Did you know that there are sharks that are biofluorescent, even in their eyes? That means they reflect certain lights (unlike bioluminecence, where they glow themselves). The chain catshark glows bright neon green all over in oceans natural blue light (when seen through shark eyes). We don’t know why.


The chain catshark is a beautiful little shark living on the east coast and in the Gulf of Mexico. Like all catsharks, the female chain catshark lays egg cases. She anchors them in place by wrapping the cases’ tendrils around vertical bottom structures. Captive breeding in aquariums is very easy, and the translucent egg cases are very useful to study. The embryos take 8 – 12 months to develop.

Scyliorhinus retifer okeanos.jpg
Scyliorhinus retifer okeanos” by NOAA Okeanos Explorer Program – http://oceanexplorer.noaa.gov/okeanos/explorations/ex1202/logs/mar22/media/mar22-3.html. Licensed under Public Domain via Commons.

Sources: here and here

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