Which species hybridizes with S. vitreus to produce the fertile cross known as "saugeye"?
Answer
Sander canadensis (sauger)
The sauger, scientifically designated as *Sander canadensis*, is the species that shares the *Sander* genus with the walleye and is known to hybridize with *S. vitreus*. This cross results in a fertile hybrid offspring termed the "saugeye." This documented interbreeding underscores the extremely narrow genetic boundary separating these two species within the genus. Conversely, hybridization with other Percids, such as yellow perch, is generally not documented because they are separated by the broader genus boundary, reinforcing the importance of the *Sander* grouping as a significant reproductive isolating factor.

Related Questions
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