The Maladaptation of Trout Spermatozoa to Fresh Water

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A FEW years ago, when I was investigating sex-ratio in trout, some facts came to light which I intended to pursue further, but as there seems no opportunity at the moment of doing so, I feel it is worth putting them on record. Gray (Jour. Physiol., 53, 308; 1920) had already pointed out the remarkable fact that artificial insemination of trout eggs secured a much higher percentage of fertilised eggs than did natural fertilisation, and had shown that this was due to the extremely short time (1½–2½ minutes) for which the sperm remain active.

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