Comparative study of the reproductive characteristics of XY male and hormonally sex-reversed XX male Eurasian perch, Perca fluviatilis

Theriogenology
C RougeotC Mélard

Abstract

In order to compare the reproductive capacity of XY male versus XX male (neomales) Eurasian perch (Perca fluviatilis), we determined the sperm quality (sperm concentration and motility) and reproductive characteristics such as gonadosomatic index (GSI), fertilization rate and sex steroid levels (testosterone, T; 17beta-estradiol, E2 and 11-ketotestosterone, 11KT) during the reproductive season. Median GSI was not significantly different between XY males (7.9%) and XX males (7.5%). Fertilization rates ranged between 30.0 and 98.0%. Sperm concentration ranged between 27.9 x 10(9) and 42.0 x 10(9) spermatozoa ml(-1). Median level of T, 11KT and E2 levels increased in the middle of the reproductive season (2136.0, 2409.0 and 3252.0 pg ml(-1), respectively) and decreased at the end (1657.0, 2006.6 and 431.0 pg ml(-1), respectively). Sperm motility was assessed by CASA and expressed by the curvilinear velocity (VCL), straight line velocity (VSL), average path velocity (VAP), linearity (LIN), percentage of motile sperm (% MOT) and motile concentration (MOC). Overall, there were not any significant differences between XY and XX males. In conclusion, no differences of reproductive capacities were observed between XY males and XX males s...Continue Reading

References

Oct 1, 1982·General and Comparative Endocrinology·D E Kime, N J Manning
Nov 3, 2001·Reproduction : the Official Journal of the Society for the Study of Fertility·A T ViveirosJ Komen
Dec 12, 2001·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·D E KimeF Ollevier

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Citations

Sep 20, 2008·Journal of Fish Diseases·L-G LönnströmT Wiklund
Jan 25, 2017·Proceedings of the National Academy of Sciences of the United States of America·Laia RibasFrancesc Piferrer
Jan 23, 2018·Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology·Vincent GennotteCarole Rougeot

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