Cartilaginous fish and jawless fish are quite different to bony fish. These two groups, also known as Chondrichthyes and Agnatha respectively, build their skeletons using cartilage. A tough but flexible tissue, lighter than bone, that allows them to maintain neutral buoyancy without any need for a swim bladder. In this video we’ll take a look at the differences between jawless fish and cartilaginous fish, and discuss their adaptations and behaviours within the deep sea ecosystem.
Watch Part 1 – Bony Fish: https://youtu.be/PksKZoZIkI4
00:00 – Introduction to Cartilaginous Fish
01:52 – Agnatha – Jawless Fish Structure
02:34 – Agnatha – The Hagfish
03:45 – Agnatha – The Lamprey
04:45 – Evolutionary History of Jawless Fish
05:50 – Elasmobranchs – Structure of Sharks
06:29 – Elasmobranchs – Shark Feeding Behaviours
06:59 – Elasmobranchs – The Cookie cutter Shark
07:15 – Elasmobranchs – The Goblin Shark
07:45 – Elasmobranchs – The Megamouth Shark
08:25 – Elasmobranchs – Scavenger Sharks
09:02 – Elasmobranchs – The Greenland Shark
09:55 – Elasmobranchs – Structure of Rays and Skates
10:27 – Elasmobranchs – The Lifestyle of Rays and Skates
10:57 – Evolutionary History of Cartilaginous Fish
11:29 – Holocephali – Structure of Chimaeras
12:35 – Holocephali – Pelagobenthic Lifestyle of Chimaeras
13:10 – Holocephali – Chimaera Feeding Behaviours
13:55 – Conclusion
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I do not own any of the footage. I write the script, narrate, and edit what footage I can find. Footage used belongs to the incredible marine conservation societies of MBARI, WHOI and the Ocean Exploration Institute, along with various other YouTube sources.
Music Used:
Alone We Have No Future by Ludvig Forssell
The Face of Our New Hope by Ludvig Forssell
An Endless Beach by Ludvig Forssell
Fragile by Ludvig Forssell
A Final Waltz by Ludvig Forssell
#deepsea #wildlife #nature #documentary #ocean #marinebiology #science #biology
Bibliography:
https://sites.google.com/site/swimmingwithdiefishes/riley-s-reef/agnathachondrichthyesosteichthyes
https://www.sharksider.com/understanding-cartilaginous-fish-difference-sharks-rays/
https://saveourseas.com/update/chimaeras-the-sharks-forgotten-cousins/