Navigation Links
Low oxygen in coastal waters impairs fish reproduction
Date:9/2/2007

PORT ARANSAS, TexasLow oxygen levels in coastal waters interfere with fish reproduction by disrupting the fishes hormones, a marine scientist from The University of Texas at Austin Marine Science Institute has found.

Incidents of seasonal low levels of oxygen, known as hypoxia, have increased dramatically in coastal waters throughout the world over the past few decades, largely as a result of increased run-off from human agricultural and industrial activities. Hypoxias long-term impact on marine animal populations is unknown.

Dr. Peter Thomas found that both male and female fish collected from seasonally hypoxic waters in Floridas Pensacola Bay estuaries had little ovarian and testicular growth, low egg and sperm production, and low levels of reproductive hormones during a time a year when they would normally be increasing in preparation for reproduction.

This study provides the first clear evidence that a wild population of estuarine fish has experienced reproductive impairment through hypoxia, said Thomas, professor of marine science. We rarely find such a dramatic reproductive impairment in both male and female fish collected from degraded environments, such as those contaminated with pollutants.

Thomas research was published online this week in Proceedings of the Royal Society B.

Laboratory studies showed that hypoxia caused endocrine disruption through decreasing levels in the brain of a chemical important for brain function called serotonin. The decrease in serotonin was caused by a decrease in an enzyme that plays a role in the serotonin synthesis pathway.

Atlantic croaker is one of the most common inshore fish species along the coasts of the southeastern Atlantic Ocean and Gulf of Mexico, and Thomas said that the croaker is representative of many inshore fish.

This study suggests that when persistent coastal hypoxia occurs, there is a potential long-term threat to fish populations and fishery resources, said Thomas. With worldwide increases in hypoxia, its something we must be concerned about, because so many people rely on fishing for their livelihood.

Thomas future studies will aim to further elucidate the effects of hypoxia on fish endocrine and reproductive systems at the molecular level. He is also pursuing similar work on reproductive impairment in croaker from hypoxic waters surrounding the so-called Dead Zone off the coast of Louisiana, which is an area of almost no oxygen that this year covered 7,900 square miles.


'/>"/>
Contact: Dr. Peter Thomas
thomas@utmsi.utexas.edu
361-749-6768
University of Texas at Austin
Source:Eurekalert

Related biology news :

1. Plant hemoglobins: Oxygen handlers critical for nitrogen fixation
2. Why do insects stop breathing? To avoid damage from too much oxygen, say researchers
3. Yeast Network Prevents Damage By Oxygen Radicals
4. Low oxygen likely made Great Dying worse, greatly delayed recovery
5. Oxygen increase caused mammals to triumph, researchers say
6. Hopkins researchers discover genetic switch that turns off an oxygen-poor cells combustion engine
7. Dont hold your breath: Carp can manage without oxygen for months
8. Heart has enough oxygen to survive hypothermia, CPR crucial
9. Steep oxygen decline halted first land colonization by Earths sea creatures
10. Technology for monitoring fetal oxygen during labor offers no apparent benefit
11. Giant insects might reign if only there was more oxygen in the air
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/29/2017)... 2017  higi, the health IT company that operates ... America , today announced a Series B investment ... EveryMove. The new investment and acquisition accelerates higi,s strategy ... transform population health activities through the collection and workflow ... higi collects and secures data today on behalf of ...
(Date:3/27/2017)... N.Y. , March 27, 2017  Catholic ... Information and Management Systems Society (HIMSS) Analytics for ... EMR Adoption Model sm . In addition, CHS ... of U.S. hospitals using an electronic medical record ... for its high level of EMR usage in ...
(Date:3/24/2017)... Mar 24, 2017 Research and Markets has ... Market Analysis & Trends - Industry Forecast to 2025" report ... ... at a CAGR of around 15.1% over the next decade to ... report analyzes the market estimates and forecasts for all the given ...
Breaking Biology News(10 mins):
(Date:10/10/2017)... , Oct. 10, 2017 SomaGenics announced the ... NIH to develop RealSeq®-SC (Single Cell), expected to be ... small RNAs (including microRNAs) from single cells using NGS ... the need to accelerate development of approaches to analyze ... "New techniques for measuring levels of mRNAs ...
(Date:10/10/2017)... ... October 10, 2017 , ... The Pittcon Program ... honoring scientists who have made outstanding contributions to analytical chemistry and ... 2018, the world’s leading conference and exposition for laboratory science, which will be ...
(Date:10/9/2017)... ... , ... The award-winning American Farmer television series will feature 3 Bar Biologics ... at 8:30aET on RFD-TV. , With global population estimates nearing ten billion people ... to feed a growing nation. At the same time, many of our valuable resources ...
(Date:10/9/2017)... ... October 09, 2017 , ... The ... medical marijuana products targeting the needs of consumers who are incorporating medical marijuana ... place in Phoenix, Arizona. , As operators of two successful Valley dispensaries, The ...
Breaking Biology Technology: