1 2 3 4 5

			The Effect of pH Levels By Varying the Acidity of the Extracellular Solution on the Developmental Growth of a Zebrafish embryo, Brachydanio rerio John K. De Long IV
		Background
		Zebrafish, Brachydanio rerio, have a distinct embryonic development. The embryo goes through a process called epiboly. Epiboly, as defined in the sixth edition of Developmental Biology(Gilbert 2000), is the movement of epithelial sheets (usually of the ectoderm cells) that spread as a unit, rather than individually, to enclose the deeper layers of the embryo. Epiboly enables an embryo to protect the inner cells from extracellular variations. According to Professor Richard Fluck, who works with medaka and is a Dr. E. Paul and Frances H. Reiff Professor of Biology at Franklin and Marshall College, it is his experience that medaka embryos are more susceptible to exterior environmental change prior to complete epiboly. Zebrafish are supposed to be even more sensitive to environmental change than medaka.