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BETTAS by Jim Sonnier

BETTA GENETICS page 7...

GIANT BETTAS

Half-Giant Green Marble Plakat male (fish by Wasan Sattayapun, photo by Jim Sonnier)

At the Orlando IBC Convention in June, 2002 several very large Bettas were shown in class G4, Form and Finnage. There were two about 7 inches long and three or four about 3.5 inches long. Gene Lucas called the larger ones, "Two-pounders!" A couple were long-finned but most of them were short-finned Plakats. The picture above shows the 4.5 inch one I purchased at the auction after the show.

I spawned him to a regular sized Plakat female (spawn#111002) and was rewarded with about 50% Half-Giants (3.5 inch) and about 50% regular sized offspring. Some photos of the offspring can be seen here.

Interestingly some of the Half-Giant offspring showed early rapid growth while only a couple looked normal until about 8 months of age and then had a growth spurt to Half-Giant size. All, however, had voracious appetites and ate much more food than their regular sized siblings. Some of the fully grown Half-Giant offspring are shown below.

Based on my limited observations to date I am thinking that the Giant condition is controlled by a single pair of mutated genes. It appears that offspring receiving both Giant genes from their parents should grow to about 7 inches in length. And it follows that heterogeneous offspring receiving only one Giant gene from their parents should grow to a length of about 3.5 inches. See the table below for expected results from spawnings with Giant Bettas.

Giant Spawnings (projected)
male parent female parent offspring
Giant(7") Giant(7") 100% Giant(7")?
Giant(7") Half-Giant(3.5") 50% Giant(7"), 50% Half-Giant(3.5")?
Regular Size(2+") Half-Giant(3.5") 50% Regular Size(2+"), 50% Half-Giant(3.5")
Half-Giant(3.5") Half-Giant(3.5") 25% Giant(7"), 50% Half-Giant(3.5"), 25% Regular Size(2+")?

 

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This page was last updated on 02/05/13

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