Meaning of 孵化 in Japanese

Definition of 孵化

ふか(fuka) 【孵化 ·ふ化】

(n, vs) incubation; hatching
卵から孵化したてのメダカにはどのようなえさをあげればよろしいでしょうか？
What should you feed killifish that have just hatched from their eggs?

じんこうふかほう(jinkoufukahou) 【人工孵化法 ·人工ふ化法】

ふかき(fukaki) 【孵化器】

じんこうふか(jinkoufuka) 【人工孵化 ·人工ふ化】

ふかじょう(fukajou) 【孵化場 ·ふ化場】

The down of chicks that have just hatched is damp, but after two hours it dries out and becomes fluffy.

What should you feed killifish that have just hatched from their eggs?