Scientists have recently discovered that the disc fish surprisingly attentive parents. It is known that small colored creations feed their offspring nutritional mucus, located on their skin.
Now, the analysis revealed that the tropical fish really excommunicate their fry from such feeding, "helping" to ensure that he learned to look for themselves their own food, and this feature in the cultivation of fish seed disk has a lot to do with the behavior of mammals.
The researchers describe the behavior of fish in the Journal of Experimental Biology.
This distinctive circular seed-feeding fish - a well-known fact of their behavior, but for the first time studied in detail.
The analysis was conducted by Dr. Jonathan Buckley (Jonathan Buckley) from the University of Plymouth in the UK.
He and his colleagues found that when it comes time to take care of the fry, circular fish are more like mammals than with most other types of fish.
He explained: "In the first few weeks when the fry were born, parents begin amazingly good care of them." The skin of both parents covered in slime, kids and parents are constantly surrounded by pecking at her.
At this stage, the small, vulnerable juveniles can not live apart, and therefore inseparable from their parents. Males and females even share parental responsibility, moving children from one parent to another, when they need to absent himself for his own feeding.
Dr. Buckley compared the fish to mammals, nursing their young.
He and his research team have now confirmed a striking similarity between the way the care of their offspring during feeding fish and how do mammals.
He told BBC News, the BBC, that after the first two weeks, the parents begin to intentionally put out the fry from the slime. "During the third week of the changes taking place - the parents are constantly sail away from the kids" - explained Dr. Buckley.
"We think this is the beginning of the period to absent themselves - they are aggressively trying to stop feeding the fry and teach themselves to produce their own food."
When the researchers examined the very goo, they were found to contain antibodies - substances that support the immune system. "This transfer of antibodies by feeding their offspring is the initial sign of parental care mammals and non-observed previously in fish" - said Dr Buckley.
These data show the extent to which kind of fish is underestimated in terms of their behavior. The research could also help explain how the fish may be exposed to contamination of the Amazon, the environment in which it lives.
Pollutants, especially from mining, fall into the water of the river, and scientists think that they can be absorbed into the mucus and subsequently transmitted to the offspring.
"The catch and sale of fish species is the main income for the people living in this part of Brazil" - said Dr Buckley. "So it is important to understand how the fish is exposed to changes in their environment."
Original: News Translation: M. Potter