Navigation Links
Growing hypoxic zones reduce habitat for billfish and tuna
Date:12/22/2010

Billfish and tuna, important commercial and recreational fish species, may be more vulnerable to fishing pressure because of shrinking habitat, according to a new study published by scientists from NOAA, The Billfish Foundation, and University of Miami Rosenstiel School of Marine and Atmospheric Science.

An expanding zone of low oxygen, known as a hypoxic zone, in the Atlantic Ocean is encroaching upon these species' preferred oxygen-abundant habitat, forcing them into shallower waters where they are more likely to be caught.

During the study, published recently in the journal Fisheries Oceanography, scientists tagged 79 sailfish and blue marlin with satellite tracking devices in the western North Atlantic, off south Florida and the Caribbean; and eastern tropical Atlantic, off the coast of West Africa. The pop off archival satellite tags monitored horizontal and vertical movement patterns. Researchers confirmed that billfish prefer oxygen rich waters closer to the surface and will actively avoid waters low in oxygen.

While these hypoxic zones occur naturally in many areas of the world's tropical and equatorial oceans, scientists are concerned because these zones are expanding and occurring closer to the sea surface, and are expected to continue to grow as sea temperatures rise.

"The hypoxic zone off West Africa, which covers virtually all the equatorial waters in the Atlantic Ocean, is roughly the size of the continental United States, and it's growing," said Dr. Eric D. Prince, NOAA's Fisheries Service research fishery biologist. "With the current cycle of climate change and accelerated global warming, we expect the size of this zone to increase, further reducing the available habitat for these fish."

Less available habitat can lead to more fish being caught since the fish are concentrated near the surface. Higher catch rates from these areas may give the false appearance of more abundant fish stocks. The shrinking availability of habitat and resulting increases to catch rates are important factors for scientists to consider when doing population assessments.

Researchers forecast that climate change and its associated rise in ocean temperatures will further increase the expansion of hypoxic zones in the world's oceans. As water temperature increases, the amount of oxygen dissolved in water decreases, further squeezing billfish into dwindling available habitat and exposing them to even higher levels of exploitation.


'/>"/>

Contact: Karrie Carnes
karrie.carnes@noaa.gov
727-551-5750
NOAA Headquarters
Source:Eurekalert  

Related biology news :

1. Gene discovery suggests way to engineer fast-growing plants
2. This faster-growing E. coli strains a good thing
3. Growing sorghum for biofuel
4. Global Obesity Summit 2010 in Jackson addresses growing epidemic at ground zero
5. Growing crops in the city
6. The effects of hydrogen on growing carbon nanotubes
7. New VARI findings next step to growing drought-resistant plants
8. UM School of Medicine Center for Celiac Research finds rate of celiac disease is growing
9. With growing US support for personalized medicine, a look at ethical dilemmas
10. Gene discovery holds key to growing crops in cold climates
11. Growing drought-tolerant crops inching forward
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Growing hypoxic zones reduce habitat for billfish and tuna
(Date:1/6/2017)... , Jan. 5, 2017  SomaLogic announced ... "Digital Life Alliance" established by iCarbonX, the ... to build a "Global Digital Health Ecosystem that ... a combination of individual,s biological, behavioral and psychological ... agreement between the companies, SomaLogic will provide proteomics ...
(Date:1/4/2017)... 4, 2017  CES 2017 – Valencell , ... today announced the launch of two new versions ... highly-accurate biometric sensor modules that incorporate the best ... and expertise. The two new designs include Benchmark ... hearables, and Benchmark BW2.0, a 2-LED version of ...
(Date:12/22/2016)... , December 22, 2016 SuperCom ... of secure solutions for the e-Government, Public Safety, HealthCare, and Finance ... of SuperCom, has been selected to implement and deploy a community-based ... Northern California , further expanding its presence in ... This ...
Breaking Biology News(10 mins):
(Date:1/20/2017)... -- http://www.Financialbuzz.com - According to ... of death worldwide. There were 8.2 million cancer related ... deaths increased gradually over time, the death rates have ... cancers continues to drive demand of biological therapies for ... Insights, Inc. cancer biological therapy market size was USD 61.3 ...
(Date:1/19/2017)... 2017 Research and Markets has announced the ... Cancer Type, Application - Global Opportunity Analysis and Industry Forecast, 2014-2022" ... ... market is projected to reach $15,737 million by 2022 from $6,521 ... 2022. Omic technologies segment accounted for more than ...
(Date:1/19/2017)... and HOUSTON , Jan. 19, ... today announced the formation of its Medical/Clinical Advisory ... and industry veterans who enhance the range and ... accelerates development of its novel prenatal diagnostic tests.  ... clinical and strategic guidance for the company,s product ...
(Date:1/19/2017)... and Markets ... addition of the "Implantable Biomaterials Market Analysis & ... to their offering. Report Highlights: ... current and future market trends to identify the investment opportunities ... numbers Key market trends across the business segments, Regions ...
Breaking Biology Technology: