Our short and to the point PRESSURISED version of episode 24. If you don't have time for the full episode and want to get right to the science without any of our waffle, this is the place to be!

Read the show notes and find the full episode here:

https://www.armatusoceanic.com/podcast/024-pelagic

We have a confession to make. We talk a big game about how we are busting myths, tackling deep-sea tropes and showing the deep ocean as it really is… but we have been guilty of one of the big ones. The deep sea is not just the bottom! Most of the deep sea, in fact, most of the habitat of this planet is the huge open 3D environment of open water or ‘pelagic’ water. In this staggering volume the planets largest migration takes place twice a day. Animals are locked in an evolutionary arms race, using their own light to deceive and trick. Finding a meal is rare, finding a mate is rare and life is without boundaries. These factors have led to some truly wild evolution.

We hear from Don about hunting for the 'deep scattering layer' (DSL) before we even knew what it was.

In recent news we cover Edith Widder and her new book Below the Edge of Darkness, underwater GPS through the power of a pong, following the yellow brick road to meet the deep-sea wizard and some lovely new footage of a highfin dragonfish.

Check out our podcast merch! Which now includes Alan’s beloved apron.

Feel free to get in touch with us with questions or you own tales from the high seas on:

[email protected]

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Read the show notes and find out more about us at:

www.armatusoceanic.com

Abyssopelagic – open water 4-6 km (13,000 to 20,000 ft) deep

Aphotic zone – depths deeper than life penetrates

Bathypelagic – also known as the midnight zone, open water roughly 1-4 km (3,300-13,000 ft) deep

Benthic – associated with the bottom, how we usually think about the deep sea

Deep Scattering Layer (DSL) – a ‘false bottom’ created on sonar by huge numbers of open water animals

Dragonfish – deep-sea predators of the family Stomiidae

Dysphotic zone – the depth that light still penetrates but photosynthesis is becoming unviable

Euphotic zone – the surface and well illuminated zone

Hadalpelagic – open water >6 km deep

Mesopelagic – also called the twilight zone, starts where 1% of light reaches and ends where there is none, roughly 200-1,000 m (656-3,280 ft) deep

Myctophids – Lanternfish, fish responsible for the biggest carbon movements on the planet

Nictoepipelagic – The wink on the open sea. Great word for these vertical migrators

Pelagic – open ocean, away from the shore and the bottom

Photic zone – the depth that light penetrates

Vertical migration – the twice daily migration of deep-sea animals up to the surface to feed

Tracey’s lab website

The synthesis paper of a decade of research into the Deepwater Horizon disaster. Open access

Carbon export model for mesopelagic fishes in the Gulf of Mexico

Edith Widder

Eye in the ocean

Edith’s new book

Vox podcast

Underwater GPS

Yellow-brick Road

Credits

Theme – Hadal Zone Express by Märvel