Abstract
Abstract Attempts to backcross F1 male bluegill (Lepomis macrochirus) x green sunfish (Lepomis cyanellus) hybrids with females of each parental species were unsuccessful both in ponds and in the laboratory. In laboratory experiments, fertilization was accomplished but embryos failed to survive longer than 36 h. In ponds, nesting and courting activity were observed but successful reproduction did not occur. Additionally, 1,874 of 1,983 F1 hybrids examined (94.5%) were males.
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