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


Pacific cod larvae seen through a microscope.

Scientists analyze Pacific cod response to ocean acidification

Click on the flag for more information about United States UNITED STATES
Friday, February 22, 2019, 23:50 (GMT + 9)

NOAA Fisheries scientists and partners examined larval cod behavior, growth, and lipid composition (the fats needed for storing energy and building muscles), and their study showed that larval Pacific cod response to elevated carbon dioxide (CO2) levels varies depending on its stage of development.

Fisheries scientists Thomas Hurst and a team of scientists from the Alaska Fisheries Science Center, and the College of Earth, Ocean, and Atmospheric Sciences and the Cooperative Institute for Marine Resources Studies at Oregon State University conducted two laboratory studies to evaluate larval fish sensitivity to elevated CO2.

As excess CO2 from the atmosphere dissolves in the ocean, pH is lowered and the ocean increases in acidity, in a process called ocean acidification. Scientists explain this kind of studies is important because most marine fish mortality occurs at the larval stage of development, and the high-latitude oceans where Pacific cod and other important commercial fisheries occur, are expected to be among the most vulnerable to ocean acidification.

Growth rates of larval Pacific cod during the first 5 weeks of life reared on 2 diets at ambient and elevated CO2 levels. Figure is redrawn from data presented in Hurst et al. 2019. Elevated CO2 alters behavior, growth, and lipid composition of Pacific cod larvae. Marine Environmental Research.

Hurst checked the effects of ocean acidification on larval fish early life stages. When Pacific cod larvae hatch, they are less than ¼ inch long and mostly transparent. Headlamps are commonly worn around the laboratory to help researchers see the tiny fish in their dark rearing tanks.

In the ocean, light plays an important role in directing the movements of fish and enabling feeding. The behavioral study showed that when exposed to elevated levels of CO2 four- to five-week-old cod larvae moved more quickly to areas of higher light levels than those raised at CO2 levels currently present in Alaska seawater. While such changes in response to light have been seen in several other fishes exposed to high CO2, scientists are just starting to explore the consequences of these behavioral shifts.

“Changing environmental conditions can impact species in multiple ways and not all life stages may respond in the same way,” said Tom Hurst. “We wanted to explore this because it has implications for the sustainability of Pacific cod and other important fish stocks in Alaska.”

In the second study, scientists looked at larval fish growth rates when exposed to elevated CO2 and fed two different diets, one of which was more lipid-rich (nutritious). Scientists measured fish at two weeks and five weeks old. Regardless of the diet, two-week-old larvae reared at elevated CO2 levels were smaller than larvae reared at current CO2 levels. Interestingly, by five weeks of age, the CO2-exposed fish seemed to have recovered from their slow start.

According to Hurst, the observed differences in growth rates at two weeks vs. five weeks are due to the changing physiology of larvae as they develop. However, it is possible that by the time they reach five weeks old cod larvae are able to acclimate to the effects of elevated CO2.

The scientists also suggest that the fast growth of older larvae may be facilitated by behavior changes that stimulate more aggressive feeding.

This research is part of a larger effort by NOAA to understand the potential consequences of ocean acidification on Alaskan fisheries and the communities that rely on marine resources for nutrition and their economy.

Previous laboratory studies have examined walleye pollock, rock sole and crab species.

AFSC researcher Thomas Hurst checks on larval fish in experiment examining the effects of ocean acidification on early life stages.

“The lack of a consistent response among species to elevated CO2 levels continues to challenge our ability to draw large-scale conclusions about the ecosystem impacts of ongoing ocean acidification. But this research adds one more piece to the puzzle and to furthering that understanding,” said Hurst.

Hurst plans to work with partners at Oregon State University to develop computer models to better predict how ocean acidification may affect Pacific cod and pollock larval survival, recruitment (growth to maturity) and adult fish populations in the Bering Sea over different time scales – that is in 20 to 100 years from now.


editorial@seafood.media
www.seafood.media


 Print


Click to know how to advertise in FIS
MORE NEWS
China
Mar 29, 07:40 (GMT + 9):
Southeast Pacific Squid Index: Giant squid (dosidicus gigas)
Canada
Mar 29, 07:10 (GMT + 9):
Cooke Aquaculture Named One of Atlantic Canada’s Top Employers
France
Mar 29, 07:00 (GMT + 9):
Other Media | The Fishing Daily: French Minister Urges Dialogue Over UK Expansion of Marine Protected Areas
Thailand
Mar 29, 07:00 (GMT + 9):
Thai Union Collaborates to Achieve Zero Wastewater Discharge and Establish an Industry Learning Center
Russian Federation
Mar 29, 07:00 (GMT + 9):
Russia and China Combat Illegal Fishing: Electronic Certificates of Legality for Catches
United Kingdom
Mar 29, 07:00 (GMT + 9):
Brexit costs Scotland up to USD 126.09 million-a-year in lost salmon exports
Japan
Mar 29, 03:00 (GMT + 9):
Driftnet fishing for salmon and trout starts early. Agreement with Russia
Russian Federation
Mar 29, 01:00 (GMT + 9):
Will the Russian Far East be the country with the most snow crabs in 2025?
Viet Nam
Mar 29, 01:00 (GMT + 9):
Shrimp exports from Ecuador are facing many challenges
Australia
Mar 28, 21:10 (GMT + 9):
IN BRIEF - At WTO, Australia seeks details on India's fisheries plan
Croatia
Mar 28, 21:00 (GMT + 9):
IN BRIEF - Cromaris business results in 2023
United States
Mar 28, 07:20 (GMT + 9):
AQUA Cultured Foods Partners with Ginkgo Bioworks to Optimize Alt-Seafood Production
United States
Mar 28, 07:00 (GMT + 9):
Seafood Expo Global Announced Finalists of the 2024 Seafood Excellence Global Awards
Norway
Mar 28, 07:00 (GMT + 9):
Borealis and AKVA group launch groundbreaking Polarcirkel™ workboat hull crafted from renewable feedstock-based plastic
Viet Nam
Mar 28, 07:00 (GMT + 9):
China & HK imported 75 million USD of Vietnamese pangasius



Lenguaje
FEATURED EVENTS
  
TOP STORIES
Clipfish challenges in Brazil: Port bureaucracy stops millions worth
Brazil More and more clipfish containers are being stopped in Brazilian ports. - Complicated regulations make market access challenging, to say the least, say Norwegian exporters who risk large losses. Bra...
Catches in the Sea of Okhotsk and Bering Sea
Russia Fed. Situational update as of 03/24/2024 Source: Stockfile FIS Sea of Okhotsk (pollock) According to OSM data in the Sea of Okhotsk, pollock catch (industrial and coastal fisheries) as of March 24, 20...
Productive Development of the Fishing Activity
Peru Fishing Sector Bulletin - January 2024 The landing of hydrobiological resources registered a negative interannual variation of 62.7%, as a result of the lower landing of fishing resources for indirec...
NGO Sues UK Government Over International Fishing Quotas
United Kingdom Blue Marine Foundation, a charity dedicated to restoring the ocean to health, has launched legal proceedings over the government’s decision to set fishing opportunities, for more than half UK st...
 

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 - 2024 Seafood Media Group Ltd.| All Rights Reserved.   DISCLAIMER