Abstract
Eyed embryos and fingerlings of trouts between diploid females and allotriploid males were obtained. There were two groups, namely, one group with the chromosome number of 79-83 (group I), and another with that of 110-112 (group II). Judging from numbers and constitutions of the chromosomes, it is presumed that the individuals in group I were 2.5n and those in group II were 3.5n. All fingerlings were 3.5n, and 2 fingerlings of them were still surviving as of September, 1990, about 7 months after the hatching.
