George Lauder
@georgelauder.bsky.social
Prof. at Harvard University: research on fish biorobotics, biomimetics, biomechanics, morphology, shark locomotion and skin function, and fish schooling
people.fas.harvard.edu/~glauder/
and
https://scholar.google.com/citations?user=s-FMUNgAAAAJ&hl=e
people.fas.harvard.edu/~glauder/
and
https://scholar.google.com/citations?user=s-FMUNgAAAAJ&hl=e
4. The keel lateral line canal (pink color) is quite strange: neuromasts are surrounded by modified scales (shown in blue), and keels have an odd set of elongated skeletal elements posteriorly. Tuna keels are clearly mechanosensory.
February 3, 2025 at 6:28 PM
4. The keel lateral line canal (pink color) is quite strange: neuromasts are surrounded by modified scales (shown in blue), and keels have an odd set of elongated skeletal elements posteriorly. Tuna keels are clearly mechanosensory.
3. Now, a team led by @juliachaumel.bsky.social and published in iScience @cp-iscience.bsky.social shows that tuna keels have a sensory function too! Each keel has a peculiar lateral line canal with small tubules that extend to the upper and lower keel surfaces (www.cell.com/iscience/ful...
February 3, 2025 at 6:28 PM
3. Now, a team led by @juliachaumel.bsky.social and published in iScience @cp-iscience.bsky.social shows that tuna keels have a sensory function too! Each keel has a peculiar lateral line canal with small tubules that extend to the upper and lower keel surfaces (www.cell.com/iscience/ful...
2. And here’s a view of the caudal fin and keels from behind during #tuna locomotion. Our previous work has shown that the keels decrease power requirements during swimming, likely by reducing lateral forces and yaw torques. But wait, there's more!
February 3, 2025 at 6:28 PM
2. And here’s a view of the caudal fin and keels from behind during #tuna locomotion. Our previous work has shown that the keels decrease power requirements during swimming, likely by reducing lateral forces and yaw torques. But wait, there's more!
We propose that the ray tail acts like a “hydrodynamic antenna” providing detailed information to the ray on water movement behind the body. This video shows the effect of moving water near the tail of a cownose ray as it passes by.
January 22, 2025 at 5:18 PM
We propose that the ray tail acts like a “hydrodynamic antenna” providing detailed information to the ray on water movement behind the body. This video shows the effect of moving water near the tail of a cownose ray as it passes by.
There are paired lateral line canals along both sides of the entire length of the tail with a remarkable branched structure that ends at the tail surface with clusters of pores. Each canal has a continuous neuromast that extends the entire tail length!
January 22, 2025 at 5:18 PM
There are paired lateral line canals along both sides of the entire length of the tail with a remarkable branched structure that ends at the tail surface with clusters of pores. Each canal has a continuous neuromast that extends the entire tail length!
What is the function of the elongate tail in elasmobranch #rays? A 🧵 and a new hypothesis. A paper with @juliachaumel.bsky.social in @royalsociety.org Proceedings B (shorturl.at/PmfYD) shows that the tail of cownose rays (and a few other species studied so far) has an elaborate lateral line.
January 22, 2025 at 5:18 PM
What is the function of the elongate tail in elasmobranch #rays? A 🧵 and a new hypothesis. A paper with @juliachaumel.bsky.social in @royalsociety.org Proceedings B (shorturl.at/PmfYD) shows that the tail of cownose rays (and a few other species studied so far) has an elaborate lateral line.
What is the significance of the tremendous diversity of #shark skin #denticles? Presenting our experimental approach to understanding this at the Atlanta #SICB2025 meetings. Come to the session for all things shark skin!
December 31, 2024 at 5:56 PM
What is the significance of the tremendous diversity of #shark skin #denticles? Presenting our experimental approach to understanding this at the Atlanta #SICB2025 meetings. Come to the session for all things shark skin!
This occurs largely because individuals within the school alter the flow environment with their undulating bodies and proximity: fish within schools in turbulence swim more closely together as speed increases compared to schools in laminar flow:
December 3, 2024 at 12:44 AM
This occurs largely because individuals within the school alter the flow environment with their undulating bodies and proximity: fish within schools in turbulence swim more closely together as speed increases compared to schools in laminar flow:
We showed that swimming in turbulence by fish schools dramatically reduces both the cost of swimming (orange curve, left panel, compared to purple curve), and the cost of transport (right panel) when in turbulence compared to individuals swimming alone.
December 3, 2024 at 12:38 AM
We showed that swimming in turbulence by fish schools dramatically reduces both the cost of swimming (orange curve, left panel, compared to purple curve), and the cost of transport (right panel) when in turbulence compared to individuals swimming alone.
A new idea: the “turbulence sheltering hypothesis”. Fish in a school could modulate surrounding turbulence so that chaotic fluid motion increasing swimming cost is less. Fish in a group would use less energy compared to swimming alone in turbulent conditions.
December 3, 2024 at 12:21 AM
A new idea: the “turbulence sheltering hypothesis”. Fish in a school could modulate surrounding turbulence so that chaotic fluid motion increasing swimming cost is less. Fish in a group would use less energy compared to swimming alone in turbulent conditions.
Why do #fish swim in #schools? A🧵and new hypothesis. Schooling could help fish avoid predators, navigate, communicate, find mates and food, and save energy. Here we propose and test a new hypothesis: https://tinyurl.com/yc764d74
December 3, 2024 at 12:15 AM
Why do #fish swim in #schools? A🧵and new hypothesis. Schooling could help fish avoid predators, navigate, communicate, find mates and food, and save energy. Here we propose and test a new hypothesis: https://tinyurl.com/yc764d74
There are a wide variety of hydrodynamic mechanisms that allow energy savings as fish swim near each other and in each others wake, and fish in schools are changing relative positions dynamically through time.
December 3, 2024 at 12:44 AM
There are a wide variety of hydrodynamic mechanisms that allow energy savings as fish swim near each other and in each others wake, and fish in schools are changing relative positions dynamically through time.
We also showed that schooling fishes saved relatively more energy as they moved faster compared to solitary fish, and that the cost of transport curve is also U-shaped with clear benefits to swimming in a group.
December 3, 2024 at 12:32 AM
We also showed that schooling fishes saved relatively more energy as they moved faster compared to solitary fish, and that the cost of transport curve is also U-shaped with clear benefits to swimming in a group.
By swimming both schools and solitary fish over a wide range of speeds, we showed that (1) very low speed swimming involves as much energy use as swimming at 3 body lengths/sec, and that the metabolism-speed curve is U-shaped over this speed range.
December 3, 2024 at 12:26 AM
By swimming both schools and solitary fish over a wide range of speeds, we showed that (1) very low speed swimming involves as much energy use as swimming at 3 body lengths/sec, and that the metabolism-speed curve is U-shaped over this speed range.
And, we need to study school and solitary swimming over a range of speeds and measure energy use both during swimming and during post-exercise recovery to quantify EPOC: the energy used to sustain swimming at high speeds beyond the aerobic threshold.
December 3, 2024 at 12:21 AM
And, we need to study school and solitary swimming over a range of speeds and measure energy use both during swimming and during post-exercise recovery to quantify EPOC: the energy used to sustain swimming at high speeds beyond the aerobic threshold.
Do #fish swimming in a #school actually save energy? A🧵on this as our paper in @eLife https://elifesciences.org/articles/90352 by @TheYangfanZHANG addresses this question. This is a challenging issue to study: energy use by a school should be compared to solitary locomotion
December 3, 2024 at 12:16 AM
Do #fish swimming in a #school actually save energy? A🧵on this as our paper in @eLife https://elifesciences.org/articles/90352 by @TheYangfanZHANG addresses this question. This is a challenging issue to study: energy use by a school should be compared to solitary locomotion
Do #fish swimming in a #school actually save energy? Our paper on this in eLife elifesciences.org/articles/90352 addresses this question. This is a challenging issue: energy use by a school needs to be compared to solitary locomotion on a per gram basis under the same swimming conditions.
February 21, 2024 at 6:27 PM
Do #fish swimming in a #school actually save energy? Our paper on this in eLife elifesciences.org/articles/90352 addresses this question. This is a challenging issue: energy use by a school needs to be compared to solitary locomotion on a per gram basis under the same swimming conditions.
The shark #denticle #multiverse will be on display at #sicb2024 this week. See talks in the
@SICB_DCB_DVM
sessions. So much diversity, so little time ... below the #ontogeny of sleeper shark denticles from Vaz et al. 2023: mdpi.com/1424-2818/15...
@SICB_DCB_DVM
sessions. So much diversity, so little time ... below the #ontogeny of sleeper shark denticles from Vaz et al. 2023: mdpi.com/1424-2818/15...
January 2, 2024 at 8:13 PM
The shark #denticle #multiverse will be on display at #sicb2024 this week. See talks in the
@SICB_DCB_DVM
sessions. So much diversity, so little time ... below the #ontogeny of sleeper shark denticles from Vaz et al. 2023: mdpi.com/1424-2818/15...
@SICB_DCB_DVM
sessions. So much diversity, so little time ... below the #ontogeny of sleeper shark denticles from Vaz et al. 2023: mdpi.com/1424-2818/15...
The shark #denticle #multiverse will be on display at #sicb2024 this week. See talks in the @SICB_DCB_DVM sessions. So much diversity, so little time ... below the #ontogeny of sleeper shark denticles from Vaz et al. 2023: https://www.mdpi.com/1424-2818/15/11/1105
December 3, 2024 at 12:16 AM
The shark #denticle #multiverse will be on display at #sicb2024 this week. See talks in the @SICB_DCB_DVM sessions. So much diversity, so little time ... below the #ontogeny of sleeper shark denticles from Vaz et al. 2023: https://www.mdpi.com/1424-2818/15/11/1105
We showed that fish tune their tail beat to the foil, intercept vortices, slightly alter body motion, and tune phase based on their distance from the foil. Due to how the head intercepts the foil wake we propose that fish can reduce swimming costs even in a thrust wake.
December 3, 2024 at 12:39 AM
We showed that fish tune their tail beat to the foil, intercept vortices, slightly alter body motion, and tune phase based on their distance from the foil. Due to how the head intercepts the foil wake we propose that fish can reduce swimming costs even in a thrust wake.
@rthandiackal and I conducted experiments to simplify the in-line swimming condition and allow a fish to swim in a thrust wake generated by a flapping foil (the @eLife link makes it easy to see the videos embedded into the main text): https://elifesciences.org/articles/81392
December 3, 2024 at 12:32 AM
@rthandiackal and I conducted experiments to simplify the in-line swimming condition and allow a fish to swim in a thrust wake generated by a flapping foil (the @eLife link makes it easy to see the videos embedded into the main text): https://elifesciences.org/articles/81392
The difference between fish swimming in reduced flow (a drag wake) and in-line (with a thrust wake impacting the following fish) is nicely summarized by the graphic below from the commentary by @icouzin and Liang Li in @eLife: https://elifesciences.org/articles/86807
December 3, 2024 at 12:26 AM
The difference between fish swimming in reduced flow (a drag wake) and in-line (with a thrust wake impacting the following fish) is nicely summarized by the graphic below from the commentary by @icouzin and Liang Li in @eLife: https://elifesciences.org/articles/86807