Under the Microscope: Elephant fish embryo (Lecture 15 of 17) Cambridge University

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Dr Andrew Gillis explains how an elephant fish embryo lives off a large yellow yolk sack for 7 to 10 months before hatching out as a fish.

Cambridge University's Under the Microscope is a collection of videos that show glimpses of the natural and man-made world in stunning close-up. Check out the rest of the series here: http://bit.ly/A6bwCE

Dr Gillis:

"This is a picture of an elephant fish embryo. Elephant fish are cartilaginous fishes, and are distant cousins of sharks, skates and stingrays. The elephant fish lives in deep water off the coasts of Australia and New Zealand, but migrates annually into shallow coastal bays to lay their eggs. I study the embryonic development of elephant fish, by collecting their eggs by SCUBA diving at their egg-laying grounds. Normally, an elephant fish embryo will live in their egg and feed off of their yolk supply for 7 to 10 months before hatching out as a completely self-sufficient juvenile. However, these embryos may also be cultured outside of their egg cases, as seen here. This allows us to observe and photograph the development and growth of this unusual fish."

The diameter of the petri dish in the elephant fish picture is 10cm.

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