(Source: C.B. Kimmel, W.W. Ballard, S.R. Kimmel, B. Ullmann, and T.F. Schilling from Zebrafish Book 5th Edition)

Stages of Embryonic Development of the Zebrafish; C.B. Kimmel, W.W. Ballard, S.R. Kimmel, B. Ullmann, and T.F. Schilling; Developmental Dynamics, 1995 New York: Wiley-Liss.  Reprinted by permission of Wiley-Liss, a subsidiary of John Wiley & Sons, Inc.