Rainbow trout, <i>Salmo gairdnerii</i> Richardson, spermatozoa: effects of cations and pH on motility

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<jats:p>Earlier work on the factors influencing inhibition of activation of the spermatozoa of <jats:italic>Salmo gairdnerii</jats:italic> has been confirmed. Diluents containing K<jats:sup>+</jats:sup> and of pH less than 7.8 do not activate the spermatozoa. The presence of Na<jats:sup>+</jats:sup> in the diluent has a mildly antagonistic effect on this inhibition. It has now been demonstrated that both Ca<jats:sup>2+</jats:sup> and Mg<jats:sup>2+</jats:sup> markedly antagonize the inhibition due to low pH and K<jats:sup>‐</jats:sup>. It is suggested that inhibition due to potassium salts could account for the inhibition previously attributed to Androgamone I.</jats:p>

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