Final answer:
Metaphase in whitefish blastula is a stage of mitosis where the chromosomes line up along the metaphase plate in the center of the cell.
Step-by-step explanation:
In whitefish blastula, metaphase is a stage of mitosis where the chromosomes line up along the metaphase plate in the center of the cell. This can be observed through microscopic imaging of whitefish blastula cells. During metaphase, the chromosomes are condensed and visible, which makes it easier to identify this stage.