Inhibitory effect of K+ ions and influence of other ions and osmolality on the spermatozoa motility of European burbot (Lota lota L.)

PloS One
Katarzyna Dziewulska, Malwina Pilarska

Abstract

In fish with external fertilization, two main start-up mechanisms of the path that blocks or activates the spermatozoan motility apparatus are known. The main factor managing the path is osmolality or potassium ion. In burbot from the European and North American population, contradictory findings regarding the factors influencing the onset of spermatozoa motility were reported. The objective of the current study was to determine the effect of potassium and osmolality on the spermatozoa activation of European burbot, Lota lota (Actinopterygii, Gadiformes, Lotidae). Moreover, the influence of pH, as well as sodium ion concentrations on spermatozoa motility was investigated. Seven parameters characterising motility were traced by means of computer-assisted sperm analysis (CASA). The spermatozoa of European burbot are K+ ion-sensitive. A 6-mM KCl solution significantly decreased motility, and above 12-mM (50 mOsm kg-1) totally ceased spermatozoa movement. Sucrose and Na+ solutions inhibited spermatozoa movement only at concentrations > 450-480 mOsm kg-1. Greater differences in the percentage of motile sperm between individuals were noted in solutions containing high concentrations of chemicals triggering sperm motility. The optimum...Continue Reading

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Software Mentioned

Statistica
Sperm Class Analyzer ( SCA )

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