Welcome to FIS   Sponsored By
Subscribe to FIS | Register with FIS | Advertise with FIS | Newsletter | About FIS | Contact us
   


A reef with high coral cover. (Photo: Nick Graham, ARC Centre of Excellence)

Tipping point for coral reef collapse identified

Click on the flag for more information about Australia AUSTRALIA
Wednesday, September 28, 2011, 23:20 (GMT + 9)

An international team of scientists has discovered exactly how many fish can be taken from a coral reef ecosystem before it collapses. This could help save reefs through sustainable management.

The scientists spent 10 years studying the state of coral reefs around nine countries off East Africa and determined how overfishing can produce a predictable sequence of events that result in the collapse of reef ecosystems.

Fishermen setting a net in the coral reef lagoon of Kenya. (Photo: Joshua Cinner)


The findings were published this week in the journal of the US National Academy of Sciences.

Australian scientist Dr Nick Graham, from the ARC Centre of Excellence for Coral Reef Studies of James Cook University, said this is proof that we need marine parks and no-catch zones, ABC reports.

According to the study, in well-protected areas, typically 1,000-1,500 kg of reef fish can be found per ha of coral reef.

As this amount is reduced below 1,000 kg per ha, detectable early warning signs include increased seaweed growth and urchin activity, Graham explained, The Sydney Morning Herald reports.

"You see patches of weeds replacing coral, you see more sea urchins devouring the coral, you see a general decline in the species richness on the reef, and you see less coral cover," he said. “If you carry on fishing and you remove more fish from the reef, you cross a threshold where the predators in the fish assemblage, so the fish that eat other organisms do their job less effectively.”

The maximum sustainable yield (MSY) was found to be between 300 and 600 kg of fish per ha. Graham said that once fish stocks fell below 300 kg/ha, the reef was in real trouble.

Moreover, the loss of hard corals is not a warning sign, as previously thought, but actually the last stage in the collapse of a reef.

 

1) A female fish trader in Kenya. (Photo: Joshua Cinner) /2) A recovering plate coral dominated reef in the central Indian Ocean. (Photo: Nick Graham)



“Further still and we start seeing declines in herbivore and interestingly the very last threshold that we found were collapses in the amount of hard coral cover. So this indicated that a lot of people assume the best indicator of the health of a coral reef is actually the very last sign that a reef is in trouble,” he pointed out.

Related articles:

-
NOAA introduces 'early warning' coral reef observing network to Pacific 

-
Climate change may halve Pacific Islands’ coastal fish catches

By Natalia Real
[email protected]
www.fis.com


 Print


Click to know how to advertise in FIS
MORE NEWS
European Union
Oct 20, 17:10 (GMT + 9):
Baltic Sea fishing: Council agrees on 2021 catch limits
Russian Federation
Oct 20, 08:00 (GMT + 9):
The Federal Agency for Fishery (Rosrybolovstvo) proposed to allocate additional investment quotas for the Far East
Worldwide
Oct 20, 07:50 (GMT + 9):
The keys to making land-based and offshore aquaculture work? Scale, scale, scale
United States
Oct 20, 07:20 (GMT + 9):
Golden king crab could be an emerging fishery at Prince William Sound
Sri Lanka
Oct 20, 06:50 (GMT + 9):
Vietnam to assist Sri Lanka to develop fisheries and aquaculture industry
South Africa
Oct 20, 06:40 (GMT + 9):
Zambia’s Fish Deficit Provides Room For Growth Of Aquaculture Sector – Maj Gen Miti
Russian Federation
Oct 20, 02:00 (GMT + 9):
Russian plans for fishing and processing 300,000 tons of krill
Indonesia
Oct 20, 00:30 (GMT + 9):
Other Media | The Fish Site: Indonesia set for a new shrimp breeding centre
Netherlands
Oct 20, 00:20 (GMT + 9):
Other Media | fishfarmingexpert: Fly farmer crowned most innovative company in Netherlands
United Kingdom
Oct 20, 00:10 (GMT + 9):
Other Media | Fish Farmer: Young’s Seafood owner moves into Europe
Argentina
Oct 20, 00:10 (GMT + 9):
The Oceanographic and Fisheries Research Vessel 'Mar Argentino' joins the INIDEP fleet
Norway
Oct 20, 00:00 (GMT + 9):
Other Media | SeafoodSource: Fish welfare must take higher priority, Salmon Group says
United States
Oct 20, 00:00 (GMT + 9):
Export │ Ocean perch (frozen) │ Volume and prices: Japan, China and Korea (2018-19-20)
United States
Oct 20, 00:00 (GMT + 9):
Export│Frozen Atka Mackerel│Vomunes and prices: Japan, Korea and China | 2018-19-20
South Korea
Oct 19, 20:00 (GMT + 9):
Frozen cod collars, imports 57% from Russia



Lenguaje
FEATURED EVENTS
  
TOP STORIES
Have you ever noticed the age of the fish you are eating?
Japan "How old is this fish?" Have you ever thought about it when you saw it at a supermarket? In everyday life, you rarely know the age of a fish. Regarding the lifespan of creatures living ...
On the shrimp season, the vision of Juan Pablo Basavilbaso from Iberconsa
Argentina Extending two weeks beyond the limit recommended by INIDEP, it comes to an end with few boats in activity and meager yields. A year full of complications, in which the freezer sector was the hardest h...
Fishing will remain the yardstick of the Brexit deal
European Union Another key issue for the fisheries sector is the EU negotiations with the United Kingdom on Brexit, which are at a critical stage as Europe and London should close an agreement on fisheries in the co...
No capelin quota in the Barents Sea in 2021
Norway The capelin stock is well below the limit for the International Council for the Exploration of the Sea (ICES) to recommend a quota. It is the echo sounder registrations on the annual ecosystem cruise...
 
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. - Group Headquarters
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 - 2020 Fish Info & Services Co.Ltd| All Rights Reserved.   DISCLAIMER