The proposal is aimed to establish the cytobiological biotechnology to be used in selectedlocal finfishes in Taiwan. The tentative research approaches will follow that used inshellfish so that technologies of chromosome manipulation via automatic apparatus willbecome available also in finfish. Meanwhile, owners of aquaculture hatcheries willtherefore have high possibility to adopt scientific biotechnology to achieve the goal ofproducing fast-growing fish and to improve the quality of polyploid finfish harvestedduring its propagation season. The further purpose is to demonstrate to more fishhatchery owners of non-experimental species such a modern biotechnology with thehigh potential of international competition.