Zebrafish Day 2: Tuesday

Today 7th grade students transferred the adult fish out of the tanks and isolated the embryos produced overnight into petri dishes. Data collection included counting the embryos, observing them under the microscope, sketching their anatomy, and calculating their ages (in hours post fertilization). Embryo ages ranged from 45 minutes old (with just 2 stem cells!) to 12 hours old (with cells clearly specializing into parts of the body).

It is too early to determine the pigmentation of the embryos; we will have to wait until Thursday to see if our hypotheses were correct about the appearance of offspring produced by a wildtype female and an albino male.