Jellyfish creates virtual floor to swim efficiently
Researchers have known that an animal swimming parallel to a solid surface receive a subsequent boost in performance, thus allowing them to utilise less energy when moving around.
Studies have quantified this into a 25 percent increase in speed and a 45 percent increase in thrust when swimming near a solid surface.
However, the jellyfish does not swim near the seafloor or seawalls. How does it get named the "world's most efficient swimmer"?
Apparently, it does so by creating a "virtual wall."
How upside-down jellyfish can make the water sting
In some tropical waters like the Florida Keys mangrove forests, for snorkellers to stay safe, it’s not enough to not touch anything. It may not be a good idea to enter the water in the first place.
That’s because sometimes it seems that the water itself can sting, causing rashes on a snorkeller's skin.
How upside-down jellyfish can make the water sting
In some tropical waters like the Florida Keys mangrove forests, for snorkellers to stay safe, it’s not enough to not touch anything. It may not be a good idea to enter the water in the first place.
That’s because sometimes it seems that the water itself can sting, causing rashes on a snorkeller's skin.
How Jellyfish See Things
Box jellyfish have four morphologically different types of eyes. Two of these eye types called the upper and lower lens eyes, are camera type eyes with spherical fish-like lenses.
Periphylla: Aliens of the Deep
The jet-black rubber RIB was running flat out in the February night. We were sweeping past the Mongstad oil refinery at the Norwegian west-coast, just south of Gulen Dive Resort, and the clock was approaching midnight. Apart from the lights in the distance, the visibility was zero, and we were navigating solely on GPS, chart plotter and radar. The speed of 35 knots produced a howling wind, although the sea was completely calm.
Glowing Jellyfish
Glowing red lures are used by deep-sea jelly to catch fish