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Fish sperm biology in relation to urogenital system structure

Morphology of the urogenital system has evolved during fish speciation. Chondrostei (sturgeons and paddlefishes) possess an excretory system which is called “primitive” in that the sperm ducts enter the kidneys and share the excretory ducts where sperm is mixed with urine before it is released into...

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Published in:Theriogenology 2019-07, Vol.132, p.153-163
Main Authors: Dzyuba, Viktoriya, Shelton, William L., Kholodnyy, Vitaliy, Boryshpolets, Sergii, Cosson, Jacky, Dzyuba, Borys
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container_title Theriogenology
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description Morphology of the urogenital system has evolved during fish speciation. Chondrostei (sturgeons and paddlefishes) possess an excretory system which is called “primitive” in that the sperm ducts enter the kidneys and share the excretory ducts where sperm is mixed with urine before it is released into the spawning environment. Further, in this group of fishes there are also physiological characteristics which are associated with these anatomical features where the mixing of sperm and urine is a prerequisite for the final sperm maturation rather than contamination. In the Holostei (gars and bowfins) which are closely related to the Chondrostei, sperm also naturally mixed with urine, but the physiological role of such mixing for sperm biology has not been described. In contrast, urinary and sperm ducts in the more evolved Teleostei are completely separate, and sperm and urine are not mixed before being released during spawning. Thus, urine constitutes an inappropriate environment which can be a source of problems when sperm is collected during fisheries practices. In this review, the consequences of such divergent conditions in the urogenital anatomy will be considered in relation to general features of fish sperm biology and in relation to aquaculture and fisheries practices. •Morphology of the urogenital system has evolved during fish speciation.•Urine has no impact on sperm biology in hagfishes, lampreys and elasmobranchs.•In sarcopterygians and holosteans, role of urine for sperm biology is unclear.•In sturgeons, mixing of sperm and urine is a prerequisite for sperm maturation.•In teleosts, contamination of sperm by urine leads to sperm quality decrease.
doi_str_mv 10.1016/j.theriogenology.2019.04.020
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subjects Fish
Sperm maturation
Spermatozoa motility
Urine
Urogenital system
title Fish sperm biology in relation to urogenital system structure
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