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Original Post (Thread Starter)
#256325 04/26/2011 2:29 AM
by Bill Cody
Bill Cody
Hybrid bluegill (HBG) are widely available at warmwater fish farms & hatcheries. Some fish farms only sell hybrid bluegill and no pure strain bluegill (BG). This is more common at those fish farms in northern states. Read on for more information about HBG.

1. The most commonly available hybrid bluegill (HBG) is the result from cross breeding a bluegill (BG) and a green sunfish (GSF). Most often the male BG and female GSF are used by hatcheries for the genetic cross breeding. Hybrid BG can also occur with either species as male or female. First offspring from this hybridization are referred to as F1 generation or F1s. NOTE THERE IS NOW BECOMING AVAILABLE AS A DIFFERENT TYPE OF HYBRID BLUEGILL CALLED SPECKLEBELLY. THIS IS A CROSS OF BG AND REDEAR SUNFISH.

2. Hybrid bluegill are fertile, although most individuals are male. Percentage of males ranges from 66%-99% (often 80-95%)depending on the parent species. mBG (male BG) X fGSF (female green sunfish) is a common genetic cross for HBG and results in the higher percentage of males.

3. HBG (F1) produce relatively few offspring due primarily to the predominance of male fish and low numbers of females in each spawn of F1 fish. Very few offspring provides only a few forage fish for predators, thus predators do not grow very large when feeding primarily on HBG. Hybrid bluegill are not sterile. First generation of hybrid bluegill is mostly male with a low percentage being female. The female's eggs are fertilized by the males to produce some offspring. Each subsequent generation tends to produce more females. After several years usually lots of or numerous mixed genetic sunfish are produced each year. These hybrids can reproduce with the pure strain BG or with any willing fertile sunfish in the pond.

4. First offspring of HBG are referred to as F2 generation. Offspring of F2 generation fish are referred to as F3 generation. The F3 generation produces the F4 generation, etc. If pure strain bluegill or sunfish are available the F generation can breed with them. These offspring could be considered diluted stain bluegill or "some form of hybrid sunfish". Advanced discussion of this topic:
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=393700#Post393700

5. HBG (F1) have what is termed 'hybrid vigor' and reportedly have improved growth rate compared to either parent. This hybrid vigor produces fish that rapidly grow to harvestable size and are slightly larger than a similar age of bluegill or green sunfish. Many have reported that over time, pure strain bluegill can eventually surpass the size of HBG. This will depend on numerous factors such as food source and number of competing species i.e. competition among same and different species.

6. HBG are thought to be more aggressive than either parent. I am not positive that HBG are more aggressive than green sunfish. Green sunfish are pretty aggressive - always willing to bite a nearby baited hook, often even large baits. By observation HBG are usually definitely more aggressive than pure strain BG. The aggressive behavior and related feeding tendencies of the HBG probably contributes to its rapid growth rate.

7. Aggressiveness of HBG makes them in general more "easy" to catch compared to pure strain bluegill.

8. HBG readily accept and grow well on pellet foods.

9. Succeeding generations of HBG do not breed true and various mixed genetics of the parents will be exhibited. After many years of HBG inbreeding, the offspring can closely resemble either parent � IMO usually more outward traits of green sunfish.

10. Given the correct conditions, HBG will occasionally breed with pure bluegill, green sunfish, other sunfish or F hybrids if any of them are present. Resulting fish will have various combinations of genes and appearance based on the parentage and the genetic "blend".

11. HBG do not produce a lot of offspring primarily because a large percentage of the fish are male. Presence of only a few females results in fewer eggs laid. There are many predation forces on eggs and fry. This usually results in few surviving offspring especially if bass are present. Additional predation of small fingerling HBG usually results in very few new adult HBG recruited to the normal pond. Thus when a significant number of the original HBG stock are removed or die of old age, new HBG should be added to maintain 'good' numbers of adults. When adding new HBG and if LMB or other predators are present, HBG survival rates will be better if larger stockers are added.

12. Authors note. Contrary to what I have earlier mentioned several times on the PB Forum, not all HBG offspring, at least the F2's or F3's, grow slow, nor do they stay small, nor should they be considered trash fish. A pond owner in TX has collected, raised and monitored growth of F2 and F3 offspring from HBG (http://www.meadowlarkponds.com/TGG.htm). Growth rates and initial sizes of these F2 and F3 fish after 1-2 years were 'good' and sizes are similar to that of the F1's providing all fish were well fed. Not much is known and documented about later generations and individuals from various spawns F4, F5, F6, etc. Due to back crossing, these fish can have a higher percentage of BG or green sunfish (GSF) genetics and many times after many generations, most of the offspring will look like GSF or have a high percentage of GSF genes. My experience is that the later F generations often appear more like GSF because the GSF tends to be a more aggressive fish and it out competes those with a high degree of BG genetics thus more of the GSF survive to reproduce and survive. Other observations are welcome.

Readers are welcome to add more information or links to this thread.
LINKS to some topics about HBG:

Hybrid Sunfish Explained:
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=399554#Post399554

Basic Genetics of HBG Explained
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=474400#Post474400


HBG pic/question
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=256047&page=1

Good examples of HBG both BG X GSF and BG X RES showing both types
https://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=560177#Post560177


HBG-possible female
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=256265#Post256265

Here is a link to a thread that has an article and discussion about hybrid redear X green sunfish.
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=389103#Post389103

Discussion of bluegill hybrids (intergrades), RES, and growth of bass and forms of bluegill.
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=432446&page=1

Growth of HBG compared to 'regular' BG.
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=470751#Post470751

Good Forum Discussion about behavior and growth of BG - GSF - HBG
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=478569#Post478569
Liked Replies
#552970 Oct 22nd a 01:22 AM
by Bill Cody
Bill Cody
This is a 2022 update from Theo Gallus about his population of RES X BG hybrids. Thank you Mr. Gallus for your HBG advice and update.
""I'm in the middle of Ohio. One of my ponds has SMB, YP, a few CC, and a very healthy, larger than I want (in numbers, but growing impressive in size) population of BGxRES. The latter were not stocked as Specklebelly Sunfish, but are rather the result of adding about 4 dozen male only BG to a breeding population of RES in 2008-2011. There may still be some pure RES left in the pond, but I can't swear to it, as the BGxRES (now in Fx generations that have an interesting mix of characteristics) are much more aggressive wrt taking feed and being caught.

I find BGxRES to be wonderful IF you have the predators or time to control their numbers. My SMB/large YP/CC predation is not sufficient to keep the BGxRES numbers where I want them, so I remove about 500 BGxRES by angling every year from this 1/2 acre pond. (Roughly 1/4 to 1/3 of these are eating sized - 6 1/2" to 9"; I return all BGxRES 9" and larger, with a current BGxRES record of 13.25" and just over 2 1/2 pounds.)""

Here is a very good YouTue video about the best guess for identifying hybrid sunfish.
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