Detecting fish species capable of

Scientists found that the males of a new fish in Mexico possessed a terrifying external genitalia, armed with four spikes, to help them rape the 'uncooperative' females .

This particular species of fish is identified as a freshwater llanos mosquitofish or Gambusia quadruncus. In the article describing this fish in the Fish Biology magazine, the team led by Brian Langerhan said that the spiny external genitalia of male fish is an unwanted mating mechanism. of female.

A male fish belongs to Gambusia fish species quadruncus and image
Its exaggerated external genitalia with 4 peculiar hook spikes.

'Normally, the reproductive process causes more loss in females, so females always seek to reduce mating with "lower inferior" males. Meanwhile, the breeding process is not harmful to males so they support the mating with as many children as possible , 'Mr. Langerhans explained.

The researcher added that, in the Gambusia quadruncus species, females with self-defense weapons are a large cell balloon, covering most of the genital holes. This means, children will have the right to decide whether to give the male 'sex,' unless the male has a response. The external genitalia with 4 spines can help the male overcome resistance and pinch the female genitalia, then release its sperm into the 'her' body. (The fertilization in the Gambusia genus fish takes place inside the female and female offspring).

Genital spikes are an anomaly that has been detected in fish. Phallostethus cuulong - another new species recently discovered in Vietnam - also has a genitals located below the head and shows a 'saw blade' to easily mate with the female. Researchers believe that the saw blade sticks out at the lower part of the male to 'attract a mate ' and help ensure successful fertilization.

In their report, researcher Langerhans also described another strange feature in the Gambusia quadruncus: The females have a flashy spot on their anal hole, apparently to inform the location of the birth hole. sex, reproductive status and species. In particular, species warning signs can help them reduce inter-species mating, creating hybrids.

Reference: Livescience