Navigation Links
Fish biomass in the ocean is 10 times higher than estimated
Date:2/7/2014

With a stock estimated at 1,000 million tons so far, mesopelagic fish dominate the total biomass of fish in the ocean. However, a team of researchers with the participation of the Spanish National Research Council (CSIC) has found that their abundance could be at least 10 times higher. The results, published in Nature Communications journal, are based on the acoustic observations conducted during the circumnavigation of the Malaspina Expedition.

Mesopelagic fishes, such as lantern fishes (Myctophidae) and cyclothonids (Gonostomatidae), live in the twilight zone of the ocean, between 200 and 1,000 meters deep. They are the most numerous vertebrates of the biosphere, but also the great unknowns of the open ocean, since there are gaps in the knowledge of their biology, ecology, adaptation and global biomass.

During the 32,000 nautical miles traveled during the circumnavigation, the researchers of the Malaspina Expedition (a project led by CSIC researcher Carlos Duarte) took measurements between 40N and 40S, from 200 to 1,000 meters deep, during the day.

Duarte states: "Malaspina has provided us the unique opportunity to assess the stock of mesopelagic fish in the ocean. Until now we only had the data provided by trawling. It has recently been discovered that these fishes are able to detect the nets and run, which turns trawling into a biased tool when it comes to count its biomass".

Transport of organic carbon

Xabier Irigoyen, researcher from AZTI-Tecnalia and KAUST (Saudi Arabia) and head of this research, states: "The fact that the biomass of mesopelagic fish (and therefore also the total biomass of fishes) is at least 10 times higher than previously thought, has significant implications in the understanding of carbon fluxes in the ocean and the operation of which, so far, we considered ocean deserts".

Mesopelagic fish come up at night to the upper layers of the ocean to feed, whereas they go back down during the day in order to avoid being detected by their predators. This behaviour speeds up the transport of organic matter into the ocean, the engine of the biological pump that removes CO2 from the atmosphere, because instead of slowly sinking from the surface, it is rapidly transported to 500 and 700 meters deep and released in the form of feces.

Irigoyen adds: "Mesopelagic fish accelerate the flux for actively transporting organic matter from the upper layers of the water column, where most of the organic carbon coming from the flow of sedimentary particles is lost. Their role in the biogeochemical cycles of ocean ecosystems and global ocean has to be reconsidered, as it is likely that they are breathing between 1% and 10% of the primary production in deep waters".

According to researchers, the excretion of material from the surface could partly explain the unexpected microbial respiration registered in these deep layers of the ocean. Mesopelagic fishes would act therefore as a link between plankton and top predators, and they would have a key role in reducing the oxygen from the depths of the open ocean.


'/>"/>

Contact: Alda Ólafsson
alda.olafsson@csic.es
0034-915-681-499
Spanish National Research Council (CSIC)
Source:Eurekalert  

Related biology news :

1. Chemical engineers at UMass Amherst find high-yield method of making xylene from biomass
2. The weight of nations: An estimation of adult human biomass
3. Denmark can triple its biomass production and improve the environment
4. Biomass characterization technology research highlighted in Industrial Biotechnology journal
5. Algae Biomass Organization hails new UCSD study showing saltwater algae viable for biofuels
6. Bering Sea study finds prey density more important to predators than biomass
7. Biomass analysis tool is faster, more precise
8. Biomass research collaboration seeks to improve biofuel efficiency, bio-products quality
9. 21st European Biomass Conference and Exhibition
10. Burning biomass pellets instead of wood or plants in China could lower mercury emissions
11. Biomass supply chains developed by VTT speed up use of bioenergy in Vietnam
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Fish biomass in the ocean is 10 times higher than estimated
(Date:4/13/2017)... April 13, 2017 UBM,s Advanced Design and ... will feature emerging and evolving technology through its 3D ... will run alongside the expo portion of the event ... and demonstrations focused on trending topics within 3D printing ... and manufacturing event will take place June 13-15, 2017 at ...
(Date:4/11/2017)... , April 11, 2017 No ... but researchers at the New York University Tandon ... of Engineering have found that partial similarities between ... systems used in mobile phones and other electronic ... The vulnerability lies in the fact ...
(Date:4/5/2017)... YORK , April 5, 2017 Today ... is announcing that the server component of the HYPR ... known for providing the end-to-end security architecture that empowers ... HYPR has already secured over 15 million ... makers including manufacturers of connected home product suites and ...
Breaking Biology News(10 mins):
(Date:4/24/2017)... ... April 24, 2017 , ... It is well established ... however, the broad application of this cellular target engagement concept to drug discovery ... Cell-based thermal stabilization assays are valuable methods for particular applications, but they can ...
(Date:4/21/2017)... ... April 21, 2017 , ... The ... 10 categories with over 30 nominees and well as the first-year award for ... award and the event was hosted by CompanyWeek and Manufacturers Edge, among other ...
(Date:4/21/2017)... ... April 21, 2017 , ... ... Bank, today announced first round funding to three startups through the UConn Innovation ... support to new business startups affiliated with UConn. , The UConn Innovation Fund ...
(Date:4/21/2017)... ... April 21, 2017 , ... The AMA is happy to ... graduates from across the nation. The scholarships are created through funds donated by model ... Scholarship criteria are set by the AMA Scholarship Committee, which is made up of ...
Breaking Biology Technology: