Nick Dulvy
@nickdulvy.bsky.social
I lift the lid on the oceans & census the life hidden beneath by combining Darwin’s toolbox–of natural history field guides, thermometer, microscope, and dissection kit–with big-data approaches @earth2ocean.bsky.social
So excited to see some cownose rays (alive) after 3 weeks of museum work. Nice welcome to European Elasmobranch Association meeting #Elasmo25 here with @rachhson.bsky.social @amandasodysseys.bsky.social
October 29, 2025 at 9:02 AM
So excited to see some cownose rays (alive) after 3 weeks of museum work. Nice welcome to European Elasmobranch Association meeting #Elasmo25 here with @rachhson.bsky.social @amandasodysseys.bsky.social
Guitarfish Tuesday in Paris
#MetabolicMorphology #SharksNearMe #DulvyLabGoesOutside #LoveMuseums #RaysNeedLoveToo #Paris #Brusselles #HamburgNaturalHistoryMuseum #NaturalHistoryMuseumDeParis
#MetabolicMorphology #SharksNearMe #DulvyLabGoesOutside #LoveMuseums #RaysNeedLoveToo #Paris #Brusselles #HamburgNaturalHistoryMuseum #NaturalHistoryMuseumDeParis
October 14, 2025 at 7:51 PM
Day 1 in Museum du Naturalle Histoire du Paris
#MetabolicMorphology #SharksNearMe #DulvyLabGoesOutside #LoveMuseums #RaysNeedLoveToo #Paris #Brusselles #HamburgNaturalHistoryMuseum #NaturalHistoryMuseumDeParis
#MetabolicMorphology #SharksNearMe #DulvyLabGoesOutside #LoveMuseums #RaysNeedLoveToo #Paris #Brusselles #HamburgNaturalHistoryMuseum #NaturalHistoryMuseumDeParis
October 13, 2025 at 6:14 PM
Day 1 in Museum du Naturalle Histoire du Paris
#MetabolicMorphology #SharksNearMe #DulvyLabGoesOutside #LoveMuseums #RaysNeedLoveToo #Paris #Brusselles #HamburgNaturalHistoryMuseum #NaturalHistoryMuseumDeParis
#MetabolicMorphology #SharksNearMe #DulvyLabGoesOutside #LoveMuseums #RaysNeedLoveToo #Paris #Brusselles #HamburgNaturalHistoryMuseum #NaturalHistoryMuseumDeParis
@elliedolan.bsky.social gives talk on experimental evidence for how various barriers and weirs influence salmon parr behaviour and likelihood of crossing #FSBI2025
July 8, 2025 at 2:14 PM
@elliedolan.bsky.social gives talk on experimental evidence for how various barriers and weirs influence salmon parr behaviour and likelihood of crossing #FSBI2025
Here we are in snowy Vancouver contemplating spatial management for sharks, rays & chimaeras along pacific coast
February 4, 2025 at 8:40 PM
Here we are in snowy Vancouver contemplating spatial management for sharks, rays & chimaeras along pacific coast
Hard at work understanding role of trade in driving fisheries risk @ucsb-nceas.bsky.social with side dishes of lawn bowls, surf 🏄 & CrossFit 🏋️♀️
January 30, 2025 at 4:50 AM
Hard at work understanding role of trade in driving fisheries risk @ucsb-nceas.bsky.social with side dishes of lawn bowls, surf 🏄 & CrossFit 🏋️♀️
Thanks to @redlipblenny.bsky.social for updating the corridor pictures of lab and fieldwork @sfuscience.bsky.social
January 21, 2025 at 9:49 PM
Thanks to @redlipblenny.bsky.social for updating the corridor pictures of lab and fieldwork @sfuscience.bsky.social
Sun breaking through to show off snowy mountains on way to lecture @sfuscience.bsky.social
January 21, 2025 at 7:31 PM
Sun breaking through to show off snowy mountains on way to lecture @sfuscience.bsky.social
The '90s wasn't all bad. Some of the papers in this hard-to-find Symposium volume presaged much of what a lot of use work on today. I still think about how to test the Branstetter theory that shark offspring size is driven by predation risk.
#SharkScience
#SharkScience
December 12, 2024 at 7:25 PM
The '90s wasn't all bad. Some of the papers in this hard-to-find Symposium volume presaged much of what a lot of use work on today. I still think about how to test the Branstetter theory that shark offspring size is driven by predation risk.
#SharkScience
#SharkScience
We urge the adoption of the Shark & Ray Red List Index to track progress on ocean conservation goals, like the Global Biodiversity Framework Target 5 & SDG 14.4. Accountability is key for preserving marine life!
🧵20/20
#GlobalGoals #UNGA #SDG
#SustainableDevelopmentGoals #SDG
Please like & repost
🧵20/20
#GlobalGoals #UNGA #SDG
#SustainableDevelopmentGoals #SDG
Please like & repost
December 5, 2024 at 10:05 PM
We urge the adoption of the Shark & Ray Red List Index to track progress on ocean conservation goals, like the Global Biodiversity Framework Target 5 & SDG 14.4. Accountability is key for preserving marine life!
🧵20/20
#GlobalGoals #UNGA #SDG
#SustainableDevelopmentGoals #SDG
Please like & repost
🧵20/20
#GlobalGoals #UNGA #SDG
#SustainableDevelopmentGoals #SDG
Please like & repost
The decline and loss of sharks & rays is a key example of how overfishing is eroding marine biodiversity. Stronger fisheries management is needed to ensure ocean biodiversity & socioeconomic sustainability.
@iucnshark.bsky.social @sscmarine.bsky.social
#OceanOptimism
🧵19/20
@iucnshark.bsky.social @sscmarine.bsky.social
#OceanOptimism
🧵19/20
December 5, 2024 at 10:05 PM
The decline and loss of sharks & rays is a key example of how overfishing is eroding marine biodiversity. Stronger fisheries management is needed to ensure ocean biodiversity & socioeconomic sustainability.
@iucnshark.bsky.social @sscmarine.bsky.social
#OceanOptimism
🧵19/20
@iucnshark.bsky.social @sscmarine.bsky.social
#OceanOptimism
🧵19/20
Sharks, rays & chimaeras play important roles in marine ecosystems. Their decline could affect ocean health, highlighting the need for ongoing conservation efforts to support their recovery.
#OceanOptimism
🧵 18/20
#OceanOptimism
🧵 18/20
December 5, 2024 at 10:05 PM
Sharks, rays & chimaeras play important roles in marine ecosystems. Their decline could affect ocean health, highlighting the need for ongoing conservation efforts to support their recovery.
#OceanOptimism
🧵 18/20
#OceanOptimism
🧵 18/20
Brightspot countries for shark and ray conservation have:
👉 high catch-per-unit-effort
👉 fisheries subsidies that do not promote overfishing
👉 stronger governance
#OceanOptimism
@nancyknowlton.bsky.social
@sharkcolin.bsky.social
🧵17/20
👉 high catch-per-unit-effort
👉 fisheries subsidies that do not promote overfishing
👉 stronger governance
#OceanOptimism
@nancyknowlton.bsky.social
@sharkcolin.bsky.social
🧵17/20
December 5, 2024 at 10:05 PM
Brightspot countries for shark and ray conservation have:
👉 high catch-per-unit-effort
👉 fisheries subsidies that do not promote overfishing
👉 stronger governance
#OceanOptimism
@nancyknowlton.bsky.social
@sharkcolin.bsky.social
🧵17/20
👉 high catch-per-unit-effort
👉 fisheries subsidies that do not promote overfishing
👉 stronger governance
#OceanOptimism
@nancyknowlton.bsky.social
@sharkcolin.bsky.social
🧵17/20
We developed a national RLI and found ecology is important. Countries with healthier Shark & Ray populations (larger RLI), have:
👉 greater shelf area (more habitat)
👉 cooler sea surface temperature
👉 greater primary production
This is consistent with greater extinction risk in the tropics
🧵16/20
👉 greater shelf area (more habitat)
👉 cooler sea surface temperature
👉 greater primary production
This is consistent with greater extinction risk in the tropics
🧵16/20
December 5, 2024 at 10:05 PM
We developed a national RLI and found ecology is important. Countries with healthier Shark & Ray populations (larger RLI), have:
👉 greater shelf area (more habitat)
👉 cooler sea surface temperature
👉 greater primary production
This is consistent with greater extinction risk in the tropics
🧵16/20
👉 greater shelf area (more habitat)
👉 cooler sea surface temperature
👉 greater primary production
This is consistent with greater extinction risk in the tropics
🧵16/20
Bright spots with some science-based fisheries management measure benefiting sharks & rays:
1. USA & Canada
2. NE Atlantic
3. S. Africa
4. Australia & New Zealand
#OceanOptimism
@nancyknowlton.bsky.social
@joshuacinner.bsky.social
www.science.org/doi/epdf/10....
🧵15/20
1. USA & Canada
2. NE Atlantic
3. S. Africa
4. Australia & New Zealand
#OceanOptimism
@nancyknowlton.bsky.social
@joshuacinner.bsky.social
www.science.org/doi/epdf/10....
🧵15/20
December 5, 2024 at 10:05 PM
Bright spots with some science-based fisheries management measure benefiting sharks & rays:
1. USA & Canada
2. NE Atlantic
3. S. Africa
4. Australia & New Zealand
#OceanOptimism
@nancyknowlton.bsky.social
@joshuacinner.bsky.social
www.science.org/doi/epdf/10....
🧵15/20
1. USA & Canada
2. NE Atlantic
3. S. Africa
4. Australia & New Zealand
#OceanOptimism
@nancyknowlton.bsky.social
@joshuacinner.bsky.social
www.science.org/doi/epdf/10....
🧵15/20
Researchers highlight troubling dark spots where shark & ray biodiversity is plummeting.
1. Japan–Taiwan
2. Indonesia to New Guinea
3. India & Bay of Bengal
4. Western Indian Ocean
5. SW Atlantic
6. Galapagos & SE Pacific
7. Gulf of California
🧵14/20
1. Japan–Taiwan
2. Indonesia to New Guinea
3. India & Bay of Bengal
4. Western Indian Ocean
5. SW Atlantic
6. Galapagos & SE Pacific
7. Gulf of California
🧵14/20
December 5, 2024 at 10:05 PM
Researchers highlight troubling dark spots where shark & ray biodiversity is plummeting.
1. Japan–Taiwan
2. Indonesia to New Guinea
3. India & Bay of Bengal
4. Western Indian Ocean
5. SW Atlantic
6. Galapagos & SE Pacific
7. Gulf of California
🧵14/20
1. Japan–Taiwan
2. Indonesia to New Guinea
3. India & Bay of Bengal
4. Western Indian Ocean
5. SW Atlantic
6. Galapagos & SE Pacific
7. Gulf of California
🧵14/20
The current extinction risk trajectory is driving disproportionate (22%) loss of ecological functional diversity of sharks and rays.
www.science.org/doi/epdf/10....
#GlobalSharkTrends
bit.ly/GlobalSharkTrends
🧵13/20
www.science.org/doi/epdf/10....
#GlobalSharkTrends
bit.ly/GlobalSharkTrends
🧵13/20
December 5, 2024 at 10:05 PM
The current extinction risk trajectory is driving disproportionate (22%) loss of ecological functional diversity of sharks and rays.
www.science.org/doi/epdf/10....
#GlobalSharkTrends
bit.ly/GlobalSharkTrends
🧵13/20
www.science.org/doi/epdf/10....
#GlobalSharkTrends
bit.ly/GlobalSharkTrends
🧵13/20
Overfishing of shark ecomorphotypes
👉 littoral ecomorphotype, including requiem, weasel & hammerhead sharks
👉 macro-oceanic species that formerly dominated the pelagic ocean, notably
mackerel sharks, oceanic whitetip, & silky shark
bit.ly/GlobalSharkTrends
🧵12/20
👉 littoral ecomorphotype, including requiem, weasel & hammerhead sharks
👉 macro-oceanic species that formerly dominated the pelagic ocean, notably
mackerel sharks, oceanic whitetip, & silky shark
bit.ly/GlobalSharkTrends
🧵12/20
December 5, 2024 at 10:05 PM
Overfishing of shark ecomorphotypes
👉 littoral ecomorphotype, including requiem, weasel & hammerhead sharks
👉 macro-oceanic species that formerly dominated the pelagic ocean, notably
mackerel sharks, oceanic whitetip, & silky shark
bit.ly/GlobalSharkTrends
🧵12/20
👉 littoral ecomorphotype, including requiem, weasel & hammerhead sharks
👉 macro-oceanic species that formerly dominated the pelagic ocean, notably
mackerel sharks, oceanic whitetip, & silky shark
bit.ly/GlobalSharkTrends
🧵12/20
Overfishing of ray & #FlatShark ecomorphotypes:
➡️ rhinobenthic ecomorphotype
composed of guitarfishes and wedgefishes,
➡️ aquilopelagic mollusk-crushing
(durophagous) eagle rays, cownose rays & planktivorous devil rays,
➡️ squatinobenthic angel shark ambush predators
🧵11/20
➡️ rhinobenthic ecomorphotype
composed of guitarfishes and wedgefishes,
➡️ aquilopelagic mollusk-crushing
(durophagous) eagle rays, cownose rays & planktivorous devil rays,
➡️ squatinobenthic angel shark ambush predators
🧵11/20
December 5, 2024 at 10:05 PM
Overfishing of ray & #FlatShark ecomorphotypes:
➡️ rhinobenthic ecomorphotype
composed of guitarfishes and wedgefishes,
➡️ aquilopelagic mollusk-crushing
(durophagous) eagle rays, cownose rays & planktivorous devil rays,
➡️ squatinobenthic angel shark ambush predators
🧵11/20
➡️ rhinobenthic ecomorphotype
composed of guitarfishes and wedgefishes,
➡️ aquilopelagic mollusk-crushing
(durophagous) eagle rays, cownose rays & planktivorous devil rays,
➡️ squatinobenthic angel shark ambush predators
🧵11/20