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Blood Thicker Than Water: Guppy Fish With Same Father Inclined to Stay Together
Dr Jonathan Evans and Dr Jennifer Kelley, from the University of Western Australia, carried out the research.
According to a report by ABC News, research into the behavior of the guppy has found pairs of full-siblings spend significantly more time shoaling compared to pairs of half-sibling.
Shoaling, or crowding close together, is a common survival trait among fish.
The researchers artificially inseminated one group of female guppies with sperm from a single male and another with sperm from two males. They then observed the behavior of the offspring 24 hours after they were born.
Their results showed that offspring from a single sperm donor, spent more time shoaling and were closer together, than those from two donors.
The mean distance between each full-siblings within a shoal was 53.4 millimeter, compared to 68.4 millimeters for half-siblings.
Why full-siblings are more likely to shoal is not known, but according to Evans, it may be the result of some protective mechanism to avoid drawing attention.
"The more similar you are to other individuals in the group the less is your risk. You're better shoaling with like individuals so you're not the odd one out," he said.
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