Stocks of sturgeons are decreasing dramatically Conte et al. The world sturgeon catch was nearly 28 tonnes in and less than tonnes by Billard and Lecointre Sinceartificial propagation and rearing of sturgeons has been implemented with a general trend in development of fish culture in the southern part of the Caspian Sea, Iran Azari Takami
For reproduction, most fish species adopt external fertilization: their spermatozoa are delivered in the external milieu marine- or freshwater that represents both a drastic environment and a source of signals that control the motility function. This chapter is an updated overview of the signaling pathways going from external signals such as osmolarity and ionic concentration and their membrane reception to their transduction through the membrane and their final reception at the flagellar axoneme level. Additional factors such as energy management will be addressed as they constitute a limiting factor of the motility period of fish spermatozoa.
Fish Physiology and Biochemistry. Fish sperm motility is nowadays considered the best sperm quality biomarker in fish, and can be evaluated both by subjective and computerized methods. With the aim to compare the precision and accuracy of both techniques, fish sperm samples were assessed by subjective methods and by a computer-assisted sperm analysis CASA-Mot system, and simultaneously by three different technicians with different degrees of expertise on the sperm quality analysis.
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Photo-modulation with visible light has been used to induce gains in the motility of the sperms of rabbits, boars, buffalo, bulls, fish, and humans. Although different hypotheses have been proposed to explain such an effect, the origin and mechanisms by which visible light affects sperm motility are still far from being completely understood. Also, it has been reported that blue light induces nitric oxide production in sperm cells, which plays a vital role in acrosome reaction and capacitation leading to an augmentation in the fertilisation probability.
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If you buy something through a link on this page, we may earn a small commission. How this works. Healthy sperm are an important factor in male fertility.
Correspondence to: M. All Rights Reserved. Motility is an important function of the male gamete, which allows sperm to actively reach and penetrate the female gamete in organisms with internal and external fertilization. Sexual activity of some fish is generally seasonal and fertilization is external.
Fish sperm motility is nowadays considered the best sperm quality biomarker in fish, and can be evaluated both by subjective and computerized methods. With the aim to compare the precision and accuracy of both techniques, fish sperm samples were assessed by subjective methods and by a computer-assisted sperm analysis CASA-Mot system, and simultaneously by three different technicians with different degrees of expertise on the sperm quality analysis. Statistical dispersion parameters CV, coefficient of variation; and RG, range were estimated in order to determine the precision and accuracy of the techniques and the influence of laboratory staff on sperm motion assessments.
Although a relatively high number of sperm quality biomarkers have been reported over the years in several fish species, sperm motility is nowadays considered the best biomarker for fish spermatozoa. The first scientific reports focusing on fish sperm motility date from a century ago, but the objective assessment allowed by computer-aided sperm analysis CASA-Mot systems was not applied to fish species until the mids. Since then, a high number of sperm kinetic parameters from more than fish species have been reported in more than scientific articles, covering a wide range of topics, such as sperm physiology, sperm storage, broodstock management, the phenomenon of sperm competition, ecotoxicology and understanding the life cycle of the species.