Live haploid-diploid mosaic charr Salvelinus leucomaenis

A live haploid-diploid mosaic charr Salvelinus leucomaenis, in which 89% of erythrocytes were unusually small, was found by chance. This individual was-externally normal in shape and grew to the adult size (335 mm body length, 324 g body weight). Flowcytometry for DNA content revealed that large population of cells in blood, liver, and spleen were haploid, whereas those in brain were diploid. Thus, this individual was concluded to be a mosaic consisted of two types of cells with different ploidies. These results suggested that haploid cells may have normal function in the mosaic environment including diploid cells. Histological observation showed that this mosaic charr was a female with ovaries filled with degenerating and degenerated oocytes which showed various abnormalities and was likely to lack normal reproductive ability, even if it had survived longer.