Mediterranean Sea. At @ub.edu @marinemegafauna.bsky.social

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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 02/03/2026
From sixgills to baskings! Our new #maximus_SHARK project is up and running, and we're visiting the Catalan fishing guilds to start a new collaboration with their fishermen. Together, we'll try to broaden the ecological knowledge of this species in the NW Mediterranean. @manelgazo.bsky.social
There's some merch too :)
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Reposted by Ignasi Nuez, Dr.
Convention on Migratory Species (CMS) @cms.int · 26/02/2026
New maps reveal the scale of #saiga migrations across #Kazakhstan and the threats they face. They highlight key migration routes and show how roads, railways and infrastructure can fragment habitat and disrupt movements. Explore the interactive maps & fact sheets: cami.cms.int/news/new-map...
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 12/12/2025
Killer whales and dolphins have been recorded working together to hunt salmon :) www.theguardian.com/environment/...
theguardian.com
Orcas team up with dolphins to hunt salmon, study finds
Northern resident killer whales appear to use dolphins as ‘scouts’, in a surprising cooperative hunting strategy
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 28/11/2025
The latest #FAO #SoMFi report shows we're steadily getting to an overall more sustainable framework of #resource exploitation. Room for improvement (e.g 28% women workforce, some important fish stocks yet to reach their MSy) but results tell us we're on the right track.
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IUCN SSC Shark Specialist Group @iucnshark.bsky.social · 28/11/2025
Just an hour ago at the CITES #CoP20 all Mantas and Devil Rays (Mobulidae spp.) were accepted by consensus to uplist from Appendix II to Appendix I! Follow along for more updates live. #CITESCoP20 #mobulids #manta #devilrays #shark #ray #chimaera #biodiversity #conservation #trade #conference
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Wildlife Conservation Society @wcs.org · 27/11/2025
Historic victory for sharks: #CITESCoP20 Parties voted to list oceanic whitetip sharks on Appendix I, the highest level of protection offered by CITES. “Today’s decision is a watershed moment for all sharks and rays,” said WCS’s Luke Warwick. 🌏 Read more: bit.ly/4olha9w
newsroom.wcs.org
Historic Victory for Sharks as Oceanic Whitetips Upgraded to Appendix I at CITES Banning International Trade
Samarkand, Uzbekistan, Nov. 27, 2025 – CITES CoP20 Parties voted to list oceanic whitetip sharks on Appendix I, the highest level of protection offered by CITES. The vote marks a major victory for one...
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 04/08/2025
Our new research paper is out. We found microplastic ingestion by the blackmouth catshark (Galeus melastomus) in the canyoned continental margins of the Gulf of Lion was high, more than in other parts of the Mediterranean and was influenced by the role of those canyoned margins. Full thread 👇🏻🦈
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Dr Vincent Raoult @sawsharkman.bsky.social · 02/08/2025
Cutting teeth probably let smaller sharks get higher in the food web than those with grasping teeth. Awesome stable isotope study led by fabulous PhD graduate Sabrina Riveron! @griffith.edu.au onlinelibrary.wiley.com/doi/10.1002/...
onlinelibrary.wiley.com
Shearing Tooth Morphology May Allow Sharks to Access Higher Trophic Levels at Smaller Sizes
Predator morphology imposes limitations on prey selection due to biomechanical constraints, making some prey functionally inaccessible and thereby constraining predator trophic niches. We assessed ho....
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 25/07/2025
The #Bocadolça project has been carried out at the Faculty of Biology from the University of Barcelona, Institut de Recerca de la Biodiversitat (IRBio_UB), and has been supported by the Fundació Zoo de Barcelona and the Barcelona City Council. Illustrated version of the protocol: Vanessa Rovira.
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 25/07/2025
Additionally, we’ve also set up a handling protocol for individuals that are caught by trawl and trammel nets to minimise their at-vessel and post-release mortality. This protocol has been designed in collab with the fishermen and an illustrated version has been created to be used on board. (2/3)
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 25/07/2025
We’ve recently finished our #Bocadolça project, the main aim of which was to determine presence and seasonality of the bluntnose sixgill shark (Hexanchus griseus) in the deep waters off Catalonia (NW Mediterranean). @manelgazo.bsky.social (1/3)
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Lachlan Fetterplace @fiskeforbrains.bsky.social · 09/05/2025
Breaking barriers: Transoceanic movement by a bull shark 🌊 🧪 🦑 doi.org/10.1002/ecy....
Panel figure from the paper showing a map on the right with shark movement track and detection locations - the figure caption says: "On 11 July 2024, a fisherman from Lagos, Nigeria, reported capturing (a) a female bull shark with (b) an internal acoustic transmitter (ID 6510). The shark was originally tagged on 2 April 2021 at the St Lucia Estuary mouth on the east coast of South Africa (c). The tagged shark recorded 541 detections on 20 receivers in southern Mozambique and South Africa before it was last detected in Mossel Bay on 25 March 2022 before being reported captured off the coast of Nigeria. Photo credit: Mr. Akeem Kolawole."
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 11/04/2025
Hey Johann. We’ve talked to the fishermen and we do have a few nore details. Any email address we could reach out to so we can share the info?
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 11/04/2025
(Photos: unknown)
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 11/04/2025
Yesterday, an unfortunate 7m-long basking shark (Cetorhinus maximus) was caught by trammel nets in Port de la Selva (NE Spain), close to shore. Sightings of this species start to be more frequent along the Catalan Coast at this time of the year, likely driven by ++[phytoplankton] in the region.
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Nature Communications @natcomms.nature.com · 02/04/2025
New study shows that #SouthernOcean #warming plays a greater role than #Arctic Ocean warming in shifting tropical #rainfall in a future climate, increasing rainfall in #Brazil and enhancing #drought risk in the #Sahel. www.nature.com/articles/s41...
nature.com
The greater role of Southern Ocean warming compared to Arctic Ocean warming in shifting future tropical rainfall patterns - Nature Communications
This study uses climate models and shows that Southern Ocean warming plays a greater role than Arctic Ocean warming in shifting tropical rainfall in a future climate, increasing rainfall in Brazil and...
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SharkScience @sharkscience.bsky.social · 21/03/2025
Cognitive perception of circulating oxygen in seals is the reason they don’t drown 🦑🌎🧪🦭 www.science.org/doi/10.1126/...
science.org
Cognitive perception of circulating oxygen in seals is the reason they don’t drown
Marine mammals rely on maintaining sufficient blood oxygen levels while diving to prevent drowning. Generally, oxygen is cognitively imperceptible to mammals that instead sense rising carbon dioxide a...
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 07/03/2025
So cool! Tagged four sixgills in the Med this year, 3 tags popped up and we got really close to getting one back but it finally drifted too far away…
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Dr Vincent Raoult @sawsharkman.bsky.social · 01/03/2025
Important paper shows white shark reproductive population in eastern Australia might be as few as 500 adults... challenges the idea that shark populations are "exploding" onlinelibrary.wiley.com/doi/pdf/10.1...
onlinelibrary.wiley.com
Genomic Assessment of Australian White Sharks (Carcharodon carcharias) Challenges Previous Evidence of Population Subdivision
Aim The white shark (Carcharodon carcharias) is one of the world's largest and most recognisable marine predators but has suffered significant declines since the mid-twentieth century. Conservation ...
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 30/12/2024
Hola @antiguaroma.com Gracias por este hilo! Ahora que mencionas a Domiciano, si un dia lo consideras apropiado, un post sobre tu opinión acerca de su figura podria ser muy interesante. Esa fama de paranoico…hasta que punto es cierta?
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 30/12/2024
Though we still need to work on proper reporting of discards, the study concludes sharks and rays represent little to no revenue for Mediterranean fleets.
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 30/12/2024
New research by Colloca et al. found that the average contribution of elasmobranchs to the total annual landings of EU fisheries operating in the Mediterranean Sea from 2013 to 2022 was, in economic value... 0.60%. link.springer.com/article/10.1...
link.springer.com
Assessing the relevance of sharks and rays for Mediterranean EU fisheries to support a transition from species exploitation to species conservation - Reviews in Fish Biology and Fisheries
Ten years (2013–2022) of official data on elasmobranchs landed and discarded by European fishing fleets operating in the Mediterranean Sea were analysed with the primary objective of assessing the sig...
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Madhu Pai, MD, PhD @madhupai.bsky.social · 21/12/2024
Lots to learn from Rwanda www.telegraph.co.uk/global-healt...
telegraph.co.uk
Rwanda’s Marburg response is a masterclass in how to prevent pandemics
Today marks the official end of the outbreak. Swift action saved many lives and helped protect the rest of the world from potential disaster
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Manel Gazo @manelgazo.bsky.social · 13/12/2024
To set up a protocol for the release of accidentally captured bluntnose sixgill sharks 🦈…. the key is to listen and learn from the experts. A huge thank you for your time and knowledge, skippers! Projecte #Bocadolça @marinemegafauna.bsky.social @irbio-ub.bsky.social @ub.edu @ignasinr14.bsky.social
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 12/12/2024
Oh no.
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Nick Dulvy @nickdulvy.bsky.social · 05/12/2024
The wave of rising shark & ray extinction risk #GlobalSharkTrends 👉 started in rivers, estuaries, nearshore coastal waters 👉 before rapidly expanding out across the oceans. Lower risk only in harder-to-fish nearshore habitats, ie, 👉 Kelp/algal reefs 👉 Rocky reefs, & 👉 Deepsea 🧵10/20
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IUCN SSC Shark Specialist Group @iucnshark.bsky.social · 02/12/2024
BREAKING: The IUCN Species Survival Commission Shark Specialist Group has released a new report on the global conservation status of sharks and their relatives. portals.iucn.org/library/node...
Cover of the new "global status of sharks, rays, and chimaeras" report
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 28/11/2024
Really nice paper guys!
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Lilian Lieber @lilianlieber.bsky.social · 26/11/2024
No idea who to follow? 🧪🌊🦑 Try these starter packs & Follow All or some: Marine Ecology: go.bsky.app/4PTX62K Ocean Technology: go.bsky.app/VgpFR6B Shark scientists : go.bsky.app/Q1x1gJB Ocean Women: go.bsky.app/7MdiLgo Ocean Women II: go.bsky.app/4wMsfX4 Plankton Ecology: go.bsky.app/8fAUg8j
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 26/11/2024
Nice! How long is an adult S.corona?
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 25/11/2024
And now the fun bit. To any of the authors, if you ever read this: I was there in summer 2014 with the OR team as an intern. Got to take part in your experiment for a couple days and it was fun to finally read the results. I even have my own "Figure 1A" :D
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 25/11/2024
New research found white sharks reduced a lot their interactions with counterilluminated seal decoys vs control decoys. www.sciencedirect.com/science/arti...
sciencedirect.com
Counterillumination reduces bites by Great White sharks
In the open ocean, achieving camouflage is complicated by the fact that the downwelling light is generally much brighter than the upwelling light, whi…
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 23/11/2024
Wow, did not see that one coming. Not an expert on skate behaviour but I’m also inclined to believe some sort of stimulus (e.g bait) may have triggered the skate’s response…Or maybe they are the local thugs and that’s the end of this debate.
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 20/11/2024
Nice one, David. Can I be in too? (Sharks in the Mediterranean)
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 20/11/2024
Hey Dezene. Could you please add me in? Working on shark ecology and conservation, mainly in the Mediterranean Sea.
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 19/11/2024
Japan and China once again blocking consensus. www.sharkleague.org/2024/11/18/u...
sharkleague.org
Unprecedented International Effort to Prevent Shark Finning Blocked by Japan & China - Shark League for the Atlantic and Mediterranean
ICCAT meeting ends in dramatic defeat of proposal to end at-sea fin removal while other shark safeguards advance Limassol, Cyprus. November 18, 2024. This year’s meeting of the International Commissio...
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 18/11/2024
Hey David. Could you please add me too?
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Colin Simpfendorfer @sharkcolin.bsky.social · 15/11/2024
A few interesting papers out lately on human-shark interactions: Reducing fisher-shark conflict link.springer.com/article/10.1... Counterillumination reduces bites www.cell.com/current-biol... Do individual sharks bite humans more than once? conbio.onlinelibrary.wiley.com/doi/pdf/10.1... #shark
Large bull shark swimming in Fiji waters
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 14/11/2024
Salve!
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Ignasi Nuez, Dr. @ignasinr14.bsky.social · 14/11/2024
Hello there, folks. Looks like Bluesky is here to get us all back on the right track. Well then, I’m up for that too. I’ll be mostly posting about shark research and conservation and, quite frequently, about these guys (Hexanchus griseus) in the Mediterranean. See you around!
The bluntnose sixgill shark is a common bycatch species in deep-water gearsEffective handling techniques are needed to minimise on-board mortality, and collaborating with the fishing community is of paramount importance. We’re working on it.(C) Kelvin Aitken
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