I am going to present a phenomenon among fish. There is a species that maintain in our tanks but the news is no less interesting ...
A team of biologists from the University of Copenhagen, Denmark, have found a fish that breastfeeding their babies while they are embryos in the mother's body. Behavior never before seen in fish. But the breast of the way one can think of, but does so while they are developing inside the mother. Fish is
Zoarces viviparus. According to the researchers explain in the ournal of Experimental Marine Biology and Ecology ovarian follicles used for nursing developing fry. Gives birth to between 30 and 400 pups between 3 and 5 cm. long, a relatively large size big thanks to this phenomenon. Give birth in winter, when the waters are extremely cold.
Other fish such as guppy and molly, also give birth to well developed young. But they tend to have a short gestation of only a few weeks and embryos are supplied with a gestational sac within the mother's body.
"The exact mechanisms of development of young fish has been the subject of extensive investigations over the past half century"
says Professor Peter Skov, who led the study.
In mammals, ovarian follicles produce eggs that mature after as they move toward the uterus where fertilization occurs. Once in the uterus, the embryo obtains nutrients and oxygen in the placenta through the umbilical cord after birth and continues to feed through breastfeeding.
"In the eelpout, the egg is also produced and matured in the ovary with follicles, as in mammals. But fertilization, and the entire gestational period, takes place right there because these fish have utero
the BBC explains Professor Skov. The
Zoarces viviparus, the egg is also produced and matured in the ovary with follicles, as happens in mammals, but fertilization and throughout the gestational period are carried out there, because these fish have no uterus. Some time later, just spending the reserves of the managerial sack and small fish attach their mouths to ovarian flículo, which has a channel on its tip through which liquid flows and nutrients.
These fluids are rich in proteins, acids and glucose. They also bring oxygen to the gills of small fish were properly conducted.
Each embryo is attached to a follicle unique.
"This ensures an equal distribution of nutrients"
says the professor.
Scientists conducted the discovery by accident while investigating the physiology of this fish. Skov
professor was doing a dissection of a pregnant female was found dead when the embryos attached to the ovarian follicles.
"We were totally surprised by this finding,"
"Our work changes what we knew about the reproduction of Zoarces, and perhaps also applies to other fish
lives near coastal waters in large parts of Europe from the Channel to the Baltic Sea and White Sea in the Arctic Ocean. They have one of the longest pregnancy in fish, which can last 6 months.
Habitat eelpout
Well then I hope you have been surprised and soon another new post! Be attentive and thanks for staying here.
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