Get smart curated videos delivered to your inbox every week.      
The Kid Should See This

Transparent leptocephalus: Eel larvae at Enoshima Aquarium

Please enjoy this Enoshima Aquarium footage of leptocephalus, an ell (and similar kinds of fish) in its transparent larval phase. This stage can last longer than most other larval phases, from three months to a year. From wikipedia

This is one of the most diverse groups of teleosts, containing 801 species over the span of 24 orders, 24 families, and 156 genera. It is supposed that this group arose in the Cretaceous period over 140 million years ago… 

Leptocephali (singular leptocephalus) all have laterally compressed bodies that contain transparent jelly-like substances on the inside of the body and a thin layer of muscle with visible myomeres on the outside. Their body organs are small and they possess only a simple tube for a gut. This combination of features results in them being very transparent when they are alive.

Related transparent viewing: the barreleye fish (an internet classic), as well as this fly-eating glass mantis. There are also lots of fish swimming in the archives. 

This award-winning video collection is reader-supported. Become a sustaining member to keep TKSST online and free for everyone, including teachers and parents who use it as a resource to spark learning and curiosity for kids.

🌈 Watch these videos next...

Phone Booth Aquariums (Evasion Urbaine)

Rion Nakaya

Red Batfish or Starry Handfish – Enoshima Aquarium

Rion Nakaya

An “invisibility cloak” prototype material by Hyperstealth Biotechnology

Rion Nakaya

Molting Japanese spider crab time lapse – Enoshima Aquarium

Rion Nakaya

An octopus unscrews a jar from the inside

Rion Nakaya

The ‘magic’ of invisibility lenses

Rion Nakaya

Koi Pond Skyscraper: Fish flock get a better view

Rion Nakaya

Baby Octopus at the Vancouver Aquarium

Rion Nakaya

The Blue Button Jellyfish (porpita porpita), not actually a jelly

Rion Nakaya