Abstract
The Eagle Lake trout is a rainbow series trout inhabiting a Lahontan basin lake, where the Lahontan cutthroat trout would be expected to occur. The fish is thought to be descended from rainbow trout, or from a hybridization between rainbow and cutthroat trout, or rainbow and redband trout. Electrophoretic, karyotypic and meristic data argue against the cutthroat x rainbow hypothesis. The data are more equivocal concerning the other two hypotheses. Eagle Lake, rainbow and redband trout were found to be very similar electrophoretically. In addition, the Eagle Lake trout is similar to redband and some rainbow trout in having 58 chromosomes. Meristically, however, the Eagle Lake trout is similar to the rainbow and unlike the redband. Thus, the most plausible theory of origin of the Eagle Lake trout is the immigration or perhaps early introduction of a rainbow trout with 58 chromosomes.
Published Version
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