Navigation Links
UBC researcher gives first-ever estimate of worldwide fish biomass and impact on climate change
Date:1/15/2009

Are there really plenty of fish in the sea? University of British Columbia fisheries researcher Villy Christensen gives the first-ever estimate of total fish biomass in our oceans: Two billion tonnes.

And fish play a previously unrecognized but significant role in mitigating climate change by maintaining the delicate pH balance of the oceans, according to a study published in tomorrow's edition of the journal Science, co-authored by Christensen and a team of international scientists.

"By drinking salt water, fish ingest a lot of calcium, which needs to be removed or they will get renal stones," says Christensen, an associate professor in the UBC Fisheries Centre.

The team discovered that fish do this by binding the calcium to bicarbonate, and then excreting it as pellets of calcium carbonate, a chalk-like substance also known as "gut rocks," in a process completely separate from food digestion. For an animation of this process, visit www.publicaffairs.ubc.ca/download.

As the calcium carbonate from these pellets dissolves, it turns the seawater more alkaline, which has relevance for ocean acidification, and is impacted by the ocean's exchange of carbon dioxide (CO2) with the atmosphere.

To gauge the global impact of this process, Christensen and Simon Jennings from the UK's Centre for Environment, Fisheries and Aquaculture Science took two entirely different approaches to estimate the total biomass of fish in the world's ocean.

Jennings examined global ocean plant production and its efficiency as it moves through the food chain, while Christensen tallied global fish catches since 1950 and calculated how much fish there must have been in the oceans to support fisheries. The two approaches resulted in a close range of numbers: 0.8 to 2 billion tonnes.

"This study really is the first glimpse of the huge impact fish have on our carbon cycle and why we need them in the ocean," says Christensen. "We must buck the current trend of clear-cutting of the oceans and foster these unrecognized allies against climate change."


'/>"/>

Contact: Brian Lin
brian.lin@ubc.ca
604-822-2234
University of British Columbia
Source:Eurekalert

Related biology news :

1. Researchers identify proteins involved in new neurodegenerative syndrome
2. Texas researchers and educators head for Antarctica
3. MGH researchers describe new way to identify, evolve novel enzymes
4. University of Pennsylvania researchers develop formula to gauge risk of disease clusters
5. University of Oregon researcher finds that on waters surface, nitric acid is not so tough
6. U of MN researchers discover noninvasive diagnostic tool for brain diseases
7. U of Minnesota researchers discover noninvasive diagnostic tool for brain diseases
8. Researchers discover new strategies for antibiotic resistance
9. Researchers find new taste in fruit flies: carbonated water
10. Binghamton University researchers investigate evolving malaria resistance
11. Antioxidant to retard wrinkles discovered by Hebrew University researcher
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/12/2016)... WearablesResearch.com , a brand of Troubadour Research & ... Q1 wave of its quarterly wearables survey. A particular ... a program where they would receive discounts for sharing ... "We were surprised to see that so many ... CEO of Troubadour Research, "primarily because there are segments ...
(Date:4/28/2016)... and BANGALORE, India , April ... EdgeVerve Systems, a product subsidiary of Infosys (NYSE: ... today announced a global partnership that will provide ... to use mobile banking and payment services.      ... a key innovation area for financial services, but it also ...
(Date:4/26/2016)... -- Research and Markets has announced the ...  report to their offering.  , ,     (Logo: ... forecast the global multimodal biometrics market to grow ... 2016-2020.  Multimodal biometrics is being implemented ... healthcare, BFSI, transportation, automotive, and government for controlling ...
Breaking Biology News(10 mins):
(Date:5/26/2016)... ... May 26, 2016 , ... FireflySci ... used in leading laboratories all over the globe. Their cute firefly logo has ... manufacturing awesome cuvettes, FireflySci makes spectrophotometer calibration standards that never require recalibration. ...
(Date:5/25/2016)... ... May 25, 2016 , ... The Ankle Plating System 3 ... to address fractures of the distal tibia and fibula. This system marks Acumed's ... System 3 is composed of seven plate families that span the lateral, medial, ...
(Date:5/25/2016)... ... 2016 , ... Scientists at the University of Athens say they have evidence ... hampering the research that could lead to one good one. Surviving Mesothelioma has just ... , The team evaluated 98 mesothelioma patients who got a second ...
(Date:5/25/2016)... ... May 25, 2016 , ... Biohaven Pharmaceutical ... (FDA) has granted the company’s orphan drug designation request covering BHV-4157 for the ... granted by the FDA. , Spinocerebellar ataxia is a rare, debilitating neurodegenerative ...
Breaking Biology Technology: