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Spermatozoa of artificially induced triploid red sea bream Pagrus major Temminck and Schlegel


, : Spermatozoa of artificially induced triploid red sea bream Pagrus major Temminck and Schlegel. Fisheries Science 61.2: 355-356

The spermatozoa of the artificially induced triploid red sea bream Pagrus major (Temminck and Schlegel) were studied from morphological and genetic aspects. Total milt volume of the triploid was one-tenth as much as that of the diploid. Head length of the triploid spermatozoa (2.7 plus or minus 0.81 mu m) was 35% larger than that of the diploid (2.0 plus or minus 0.31 mu m). The mobility of the triploid spermatozoa could be hardly observed. The abnormality was seen in the triploid spermatozoa at a high frequency (29.3%), while it was rare in those of the diploid (0.5%). They were double heads, head malformation, multiflagella and the abnormal position of mitochondria onto a head. In flow cytometry, differing from the cases in other artificial triploid fishes (e.g., Oncorhynchus mykiss), the peak of the DNA content of the triploid spermatozoa was N, 2N, 3N, 6N and 7N, while that of the diploid was N.

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