One Zebra fish, sex unknown
Can you tell at which stage of development each frame is in?  Check the Developmental stages website at the left to solve.
These are the zebra fish that we kept in our tanks.  We had three tanks running, two with about a dozen females each, and one with about a dozen males.
Zebra Fish (Danio rerio)

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  Embryology

Online Resource - Developmental Stages

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