Females Finessed By Fishy Fellatio

Researchers from Konstanz University in Germany have identified a gene in male cichlid fish that evolved to lure female fish into close proximity so that the male can deposit sperm in the female’s mouth. The study, in BMC Biology, reveals that the gene is responsible for egg-like markings on the fin which are central to the success of the fishes’ exotic oral mating behavior.

Researchers Walter Salzburger, Ingo Braasch and Axel Meyer identified the gene involved in producing the yellow spots on the fishes’ fins. These markings, known as “egg-dummies,” are found on the anal fins of the male fish. The fish are known as maternal mouth-brooders, because once the female has laid her eggs, she picks them up in her mouth.

Attracted by what she takes to be eggs – actually the egg-dummy markings – the female then approaches the male. When the female is close enough, the male discharges his sperm into the female’s mouth to fertilize the real eggs.

The study notes that there are more than 1,800 cichlid species and more than 80 percent of these belong to a grouping known as the haplochromines, which exhibit the characteristic egg dummies.

The gene that is involved in producing the fake egg markings is called the colony-stimulating factor 1 receptor a (or csf1ra). The researchers also showed that the gene was expressed in the egg-dummies of a distantly related species, in which the spots developed on the pectoral fins rather than the anal fins. “The two kinds of independently evolved egg-dummies serve as a model system to test whether the same genetic pathways are involved in the morphogenesis of both types of dummies,” say the authors.

Related articles:
Honey, I Ate The Kids
For Some Females, Size Does Matter
Promiscuous Females Make For Competitive Sperm

Source: BioMed Central
Pic courtesy Erwin Schraml

, ,

Comments are closed.

4.5 in Handmade Vibrant Red Monarch Frog Mate Tobacco Smoking Bowl Glass Pipes picture

4.5 in Handmade Vibrant Red Monarch Frog Mate Tobacco Smoking Bowl Glass Pipes

$12.79



SALE Tupperware 18 C Modular Mate Rectangle2 Storage Containerw/Seal New Black picture

SALE Tupperware 18 C Modular Mate Rectangle2 Storage Containerw/Seal New Black

$23.74



Tupperware 8.5 Cup Modular Mate Rectangle #1 Storage Container w/Seal New Black picture

Tupperware 8.5 Cup Modular Mate Rectangle #1 Storage Container w/Seal New Black

$23.99



Camo Natural Leaf Herbal Wraps Variety Sampler 11/5ct Packs Chamomile&Mate 55pc picture

Camo Natural Leaf Herbal Wraps Variety Sampler 11/5ct Packs Chamomile&Mate 55pc

$19.99



Ballpoint Pen Refills to Fit Paper Mate Lubriglide, Aspire, PhD, Medium Point picture

Ballpoint Pen Refills to Fit Paper Mate Lubriglide, Aspire, PhD, Medium Point

$15.95



Tupperware All In One Mate set picture

Tupperware All In One Mate set

$12.99



5 PACKS CAMO NATURAL LEAF WRAPS -RUSSIAN CREAM - 25 SHEETS HERBAL CHAMOMILE MATE picture

5 PACKS CAMO NATURAL LEAF WRAPS -RUSSIAN CREAM - 25 SHEETS HERBAL CHAMOMILE MATE

$9.88



MARBLES First Mate Stainless Handle Marlin Spike Folding Pocket Knife 405 picture

MARBLES First Mate Stainless Handle Marlin Spike Folding Pocket Knife 405

$15.84



5 Black Medium Ballpoint Refill for Paper mate Lubriglide, Aspire, PhD Pen picture

5 Black Medium Ballpoint Refill for Paper mate Lubriglide, Aspire, PhD Pen

$15.95



Vintage US Merchant Marine 2nd Mate USMS USNAG With Beautiful French Girl picture

Vintage US Merchant Marine 2nd Mate USMS USNAG With Beautiful French Girl

$14.99



Powered by WordPress. Designed by WooThemes