Abstract
We have compared various properties of spermatozoa from the wild diploid male pond loach Misgurnus anguillicaudatus to those from the interspecific male hybrid of the cross between a female M. anguillicaudatus and a male mud loach M. mizolepis. Our results show that spermatozoa from this interspecific hybrid had poor motility, low viability, abnormal morphology, a larger volume of mitochondrial mass per cell and higher ATP content of spermatozoa with tetraploid DNA content, and they were present at a low concentration. The interspecific hybrid males produced spermatozoa with a larger head, with either no flagellum (36.4 %), one flagellum (46.7 %) or two flagella (16.9 %). These flagella were shorter than those of the normal wild-type male M. anguillicaudatus and often presented with abnormalities in microtubule structure. An abnormally shorter flagellum has difficulty in propelling tetraploid spermatozoa with an increased head size in normal progressive motility, although they had higher energy, as shown by their larger volume of mitochondrial mass and higher ATP content. These tetraploid spermatozoa are likely produced by the arrest of the regular meiotic division after chromosomal replication, followed by abnormal spermiogenesis.
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Acknowledgments
This work was supported in part by Grants-in-Aid from JSPS-KAKENHI (grant no. 21380114) and JAMBIO (grant nos. 23-11 and 24-11) to KA and TF; grants from Youth Scholars of Shanghai Higher Education Institutions–China (grant no. A1-2035-14-0010-9) and the Doctoral Fund (grant no. A1-0209-13-0105390) to YZ; grants from the Ministry of Education, Youth and Sports of the Czech Republic (projects “CENAKVA”; grant no. CZ.1.05/2.1.00/01.0024 and “CENAKVA II”, LO1205 under the NPU I program) to MP.
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Zhao, Y., Fujimoto, T., Pšenička, M. et al. Non-motile tetraploid spermatozoa of Misgurnus loach hybrids. Fish Sci 82, 127–135 (2016). https://doi.org/10.1007/s12562-015-0939-7
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DOI: https://doi.org/10.1007/s12562-015-0939-7