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The Ocean Depths! (1). Wooooo - Boogey - Boogey!. Areas of the Deep Sea. How Surface Water Masses Reach The Bottom. near Greenland. “Thermohaline Circulation”. Near the Antarctic. The Great Ocean Conveyor Belt. The Mesopelagic. The Twilight Zone.

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The ocean depths 1

The Ocean Depths! (1)

Wooooo - Boogey - Boogey!

How Surface Water Masses Reach The Bottom

near Greenland

“Thermohaline Circulation”

Near the Antarctic

The Mesopelagic

The Twilight Zone

Deep Sea Life Is Closely Correlated With Plankton Abundance And Light Intensity


Bottom of Mesopelagic Zone – No Light exists here

Food Sources in the Deep Sea And Light Intensity

A few mesopelagic critters
A Few Mesopelagic Critters … And Light Intensity

Mesopelagic Crustaceans And Light Intensity

Opossum shrimp


true (decapod) shrimp

Mesopelagic Squid Showing Photophores Length

Photophores, or light organs, are characteristic of many animals in the mesopelagic – they are active in bioluminescence

Typical Mesopelagic Fishes Length


pacific viperfish






Adaptations of mesopelagic fishes
Adaptations of Mesopelagic Fishes Length

  • Small body size – limited food supply

  • Large mouths hinged to disarticulate

  • Generalized omnivores with abundant, long, sharp teeth

  • Feeding habits – migrators and non-migrators

  • Sense organs – tubular eyes with 2 retinas; well-developed lateral lines

Adaptations con t coloration and body shape
Adaptations Con’t.: Coloration and Body Shape Length

  • Countershading

  • Transparency – especially in upper areas of mesopelagic

  • Lateral compression of the body

  • Photophores and Bioluminescence

An Adaptation for Large Prey – Hinged Jaws! Length

Viper fish

Rattrap fish

Opportunists of the Deep

Convergent Evolution of Tubular Eyes in Mesopelagic Organisms

Krill – bilobed eye

Midwater fish - Scopelarchus

Deep-Sea Octopus

Having Photophores Is Adaptive ! Organisms

Squid Without Photophores

Squid With Photophores

The ocean depths 2

The Ocean Depths! (2) Organisms

Wooooo - Boogey - Boogey!

Below the mesopelagic the world of perpetual darkness
Below the Mesopelagic – OrganismsThe World of Perpetual Darkness

  • Below this zone which stops at about 1,000 meters is the:

  • Bathypelagic - 1,000 to 4,000 meters

  • Abyssopelagic - 4,000 to 6,000 meters

  • Hadopelagic – below 6,000 meters and into the trenches

The Bathypelagic – Home Of Perpetual Darkness Organisms



(upper reaches)

Some Deep-Sea Fishes Organisms


Note very small, parasitic male



The problem of finding a mate
The Problem Of Finding A Mate … Organisms

  • Produce light ! (bioluminescence)

  • Produce an odor ! (pheromones)

  • Be a parasite and attach to the other sex !

  • Be a hermaphrodite and say “to heck with it” !

Sampling methods for the mesopelagic and beyond
Sampling Methods for the Mesopelagic and Beyond … Organisms

A Remote-Controlled Midwater Trawl