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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:    • The Incredible Diversity of Bony Fish  

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/swimmin...
https://www.sharksider.com/understand...
https://saveourseas.com/update/chimae...