Navigation Links
Scientists discover how fish evolved to float at different sea depths

Scientists at the University of Liverpool have discovered how fish have evolved over the last 400 million years to stay motionless at different water depths.

A research team led by Dr Michael Berenbrink, a Comparative Physiologist at the School of Biological Sciences, has revealed how modern fish, such as pike and cod, have developed a way of floating at certain water levels using a gas-filled swimbladder.

Dr Berenbrink investigated the mechanism that allows fishes to keep the swimbladder inflated with gas even at great water pressure in the depths of the sea. The mechanism comprises of a complex system of arteries and veins, called the rete mirabile, and special blood proteins, which can release oxygen even at high oxygen concentrations.

These systems drive oxygen from the blood into the swimbladder allowing the fish to float at different levels in the sea without coming to the surface of the water for air. A similar system is also present in the eye of the fish, which provides oxygen to the retina.

Dr Berenbrink explains: "I am interested in how the mechanisms in the swimbladder and eye could have evolved. Some fish have no swimbladder and others fill it by swallowing air at the surface of the water. Another group of fishes has a closed swimbladder that is inflated through gas secretion even when they are in high water pressures. My aim was to find out how these systems came into place and how this allowed for the great variety of fishes we have in our oceans today."

The study revealed that the special blood proteins, which are essential for oxygen secretion, were present in the eye system 250 million years ago. This predated the swimbladder system by 100 million years. The special blood proteins induced development of the swimbladder system.

Dr Berenbrink continued: "Many researchers believe that the swimbladder evolved from a primitive lung, which can be traced back 400 million years. These findings will help us to understand the diversity and success of modern fishes in their environment."

Dr Berenbrink's research will be published in Science magazine on Friday, 18 March 2005.


'"/>

Source:University of Liverpool


Related biology news :

1. Scientists ID molecular switch in liver that triggers harmful effects of saturated and trans fats
2. Scientists Replicate Hepatitis C Virus in Laboratory
3. Scientists detect probable genetic cause of some Parkinsons disease cases
4. Scientists find missing enzyme for tuberculosis iron scavenging pathway
5. Scientists seek answers on what activates deadly anthrax spores
6. Yale Scientists Find MicroRNA Regulates Ras Cancer Gene
7. Scientists collaborate to assess health of global environment
8. Scientists decipher genome of fungus that can cause life-threatening infections
9. Scientists discover the cellular roots of graying hair
10. Scientists rid stem cell culture of key animal cells
11. Scientists develop new color-coded test for protein folding
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/22/2016)... June 22, 2016 On Monday, the Department ... industry to share solutions for the Biometric Exit Program. ... and Border Protection (CBP), explains that CBP intends to ... the United States , in order ... defeat imposters. Logo - http://photos.prnewswire.com/prnh/20160622/382209LOGO ...
(Date:6/20/2016)... DALLAS , June 20, 2016 ... criminal justice technology solutions for public safety, investigation, ... by the prisons involved, it has secured the ... Corrections (DOC) facilities for Managed Access Systems (MAS) ... (4) additional facilities to be installed by October, ...
(Date:6/15/2016)... , June 15, 2016 ... market report titled "Gesture Recognition Market by Application Market - Global ... 2016 - 2024". According to the report, the  global ... billion in 2015 and is estimated to grow ... 48.56 billion by 2024.  Increasing application ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... Hill, N.C. (PRWEB) , ... June 27, 2016 ... ... U.S. commercial operations for Amgen, will join the faculty of the University ... serve as adjunct professor of strategy and entrepreneurship at UNC Kenan-Flagler, with a ...
(Date:6/24/2016)... , June 24, 2016  Regular discussions on a ... take place between the two entities said Poloz. ... Ottawa , he pointed to the country,s ... the federal government. ... said, "Both institutions have common economic goals, why not sit ...
(Date:6/24/2016)... ... June 24, 2016 , ... Researchers at the Universita ... miRNAs in people with peritoneal or pleural mesothelioma. Their findings are the subject of ... now. , Diagnostic biomarkers are signposts in the blood, lung fluid or tissue ...
(Date:6/23/2016)... CAMBRIDGE, Mass. , June 23, 2016 /PRNewswire/ ... the development of novel compounds designed to target ... compound, napabucasin, has been granted Orphan Drug Designation ... in the treatment of gastric cancer, including gastroesophageal ... cancer stemness inhibitor designed to inhibit cancer stemness ...
Breaking Biology Technology: