Abstract
Our objective was to determine if a simple, rapid, non-interventive technique for sexing premature salmonids is possible. Analysis of skin mucus specimens from premature coho salmon sampled up to 8 months prior to spawning revealed vitellogenin, a female-specific protein. The occurrence was coincident with the initial development of the female gonads. The concentration of vitellogenin in the mucus was increased and readily discernible when female gonad weight was > 1% and < 6% of body weight, some 4–5 months prior to spawning. Therefore, a simple, rapid, non-interventive technique for sex determination of premature salmon that can be used by fish farmers, ranchers and hatchery biologists may be possible.
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