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:4/17/2017)... 17, 2017 NXT-ID, Inc. (NASDAQ: NXTD ... filing of its 2016 Annual Report on Form 10-K on Thursday ... ... available in the Investor Relations section of the Company,s website at ... website at http://www.sec.gov . 2016 Year Highlights: ...
(Date:4/11/2017)... Research and Markets has announced the addition of the ... ... to grow at a CAGR of 30.37% during the period 2017-2021. ... been prepared based on an in-depth market analysis with inputs from ... prospects over the coming years. The report also includes a discussion ...
(Date:4/5/2017)...  The Allen Institute for Cell Science today announces ... portal and dynamic digital window into the human cell. ... application of deep learning to create predictive models of ... a growing suite of powerful tools. The Allen Cell ... publicly available resources created and shared by the Allen ...
Breaking Biology News(10 mins):
(Date:9/14/2017)... ... September 14, 2017 , ... DrugDev ... biotech at the third annual DrugDev Summit, November 7-8, 2017 in Philadelphia, PA. ... most progressive clinical research leaders for best practice case studies, keynote presentations, lively ...
(Date:9/14/2017)... ... September 14, 2017 , ... AxioMed is pleased ... Australia. Dr. Steven Yang completed the procedure on a 35-year-old female patient suffering ... lumbar disc at level L5-S1. The patient failed conservative treatments prior to undergoing ...
(Date:9/14/2017)... , ... September 14, 2017 , ... ... Management and exploratory analytics solutions, today announced that its Anzo Smart Data Lake ... year, KMWorld’s list includes technologies and solutions that help organizations succeed in surpassing ...
(Date:9/12/2017)... ... September 12, 2017 , ... PhysIQ, a ... platform for ambulatory patient monitoring and clinical trial support, earned DPharm Idol 2017 ... in Boston. , Launched in 2005, PhysIQ leverages artificial intelligence (AI) to ...
Breaking Biology Technology: