Welcome   Sponsored By
Subscribe | Register | Advertise | Newsletter | About us | Contact us
   


Images of salts of elements being ionized for isotopic measurements in a Thermal Ionization Mass Spectrometer hosted in Ramananda Chakrabarti’s lab at

Fish ear bones can reveal seawater temperature millions of years ago

Click on the flag for more information about India INDIA
Friday, August 12, 2022, 07:00 (GMT + 9)

Researchers at the Indian Institute of Science (IISc) have now identified a way to estimate ancient seawater temperature by probing tiny bones in the ears of fish

Oceans cover three quarters of the earth's surface and host many remarkable life forms. Earth scientists have been attempting to reconstruct the seawater temperature over time, but it is not easy to do so.

Researchers at the Indian Institute of Science (IISc) have now identified a way to estimate ancient seawater temperature by probing tiny bones in the ears of fish. 

“When you go back in time, you don’t have any fossilised seawater,”
explained Ramananda Chakrabarti, Associate Professor at the Centre for Earth Sciences (CEaS), IISc, and corresponding author of the study published in Chemical Geology. Therefore, he and his PhD student, Surajit Mondal, in collaboration with Prosenjit Ghosh, Professor at CEaS, turned to otoliths – tiny bones found in the inner ear of fish. 

An IISc release explained: "Like corals, otoliths are made of calcium carbonate and grow throughout a fish’s lifetime by accumulating minerals from seawater. Similar to tree rings, these otoliths also hold clues to the fish’s age, migration patterns, and the type of water that the fish lived in."

For several years, Prof. Chakrabarti and his team have been tracking calcium carbonate deposits found in tiny animals like corals or foraminifera. In the current study, they chose otoliths as scientists have discovered fossilised otolith samples dating as far back as the Jurassic period (172 million years ago).

Sampling locations of fish otoliths which were analysed for Sr/Ca, Mg/Ca, Ba/Ca, and δ 44/40 Ca in this study (modified from Ghosh et al., 2007).

The release said researchers used six present-day otolith samples collected from different geographical locations along the east coast of North America. They analysed the ratio of different calcium isotopes in these otoliths with a Thermal Ionisation Mass Spectrometer (TIMS). By measuring the ratios of calcium isotopes in the sample, they were able to correlate it with the seawater temperatures from which the fish were collected.

(a) The δ 44/40 Ca values in fish otolith samples show a positive correlation (r 2 = 0.86, p < 0.07) with water temperature and negative correlations with (b)

“We demonstrated that calcium isotopes are a powerful tracer of water temperature, and Surajit’s efforts make our lab the only lab in the country that can actually measure these isotopic variations,” Prof. Chakrabarti was quoted as saying. In addition to calcium isotopes, the team also analysed the concentration of other elements like strontium, magnesium, and barium, and their ratios in the same sample, and collated the data together to tease out a more accurate value for seawater temperature within a range of plus or minus one degree Celsius when compared to the actual value. 

(a) A strong negative correlation (r 2 = 0.8, p < 0.05) between δ 44/40 Ca and Sr/Ca suggests that simultaneous measurements of these two parameters in fish otoliths can be used for reliable paleotemperature reconstruction. In contrast, δ 44/40 Ca values show poor correlations with (b) Mg/Ca (r 2 = 0.56, p = 0.1) and (c) and Ba/Ca (r 2 = 0.58, p = 0.3) ratios, which suggests that factors other than temperature have a dominant control on the Mg and Ba incorporation in fish otoliths. The correlations were calculated excluding the Black drum sample BIO-6. 

Organisms that live in the ocean are extremely sensitive to temperatures. A two-degree temperature rise could lead to the extinction of several species. In addition, because the atmosphere and the ocean are “on talking terms”, a lot of the carbon dioxide in the atmosphere eventually dissolves into the ocean, and this ability is also linked to seawater temperature – the lower the temperature, the more carbon dioxide is trapped.

Because of the close correlation they found between calcium isotope ratios and temperatures, the authors are confident that their approach can now be used on fossilised samples. Mapping early seawater temperatures is important to better understand Earth’s history, they say. “What happened back in time is key to our understanding of what will happen in the future,” Prof. Chakrabarti said.

Source: The Hindu

[email protected]
www.seafood.media


 Print


Click to know how to advertise in FIS
MORE NEWS
Iceland
Sep 28, 07:00 (GMT + 9):
Ground gear made to last
Russian Federation
Sep 28, 07:00 (GMT + 9):
Rosrybolovstvo allowed an increase in the production of aquaculture salmon by 2030 to 250 thousand tons
Chile
Sep 28, 07:00 (GMT + 9):
ILLEGAL FISHING AND MIGRATORY RESOURCES: ANALYSIS OF THE CHILEAN FISHING LAW
Namibia
Sep 28, 06:00 (GMT + 9):
Fishing company rejects concerns over catching in breeding grounds
United States
Sep 28, 02:40 (GMT + 9):
U.S. Coast Guard conducts high seas boarding for first time in the South Pacific Regional Fisheries Management Organization Convention Area
Worldwide
Sep 28, 01:20 (GMT + 9):
Javier Garat faces his eighth term at the head of the International Coalition of Fisheries Associations after being re-elected president
Japan
Sep 28, 00:40 (GMT + 9):
Volumes and Prices │ Frozen tuna │ Tokyo Central Fish Market │ 2021-2022
South Korea
Sep 28, 00:40 (GMT + 9):
Statistics │ Export │ Kanikama/Surimi │ by country │Aug-2022
United States
Sep 28, 00:30 (GMT + 9):
Situation of resources, quota and catches of Tanner crab (Chionoecetes bairdi) │ Bristol Bay | 2018-2023
United States
Sep 28, 00:30 (GMT + 9):
Snow crab (Chionoecetes opilio) of Bering Sea: Status of resources, quota and volume of catch │ 2018-2023
Canada
Sep 28, 00:00 (GMT + 9):
Other Media | Fish Farmer: Storm Fiona hammers Canadian east coast seafood sector
Russian Federation
Sep 28, 00:00 (GMT + 9):
Other Media | SalmonBusiness: Russia hopes to double farmed salmon production to 250,000MT by 2030
Republic of Ireland
Sep 28, 00:00 (GMT + 9):
Other Media | The Fishing Daily: McConalogue announces record €335 million allocation for seafood sector and coastal communities for 2023
Russian Federation
Sep 27, 07:10 (GMT + 9):
A plant for the production of fish feed with a capacity of 50 thousand tons will be built in Karelia
Australia
Sep 27, 07:00 (GMT + 9):
Industry veteran inducted into Seafood Industry Hall of Fame



Lenguaje
FEATURED EVENTS
  
TOP STORIES
'Gov’t provides funding to help deep sea fishing industry players': Minister Ronald
Malaysia The government is providing assistance, including funding through Agrobank, that can be used by deep sea fishing industry players to modernise vessels and fishing mechanisms, said Agriculture and Food...
ILLEGAL FISHING AND MIGRATORY RESOURCES: ANALYSIS OF THE ECUADOR FISHING LAW
Ecuador   The Aquaculture and Fisheries Law of Ecuador was sanctioned by Law of the National Assembly Official Reg. 187 of April 14, 2020.   The recitals of the Ecuadorian Fisheries Law are an ...
Lidl remains fastest growing grocery retailer as food inflation accelerates
United Kingdom Total Till sales growth slowed from +4.5% last month to +2.5% in the last four weeks ending 10th September as shoppers returned from holidays and reset spending patterns Lidl (+9.4%) remains th...
Indonesia explores strengthening of cooperation in fishery with Russia
Indonesia Jakarta (ANTARA) - Indonesia has explored efforts to strengthen cooperation with Russia in fishery product trade in an effort to increase its seafood export to Russia. "Indonesia has superior fi...
 

Maruha Nichiro Corporation
Nichirei Corporation - Headquarters
Pesquera El Golfo S.A.
Ventisqueros - Productos del Mar Ventisqueros S.A
Wärtsilä Corporation - Wartsila Group Headquarters
ITOCHU Corporation - Headquarters
BAADER - Nordischer Maschinenbau Rud. Baader GmbH+Co.KG (Head Office)
Inmarsat plc - Global Headquarters
Marks & Spencer
Tesco PLC (Supermarket) - Headquarters
Sea Harvest Corporation (PTY) Ltd. - Group Headquarters
I&J - Irvin & Johnson Holding Company (Pty) Ltd.
AquaChile S.A. - Group Headquarters
Pesquera San Jose S.A.
Nutreco N.V. - Head Office
CNFC China National Fisheries Corporation - Group Headquarters
W. van der Zwan & Zn. B.V.
SMMI - Sunderland Marine Mutual Insurance Co., Ltd. - Headquarters
Icicle Seafoods, Inc
Starkist Seafood Co. - Headquearters
Trident Seafoods Corp.
American Seafoods Group LLC - Head Office
Marel - Group Headquarters
SalMar ASA - Group Headquarters
Sajo Industries Co., Ltd
Hansung Enterprise Co.,Ltd.
BIM - Irish Sea Fisheries Board (An Bord Iascaigh Mhara)
CEFAS - Centre for Environment, Fisheries & Aquaculture Science
COPEINCA ASA - Corporacion Pesquera Inca S.A.C.
Chun Cheng Fishery Enterprise Pte Ltd.
VASEP - Vietnam Association of Seafood Exporters & Producers
Gomes da Costa
Furuno Electric Co., Ltd. (Headquarters)
NISSUI - Nippon Suisan Kaisha, Ltd. - Group Headquarters
FAO - Food and Agriculture Organization - Fisheries and Aquaculture Department (Headquarter)
Hagoromo Foods Co., Ltd.
Koden Electronics Co., Ltd. (Headquarters)
A.P. Møller - Maersk A/S - Headquarters
BVQI - Bureau Veritas Quality International (Head Office)
UPS - United Parcel Service, Inc. - Headquarters
Brim ehf (formerly HB Grandi Ltd) - Headquarters
Hamburg Süd Group - (Headquearters)
Armadora Pereira S.A. - Grupo Pereira Headquarters
Costa Meeresspezialitäten GmbH & Co. KG
NOAA - National Oceanic and Atmospheric Administration (Headquarters)
Mowi ASA (formerly Marine Harvest ASA) - Headquarters
Marubeni Europe Plc -UK-
Findus Ltd
Icom Inc. (Headquarter)
WWF Centroamerica
Oceana Group Limited
The David and Lucile Packard Foundation
Ajinomoto Co., Inc. - Headquarters
Friosur S.A. - Headquarters
Cargill, Incorporated - Global Headquarters
Benihana Inc.
Leardini Pescados Ltda
CJ Corporation  - Group Headquarters
Greenpeace International - The Netherlands | Headquarters
David Suzuki Foundation
Fisheries and Oceans Canada -Communications Branch-
Mitsui & Co.,Ltd - Headquarters
NOREBO Group (former Ocean Trawlers Group)
Natori Co., Ltd.
Carrefour Supermarket - Headquarters
FedEx Corporation - Headquarters
Cooke Inc. - Group Headquarters
AKBM - Aker BioMarine ASA
Seafood Choices Alliance -Headquarter-
Austevoll Seafood ASA
Walmart | Wal-Mart Stores, Inc. (Supermarket) - Headquarters
New Japan Radio Co.Ltd (JRC) -Head Office-
Gulfstream JSC
Marine Stewardship Council - MSC Worldwide Headquarters
Royal Dutch Shell plc (Headquarter)
Genki Sushi Co.,Ltd -Headquarter-
Iceland Pelagic ehf
AXA Assistance Argentina S.A.
Caterpillar Inc. - Headquarters
Tiger Brands Limited
SeaChoice
National Geographic Society
AmazonFresh, LLC - AmazonFresh

Copyright 1995 - 2022 Seafood Media Group Ltd.| All Rights Reserved.   DISCLAIMER