PROBLEM TO BE SOLVED: To provide a technique that is used for mass-producing seedlings (zoea) of king crab species by synchronously inducing hatching of eggs of the king crab species.SOLUTION: A synchronous hatching method of crab eggs of king crab species such as king crabs, abra crabs and Hanasaki crabs is characterized by repeatedly performing next steps (A) and (B). (A) is a step of taking out brooding female crab of king crab species from the inside of a breeding aquarium and exposing the female crabs in a gas-phase. (B) is a step of returning the female crabs in the breeding aquarium and breeding the female crabs while recovering the hatched zoea.SELECTED DRAWING: Figure 1【課題】タラバガニ属のカニの卵の孵化を同調的に誘発させ、タラバガニ属の種苗（ゾエア）を大量生産するための技術提供する。【解決手段】次の（Ａ）及び（Ｂ）の工程を繰り返し行うことを特徴とする、タラバガニ、アブラガニ、ハナサキガニなどのタラバガニ属のカニの卵の同調的孵化方法により解決する。（Ａ）抱卵中のタラバガニ属の雌ガニを飼育水槽中から取り出し、該雌ガニを気相中に晒す工程。（Ｂ）該飼育水槽中に該雌ガニを戻し、その後孵化したゾエアを回収しつつ該雌ガニを飼育する工程。【選択図】図１
