Yesterday, I showed off a few embryos I’d collected from my fish tanks that morning — they were at roughly the 16 cell stage. Then today, I put up a video of the same beast at 24 hours old. It was a bit busy, because this is the age when they are going through all kinds of spontaneous muscle contractions, so I also anesthetized one of its siblings and tossed that on the scope. Stoned fish are so much more cooperative.


However, (1) You have to use the correct-sized stone; (2) Don’t start stoning until the local woomeister says to; (3) Don’t name any of the fishies “Jehovah” (thud, Thud!, THUD); and, most importantly, thud! (Ouch!) (4) thud No thud cootie-carriers! THUD! Excuse me, I thud need to urgently Thud limp off thud befor—THUD! THUD!! THUD…
So yesterday it had 16 cells. About how many cells does it have today?
I’d have to guess…a few hundred thousand? A million? I once estimated the number in just the spinal cord of a 5 day fish, and that was about 200,000.
I suppose all the cells in the embryo do not divide at the same constant rate? Otherwise it would be easy to estimate the number of cells after a certain time.
Would you please post videos on YouTube, that I might view them ? periscope.tv has yet to work for me.
“a few hundred thousand? A million?”
Exponential growth FTW, eh? Thanks for the vids and the free educating.
PZ, have you posted about this already?
“Stunning Videos of Evolution in Action: The MEGA-plate allows scientists to watch bacteria adapting to antibiotics before their eyes”
http://www.theatlantic.com/science/archive/2016/09/stunning-videos-of-evolution-in-action/499136