How cephalopods see colour

Researchers from the UC Berkeley and Harvard University propose “colourblind” cephalopods may be able to see colour after all!

The father and son team Alexander and Christopher Stubbs, suggest octopus and cuttlefish use their large, wide pupils to accentuate the refraction of different wavelengths of light. They may be able to sense colour by bringing certain wavelengths into focus on the retina.

Click here to see the full journal paper.

Sea lion facts

Sea lions can hold their breath for up to 20 minutes. Unlike dolphins, sea lions exhale before diving. Their nostrils have special muscles to open them in order to breathe.

Sea lions can dive to depths over 250m, these animals have a high tolerance for carbon dioxide.The oxygen in their body concentrates in their heart and central nervous system rather than in non-vital organs. Their relative, the elephant seal, can hold its breath for 62 minutes and dive to depths over 1200m

Starfish communication

Scientists have “cracked the code” of crown-of-thorns starfish communication.

For the first time, we are able to better understand the critical importance of the chemical communication that drives crown-of-thorns behaviour, providing excellent leads in the development of biocontrol technologies.

The paper ‘The crown-of-thorns starfish genome as a guide for biocontrol of this coral reef pest’ appeared online last month in the journal Nature. Click here to learn more:

Bizarre remora behaviour

While conducting fish surveys in The Solomon Islands, we were approached by several large remora ‘suckerfish’. Their distinctive first dorsal fins take the form of a modified oval, sucker-like organ with slat-like structures that open and close to create suction and take a firm hold against the skin of larger marine animals.

As far as we understand, the face first embrace captured in this video is never-before seen behaviour from these animals.