I will check but my guess is those hybrids will have skewed male /female ratios. Some lepomis crosses don't but GSF - BG do.

From Childers
Hubbs & Hubbs (1933) reported that in Michigen F1 hybrids of bluegills, green sunfish, longear sunfish, pumpkinseeds, and orangespotted sunfish were unable to reproduce because males were sterile and ova stripped from the few adult females used in the experiments appeared distinctly abnormal. This study, often cited in the literature, has resulted in a rather widespread belief that all male hybrid sunfish are sterile. Results of my experiments conclusively establish that a number of different kinds of hybrid sunfishes produced in Illinois are not sterile, are fully capable of producing abundant F2 and F3 generations, and can be successfully backcrossed to parent species and even outcrossed to nonparental species.


Triploid progeny of pumpkinseed X green sunfish hybrids
1. Robert M. Dawley,
2. John H. Graham and
3. R. Jack Schultz
+ Author Affiliations
1. Two of the authors (R.M.D. and R.J.S.) are affiliated with the Biological Sciences Group, the University of Connecticut, Storrs, CT 06268 and one (J.H.G.) with the Department of Biological Sciences, Rutgers University, Piscataway, NJ 08854. The current address of Dr. Dawley is Division of Biological Sciences, Section of Ecology and Systematics, Cornell University, Ithaca, NY 14853. The authors gratefully acknowledge the help of Walter Whitworth for assistance in developing this project, Robert C. Vrijenhoek for use of his laboratory facilities that are currently funded in part by the National Science Foundation (NSF BSR82-12150), and Ellen Dawley, Kentwood Wells, and an anonymous reviewer for comments on the manuscript. Research was supported by the Biological Sciences Group of the University of Connecticut and by grants to the senior author from the Raney Fund of the American Society of Ichthyologists and Herpetologists and the Theodore Roosevelt Memorial Fund of the American Museum of Natural History.
Abstract
Female pumpkinseed X green sunfish hybrids from Hall's Pond, Connecticut, were backcrossed to male pumpkinseed and male green sunfish. Offspring from these crosses are triploid and starch-gel electrophoresls shows they carry a double dose of the maternal genome. Thus, the female hybrids must produce unreduced, diploid eggs that are subsequently fertilized to yield triploid progeny. This is similar to the situation in parthenogenetic and gynogenetic vertebrates, where unreduced gametes are produced that develop, without fertilization, into female clones. However, because the fertilized eggs of the female sunfish yield sterile triploids, a self-perpetuating diploid unisexual “species” has not arisen from these hybrids.
© 1985, American Genetic Association


Asymmetric hybridization between two species of sunfishes (Lepomis: Centrarchidae)
Authors
• B. R. KONKLE, and D. P. PHILIPP

Abstract
Many of the sunfishes (Centrarchidae) hybridize in natural systems, yet little is known about the interactions among hybridizing individuals in nature. We used allozyme electrophoresis to identify interspecific hybrids between bluegill (Lepomis macrochirus) and pumpkinseed (L. gibbosus) in Lake Opinicon, Ontario, and restriction fragment length polymorphism analysis of mitochondrial DNA (mtDNA) to identify the maternal parentage of those individuals. All 44 individuals collected and identified electrophoreti-cally as F1 hybrids had a pumpkinseed mtDNA haplotype, indicating that hybridization between these species in Lake Opinicon is asymmetrical; F1 hybrids result only from matings between female pumpkinseed and male bluegill.


Last edited by ewest; 08/24/16 12:29 PM.